(Convolvulaceae) from the Amazonian periphery

18 Pages·2017·1.15 MB·English

KEWBULLETIN(2017)72:10 ISSN:0075-5974(print)
DOI10.1007/S12225-017-9682-9 ISSN:1874-933X(electronic)
Notes on Ipomoea (Convolvulaceae) from the Amazonian periphery
J. R. I. Wood1,2 & R. W. Scotland1
Summary.AttentionisdrawntotherelativelylownumberofIpomoeaspeciesfoundintheAmazonbasinaswellas
totherarityofmostspeciesrestrictedtotheregion.SixnewspeciesfromtheAmazonianperipheryaredescribed:
Ipomoea acrensis J. R. I. Wood & Scotland and I. altoamazonica J. R. I. Wood & Scotland from Brazil and Peru,
I. maranyonensis J. R. I. Wood & Scotland from Peru, I. macarenaensis J. R. I. Wood & Scotland from Colombia,
I.pogonocalyxJ.R.I.Wood&ScotlandfromBrazilandI.deminutaJ.R.I.Wood&ScotlandfromBolivia.Variation
in I. megapotamica is discussed and two subspecies are recognised, subsp. megapotamica from southern South Am-
erica and subsp. velutina J. R. I. Wood & Scotland from northern Brazil and Venezuela. Plants treated as I. cheno-
podiifoliaM.Martens&GaleottifromVenezuelaarerecognisedasI.retropilosa(Pittier)D.F.Austin.Twosubspecies
ofthisspeciesareproposed,subsp.retropilosabeingendemictotheVenezuelanAndeswhereasthenewlydescribed
subsp. cundinamarcana J. R. I. Wood & Scotland is restricted to Colombia. I. austinii Infante-Bet. is treated as a
synonym of the African I. involucrata P. Beauv., one of a number of Old World species now established in the
neotropics.
KeyWords. Amazon, Bolivia, Brazil, Colombia, introductions, Peru, rainforest, taxonomy, variation, Venezuela.
Introduction ofOxford.Theseparticularresultsarebasedmainlyon
Ipomoeaiswidelydistributedintropicalandsubtropical the examination of material from a range of different
Americaandisoftenaconspicuousfeatureofroadsides, herbariavisitedbythefirstauthorduring2013–15when
scrub,forestmargins,swampandsavanna.However,our unidentified material was picked out for further study.
studiesshowthatitislessdiverseintheAmazonianrain Most of this was subsequently sent on loan to Oxford
forest than might be expected. There are a few widely through the collaboration of curators in the different
distributedrainforestspecieswhichoccur.Someofthese institutions listed in the acknowledgements. We have
are relatively frequent, such as I. batatoides Choisy and also made extensive use of a range of images now
I. philomega (Vell.) House, and a few others are quite available on line from different herbaria, especially C,
widespread but uncommon such as I. amazonica (D. F. COL, G, M, P, RB, SI and VEN, in many cases directly
Austin&Staples)J.R.I.Wood&Scotland(Map1)orI. fromthevirtualherbariaoftheindividualherbariabut
eriocalyx (Kuntze) (Mart. ex Choisy) Meisn. However, also through the extensive range of type material
most speciesof Ipomoearecorded from moist forestare availablethroughJstor(www.jstor.org/).Althoughmost
either widespread weedy species of disturbed areas or of thespecimens citedherearerelativelyoldandhave
very localised species endemic to the Amazon basin proved unsuitable for molecular sequencing, we have
oftenbeingknownfromaveryfewspecimensfromone been able to suggest relationships with a degree of
or two locations. Amongst the few species hitherto confidencebasedonourmolecularstudies(Muñozetal.
known from this latter category are I. spruceana Meisn. in prep.) and the obvious morphological characters.
andI.marabaensisD.F.Austin,towhichthispaperadds Species delimitation has inevitably been based almost
another six, all of which demonstrate a very restricted entirely on the morphological characteristics of the
distributionaroundtheperipheryoftheAmazonbasin. specimenswehaveseen.
Materials and Methods Ipomoea amazonica
This publication is one of the fruits of ongoing
monographicstudiesbeingcarriedoutintothegenus Ipomoea amazonica (D. F. Austin & Staples) J. R. I.
IpomoeaattheDepartmentofPlantSciences,University Wood & Scotland (Wood et al. 2015: 27).
Acceptedforpublication7February2017.Publishedonline24March2017
1 DepartmentofPlantSciences,UniversityofOxford,SouthParksRoad,Oxford,OX13RB,UK.
2 RoyalBotanicGardens,Kew,Richmond,Surrey,TW93AB,UK.e-mail:[email protected]
©TheAuthor(s),2017.ThisarticleispublishedwithopenaccessatSpringerlink.com
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Turbina amazonica D. F. Austin & Staples (Austin & C. S. Pessoa, E. Consuelo, I. E. S. Moll, P. Palhares,
Staples 1991: 270). Type: Brazil, Amapá. D. F. AdrianaF.Obermüller,M.Silveira,I.M.Saar&W.Castro
Austin, C. E. Nauman, B. Rabelo, C. Rosario & M. R. 302 (holotype RB).
Santos 7389 (holotype. MG; isotypes FAU, now at
FTG!, NY!, US!). http://www.ipni.org/urn:lsid:ipni.org:names:60473766-2
Calystegia glaziovii Dammer (Dammer 1897: 41), non
Ipomoea glaziovii Dammer (1897), synon. nov. Type: Twining perennial, “liana” (fide Pessoa et al. 302) of
Brazil, Minas Gerais, “près de Queluz, dans la unknownheight;stemsglabrous,somewhatwoody.Leaves
forêt,”Glaziou13009(holotypeB†,photoF,isotypes petiolate,6–16×5–12cm,ovate,shortlyacuminatetoa
K00612827, P03562329). finepoint,cordate,theauriclesroundedoracute,margin
undulate, often irregularly dentate, glabrous, paler
NOTE. This species is the most widespread of those beneath,thinintexture,mainveinsabaxiallyprominent;
endemic to the Amazon basin (Map 1), being found petioles 9.5 – 11 cm, glabrous. Inflorescence of up to
both to the north and to the south of the Amazon 7-flowered, axillary, pedunculate compound cymes, gla-
basinandinBoliviaandColombiaaswellasBrazil.Its brous;peduncles12–15cm,stout,woody;bracteolesnot
distribution strongly suggests that it has been widely seen, caducous; secondary and tertiary peduncles c. 2.5
overlooked andit could beexpected tooccur in Peru cm; pedicels 2.3 – 6.5 cm, conspicuously thickened
and Venezuela and possibly also in Ecuador, Guyana upwards;sepalsslightlyunequal,outer18–22×10– 12
and Guyane Française. It illustrates well the patchy mm, narrowly oblong-elliptic, acute or obtuse, mucro-
knowledge we have of the distribution of most nate,innersepalsveryslightlyshorter,palegreen;corolla
Amazonian species. c.10–11cmlong,glabrous,paleblue,narrowlyfunnel-
The Minas Gerais locality cited for Glaziou 13009 shaped,thetubec.2cmwidefor5–7cm,thenwidened
appears improbable but not impossible. toc.3cm;limb5–6cmdiam.,apparentlylobed.Capsule
andseedsnotseen.Fig.1.
Six localised new species RECOGNITION.ThisspeciesisobviouslyclosetoIpomoea
clavata(G.Don)Oostst.exJ.F.Macbr.andappearsto
Ipomoea acrensis J. R. I. Wood & Scotland, sp. nov. be similar in habit, corolla shape and corolla colour
Type: Brazil, Acre, Mun. de Río Branco, Apa do although we have seen no photographs of living
Ireneu Derra, 9°56'03"S 67°52'08"W, 12 July 2007, plants. However, it differs significantly in being
Map 1. Distribution of Ipomoea amazonica (●). A widely distributed Amazonian species which illustrates the patchy nature of
Amazonianrecords.
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Fig.1.Ipomoeaacrensis.Ahabit;Boutersepal;Cinnersepal;Dfruitingcalyx.AfromPessoaetal.302,B–CfromM.Alexiades&
A.Byrne865,DfromA.Gentryetal.37636.DRAWNBYROSEMARYWISE.
entirely glabrous and lacks the long, white spreading HABITAT & DISTRIBUTION. Upper Amazon region in
hairs so characteristic of the stems of I. clavata. The BrazilandPeru(Map2).Althoughnotclearlyspecified
inflorescence is long pedunculate, the peduncles up by collectors, it isapparentlya plant of disturbed areas
to 15 cm in length, whereas in I. clavata they are only derivedfrommoistlowlandrainforest.
2.5 cm long. Additionally the cymes are up to 7- SPECIMENS EXAMINED. BRAZIL. Acre: Mun. de Rio
flowered whereas in I. clavata the flowers are usually Branco, Apa do Ireneu Serra 9°56'03"S 67°52'08"W,
solitary, rarely up to 3 together. 12July2007,C.S.Pessoaetal.302(holotypeRB).PERU.
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Huanuco:69kmNEofTingoMariaindisturbedroadside Inflorescenceofupto5-floweredaxillarycymes;peduncles
forestonroadtoTocache,Huallagavalley,9°00′S76°W, 1.3 – 5.3 cm, pilose; bracteoles 3 – 11 × 0.5 – 1 mm,
550 m, 16 July 1982, A. Gentry et al. 37636 (FTG, MO). filiform to linear, pilose; secondary peduncles (if pres-
Madre de Dios: Tambopata, in well-lit bamboo forest in ent) 8 – 10 mm; pedicels 22 – 33 mm, pilose; sepals
very moist subtropical forest, confluence of rivers unequal,outer14–17×5–6mm,oblong-ovate,obtuse,
Tambopata and Chuncho, 13°20'S 69°60'W, 400 m, 22 mucronate, abaxially covered in scattered long white
July1989,M.Alexiades&A.Byrne865(NY). hairsmixedwithsoftspines,both3–4mmlong,inner
CONSERVATIONSTATUS.Basedonitsareaofoccupancy sepals 10 – 12 × 4– 5 mm, ovate, mucronate,glabrous
of approximately 12,000 km2, it could be categorised and spineless, margins scarious; corolla 5 cm long,
as Endangered (EN), but with only three records and funnel-shaped, white, glabrous; limb c. 4 cm diam.
anareaofoccurrenceofalmost190,000km2,itshould Capsuleandseedsnotseen.Fig.2.
be treated provisionally as Data Deficient (DD). The
existence of only three widely separated records gives RECOGNITION. This species clearly forms a group of
little indication of its true frequency (Map 2). three species with Ipomoea echinocalyx Meisn. and
ETYMOLOGY. This species is named after Acre State, I. crinicalyx S. Moore. The group is easily recognised
from where the type was collected, itself named after by the fleshy spines that cover most of the surface of
the Río Acre a tributary of the Amazon. the outer sepals but which are absent from other
vegetative parts. All three are clearly closely related
but occupy different geographical areas,
Ipomoea altoamazonica J. R. I. Wood & Scotland, sp. I. altoamazonica being the only species found in
nov. Type: Peru, Cusco, Paucartambo, Chontachaka a Peru and adjacent parts of Amazonian Brazil. It is
Pillahuata, 700 m, P. Nuñez 8087 (holotype MO). immediately distinguished from the other two
species by the 3-lobed leaves (entire in the other
http://www.ipni.org/urn:lsid:ipni.org:names:77160006-1 two species). From I. echinocalyx it is also distin-
guished by the relatively long peduncles (up to 5.3
Twining perennial herb 1 – 2 m high, growing over cm, not < 0.5 cm), which bear up to 5 flowers,
shrubs;stemspilose.Leavespetiolate,7–11×7–9.5cm, rather than a single or (rarely) 2 – 3 flowers. From
3-lobed to half way or slightly less, base cordate with I. crincicalyx it is distinguished by the white (not
rounded auricles, lobes ovate, apex shortly acuminate pink) flowers and the pilose indumentum of the
and mucronate, both surfaces densely pubescent with stem, leaves, peduncles and sepals. I. crinicalyx is
long,somewhatasperoushairs;petioles4–12cm,pilose. glabrous or puberulent.
Map 2. Distribution of six new species from the periphery of the Amazon basin: Ipomoea acrensis (●), I. altoamazonica (▲),
I.maranyonensis(▼),I.macarenensis(✷),I.pogonocalyx(♦),I.deminuta(■).
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Fig.2.Ipomoeaaltoamazonica.Ahabit;Badaxialleafsurface;Cabaxialleafsurface;Doutersepal;Emiddlesepal;Finnersepal.A
fromD.C.Dalyetal.10707;B–CfromD.C.Dalyetal.15012;D–FfromPercyNuñez887.DRAWNBYROSEMARYWISE.
HABITAT&DISTRIBUTION.Aplantoflowlandforestareasendemic Brazil,foundinsecondaryforestwithabundantlight(Shunke
totheupperAmazonwatershedonthebordersofPeruand &Graham15012)andincloudforest(Nuñez8087)(Map2).
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SPECIMENS EXAMINED. BRAZIL. Acre: Marechal sepalsare7–10×5–6mm,thecorolla5–6cmlong
Thaumaturgo, basin of Rio Jurúa, Rio Tejo, left bank, and the capsule 10 – 15 × 6 – 10 mm.
8°59'30S 72°41'28W, 28 April 2001, D. C. Daly et al. HABITAT & DISTRIBUTION. Endemic to “transitional
10707 (ARIZ). PERU. Cusco: Prov. Paucartambo, primary forest” in the Marañon Valley of northern
Chontachaca a Pillahuata, 700 m, 10 May 1987, Peru (Map 2).
P. Nuñez 8087 (holotype MO). Ucayali: Prov. Purús, SPECIMENS EXAMINED. PERU. Amazonas: Prov. Bagua;
8 km debajo del Puerto Esperanza, margen derecho Distr. Imaza, Com. Yamayakat, 5°03'24"S 78°20'17"W,
del Río Purús, 150 – 190 m, 10°12'S 70°57'W, 12 600 m, 6 June 1997, R. Vásquez et al. 23929 (holotype
March 2002, J. Schunke V. & J. G. Graham 15012 FTG; isotype MO); ibid., 4°55"S 78°19"W, 320 m, 24
(ARIZ). Nov. 1993, R. Vasquez et al. 18569 (FTG, MO).
CONSERVATIONSTATUS.Basedonitsareaofoccupancy CONSERVATION STATUS. Based on its very restricted
of approximately 12,000 km2, it could be categorised area of occupancy and extent of occurrence this
as Endangered (EN), but with only three records and species would be assessed as Critically Endangered
anareaofoccurrenceofover32,000km2,itshouldbe (CR). However, in the absence of any detailed
treated provisionally as Data Deficient (DD). The understanding of its ecology or of its frequency in
existence of only three widely separated records gives the two known populations, any formal categorisation
little indication of its true frequency (Map 2). would be premature and it should be categorised as
Data Deficient (DD) until detailed studies can be
carried out.
Ipomoea maranyonensis J. R. I. Wood & Scotland, sp. ETYMOLOGY.ThisspeciesisnamedaftertheRioMarañon
nov.Type:Peru,Amazonas,Prov.Bagua,ImazaDistr., in northern Peru, which forms a deep dry valley rich in
Com. Yamayakat, R. Vásquez, A. Peña & E. Chávez endemicspeciesbeforedisgorgingintotheAmazonbasin.
23929 (holotype FTG; isotype MO).
http://www.ipni.org/urn:lsid:ipni.org:names:60473767-2 Ipomoea macarenaensis J. R. I. Wood & Scotland, sp.
nov. Type: Colombia, Meta, El Mico airstrip, last
Liana of unknown height, apparently glabrous in all savannah before Río Guajar, 6 Nov. 1949, W. R.
parts.Leavespetiolate,5.5–10×7–8cm,3– 5-lobedto Philipson, J. M. Idrobo & A. Fernández 1322 (holotype
nearthebase,the4thand5thlobesoftenonlypartially BM; isotypes MO, US).
developed, lobes oblong-elliptic or lanceolate, 0.5 –
2.5 cm wide, acuminate, base truncate, abaxially paler; http://www.ipni.org/urn:lsid:ipni.org:names:77160012-1
petioles 4 – 6 cm. Inflorescence of compounded axillary
cymes,20–30cmlong;peduncles9–12cmlong;2nd– Climbingperennialherbofunknownheight;stemsdensely
6thdegreepeduncles1–4cm;bracteoles1mm,oblong, pubescenttosubtomentose.Leavespetiolate,2.5–5.5×2.8
scale-like, deciduous; pedicels 7 – 11 mm; sepals – 5 cm, ovate, entire or very shallowly 2 – 3-lobed, apex
subequal, 5 – 7 × 2.5 – 4 mm, elliptic, coriaceous, acute, mucronate, base truncate to shallowly cordate,
concave, outer rounded, minutely mucronate, inner adaxiallygreen,thinlyadpressed-pilose,abaxiallydensely
±scarious, rounded; corolla 4 cm long, pink, funnel- silvery-tomentose with rather long appressed hairs; peti-
shaped,glabrous;limbc.2.5cmdiam.,themidpetaline oles 2 – 3.8 cm, pubescent. Inflorescence of few-flowered
bands ending in teeth; stamens included, longer fila- axillarycymes;peduncles1.2–5cm;bracteoles12–20×1
mentsc.15mm,shorterc.8mm,anthersoblong,3mm – 7 mm, linear to oblanceolate-narrowly elliptic, foliose,
long;style2.3cm,glabrous;stigmabiglobose.Capsule6× variable in size and shape; secondary peduncles 6 mm;
4 mm, ovoid with a slender persistent style, glabrous; pedicels 5 – 6 mm, pubescent; sepals subequal, densely
seeds (possibly immature) 3 × 1.5 mm, pilose with long pilosewithlongspreadinghairs,outer11–14×7–8mm,
whitehairsontheangles.Fig.3. ovate,acuminate,innersimilarbutthemarginsscarious,
glabrous; corolla 5.5 – 6 cm long, funnel-shaped, white
RECOGNITION. This species belongs to the distinctive with pale pink centre, pubescent, limb c. 4 cm diam.,
clade with coriaceous, somewhat concave sepals of entire, longer filaments c. 25 mm, shorter 12 – 14 mm;
which Ipomoea mauritiana Jacq. is the best-known and style15mmlong,glabrous,stigmabiglobose.Capsuleand
mostwidespreadspecies.Ithasindeedbeenidentified seedsnotseen.Fig.4.
asI.mauritianabutisimmediatelydistinguishedbythe
compound axillary inflorescences which reach 30 cm RECOGNITION. This species clearly belongs to the
inlengthandaredivideduptosixtimes.Additionally, radiation of species whose centre of diversity lies in
the sepals, corolla and capsules are all much smaller eastern Paraguay. Like others in the clade the corolla
thaninI.mauritiana.InI.maranyonensisthesepalsare and sepals are hirsute. At COL this species has been
5 – 7 × 2.5 – 4 mm, the corolla c. 4 cm long and the named Ipomoea tuxtlensis House (= I. peteri (Kuntze)
capsule only c. 6 × 4 mm whereas in I. mauritiana the Staples&Govaerts)butdiffersinarangeofcharacters
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Fig.3.Ipomoeamaranyonensis.Ahabit;Boutersepal;Cinnersepal;Dcorollaopenedouttoshowstamens;Eovaryandstyle;F
calyxandcapsule;Gseed.A,F–GfromR.Vazquezetal.18569;B–EfromR.Vazquez23929.DRAWNBYROSEMARYWISE.
including leaf shape and leaf indumentum, the much mm,not6–8mmlong),largercorolla5.5–6cm,not
longer peduncles, the foliose bracteoles and acumi- 4.5 cm in length, and the much laxer, fewer-flowered
nate sepals. It has also been identified as I. sericophylla cymeswithfoliosebracteoles.Itisalsosimilartosubsp.
Meisn. and the two species have a very similar leaf velutina of I. megapotamica but differs in the pilose
indumentum. I. macarenaensis is, however, readily indumentumofthesepalsaswellastheirmuchlarger
distinguished by the much larger sepals (11 – 14 size. It is almost certainly closest to I. opulifolia Rusby
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Fig.4.Ipomoeamacarenaensis.Ahabit;Badaxialleafsurface;Cabaxialleafsurface;Doutersepal;Einnersepal;Fcorollaopenedouttoshow
stamens;Gfruitinginflorescence.A–CfromW.R.Philipsonetal.1322;D–GfromJ.Cuatrecasas7778.DRAWNBYROSEMARYWISE.
buttheleavesareunlobedoronlyshallowlylobedand J. Cuatrecasas 7778 (US01123296, COL000104672); El
the sepals distinctly larger (11 – 14 mm, not 10 – 11 Micoairstrip,lastsavannahbeforeRíoGuajar,450m,6
mm) and with conspicuous spreading, not appressed Nov. 1949, W. R. Philipson, J. M. Idrobo & A. Fernández
hairs.Theoutersepalsareacuminate,notobtuse.The 1322(holotypeBM;isotypesCOL000104674,MO,US).
bracteoles are larger and more persistent than in all CONSERVATION STATUS. Based on its very restricted
these related species. area of occupancy and extent of occurrence this
HABITAT&DISTRIBUTION. EndemictoMetaDepartment species would be assessed as Critically Endangered
in Colombia where it grows at low altitudes in llanos (CR). However, in the absence of any detailed
(grassyplains)belowtheSerraníadeMacarena(Map2). understanding of its ecology or of its frequency in
SPECIMENS EXAMINED. COLOMBIA. Meta: La Serranía the two populations, any formal categorisation would
entre los Ríos Ariari y Meta, 240 m, 19 Nov. 1939, be premature and it should be categorised as Data
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Deficient (DD) until detailed studies can be carried (M. Martens & Galeotti) Hemsl. from Mesoamerica
out. but the larger sepals and pink, funnel-shaped, not
ETYMOLOGY. This species is named after the Serranía white, tubular corolla serve to distinguish the two
de Macarena in eastern Colombia, a mountain range species.
and national park famous for its biodiversity. HABITAT & DISTRIBUTION. Endemic to Maranhão State
NOTE.While thispaper was in proof we have seen two in Brazil, where it is reported from rocky ground in
additional specimens, which may represent another semi-deciduous forest (G. Pereira-Silva & G. A. Moreira
speciesoravarietyofIpomoeamacarenaensis.Theseare 11328) (Map 2).
Lindman 3189 (S) from Santa Cruz da Barra, Mato SPECIMENS EXAMINED. BRAZIL. Maranhão: Mun,
Grosso, Brazil and J. P. Coulleri et al. 166 (CTES) from Tuntum,Palmerinha,74kmdeTuntum,27Feb.1983,
near San Pablo, Marban in the Beni of Bolivia. The J. U. Santos et al. 711 (FTG, K, MG, NY, US); Estreito,
two collections are not quite identical but both 6°35'25"S47°27'21"W, 150 m,8 March2007, G. Pereira-
resemble I. macarenaensis in their spreading Silva&G.A.Moreira11328(CEN).
indumentum and relatively persistent bracteoles but CONSERVATION STATUS. Based on its apparently very
differ in the much smaller sepals and narrower linear restrictedareaofoccupancyandextentofoccurrence
bracteoles. (one of the cited localities is imprecise) this species
would probably be assessed as Critically Endangered
(CR). However, in the absence of any detailed
IpomoeapogonocalyxJ.R.I.Wood&Scotland,sp.nov. understanding of its ecology or of its frequency in
Type: Brazil, Maranhão, Mun. Tuntum, Palmerinha, the two recorded populations, any formal
74 km de Tuntum, 27 Feb. 1983, J. U. Santos, E. L. categorisation would be premature and it should be
Taylor,G.E.Schotz,N.A.Rosa,C.S.Rosário,T.Rebbeck, categorised as Data Deficient (DD) until detailed
J. F. Silva & M. R. Santos 711 (holotype MG; isotypes studies can be carried out.
FTG, K, NY, US). ETYMOLOGY. This species is named pogonocalyx be-
causeoftheprominentspreadinghairsontheabaxial
http://www.ipni.org/urn:lsid:ipni.org:names:77160013-1 surface of the sepals, an unusual feature of species in
the Ipomoea mauritiana clade.
Twining perennial herb to 1.5 m, stem and all vegetative
partshirsutewithratherstiff,whitish,spreadingbulbous-
basedhairs.Leavespetiolate,4–13×3.5–11cm,ovate, Ipomoea deminuta J. R. I. Wood & Scotland, sp. nov.
cordate with rounded auricles, margin entire to slightly Type: Bolivia, Santa Crux, Prov. Velasco, Camp. Flor
undulate, apex abruptly acute, both surfaces hirsute but de Oro, E. Gutiérrez, R. Quevedo & F. Mamani 1152
abaxiallypaler;petioles1.7–7.5cm,hirsute.Inflorescenceof (holotype MO).
axillarypedunculatecymes,usuallywith5flowers;pedun-
cles2.5 –8.5cm, hirsute, appearingsomewhat flexuose; http://www.ipni.org/urn:lsid:ipni.org:names:77160014-1
bracteoles 3 – 4 × 0.5 mm, linear, acuminate, caducous;
secondarypeduncles1.3–2.3cm;pedicelsrelativelylong, Slender twining herb of unknown height; stems pubes-
1.6–3.6cm,slightlymorehirsutethanpeduncles;sepals cent. Leaves petiolate, 1.5 – 2.7 × 0.4 – 1.2 cm,
subequal,12–15×8–9mm,coriaceous,concave,elliptic- lanceolate-deltoid, obtuse to acute, mucronate, base
obovate,outerobtuse,abaxiallyhirsutewhenyoung,but cordate,auriclesvariable,rounded,acute,orrounded
hairs somewhat deciduous on the upper part when old, withaprominenttooth,adaxiallytomentose,abaxially
innersepalsrounded,glabrousexceptforafewhairsnear grey-tomentose;petioles3–7mm,denselypubescent.
base; corolla 6.5 – 7 cm, funnel-shaped, pink, glabrous; Inflorescence of very shortly pedunculate axillary
limbc.3.5cmdiam.;stamensincluded.Capsuleandseeds flowers; peduncles 2 – 3 mm, densely pubescent;
notseen.Fig.5. bracteoles 3 – 4 × 0.5 – 1 mm, filiform, tomentose,
persistent, ±appressed to calyx; pedicels 0 – 1 mm;
RECOGNITION. The coriaceous concave sepals of this sepalssubequal,7–8×1– 1.5mm,lanceolate,acute,
species clearly indicate that it belongs to the same densely pubescent, inner slightly narrower with scari-
group of species as Ipomoea mauritiana and ous glabrous margins; corolla 2 – 2.5 cm long, pale
I. maranyonensis. It is readily distinguished from other pink, funnel-shaped, glabrous, limb c. 1 cm diam.;
species in this group by the long, somewhat stiff, stamens included, stigma biglobose. Capsule and seeds
spreadingbulbous-basedhairsthatcoverallvegetative not seen. Fig. 6.
parts including the outer sepals. The rather long
pedicels suggest an affinity with I. batatoides and also RECOGNITION. This very slender species is quite
perhaps with an undescribed species from the same unlike any other Ipomoea known to us. The small
region represented by Rosa & Santos 2011 (F, FTG, corolla, very small, tomentose, lanceolate-deltoid
MG, NY). There is also a resemblance to I. suaveolens leaves, solitary flowers, short peduncles, persistent
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10 Page10of18 KEWBULLETIN(2017)72:10
Fig.5.Ipomoeapogonocalyx.Ahabit; Babaxialleafsurface;Cinflorescencewithcorolla;Dflowerbud;Eoutersepal,external
(left)andinternal(right)surfaces;Finnersepal,external(left)andinternal(right)surfaces.A,D–FfromJ.U.Santosetal.711;B–
CfromG.Pereira-Silva&G.A.Moreira11328.DRAWNBYROSEMARYWISE.
©TheAuthor(s),2017.ThisarticleispublishedwithopenaccessatSpringerlink.com