Begonia kachinensis (Begoniaceae, sect. Sphenanthera), a New Species from Myanmar

2011·0.95 MB·English

by  Tanaka, Nobuyuki

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ISSN1346H7565 AetaPhytotax.Geobot,61(3)]:51-154(2011)

Bagonia kachinensis sect. Sphenanthera),

a New S(pBeecgioen sfiraocme aMey,anmar
NoBuyuKI TANAKA" AND YosHIHIRo HAyAMI
Kbchi Prdecturai imkinoBotanicalGarden,Godaisan4200-a Kbchirs1-812iJmpan.

"[email protected],1ip(ttuthorforcorrespondence)
Begonia kachinensi Nsb. Tanaka (Begoniace aseec,tion SPhenanthe frrao)m ,the Hukaung Valle yTiger
Reserve ,Kachin State n,orthern Myanmar, is illustra tanedd describe das a new to science. Begonia ka-
chinensis is easity distinguished from other species ef Begonia section El))henanther aby a eombination
efthe fo11owin gcharacters; dioeciou shabit b,icolore ldeaves f,iower swith two tepals ,and 4-locular bae-
fruits.
cate
Key words: Begonia, Begonia sect, fi?]henan tBehgeonriaac,eae, Myanmar, new specjes
Field expeditions in cooperation with the For- (Doorenb eot sal. 1998), Other specieswith 4-loc-
est Department, Union of Myanmar Ministry of ular ovaries in section sphenanth earrea B. abo-
Forestry, in 2005 and 2007 to the Hukaung Valley rensis Dunn, B. acetoseUa Craib, B, burkillii
TigerReserve,Kachin State, Myanmar, Dunn, B. handeliiIrmscher,B,hcryamianaNb,
northern
one ofthe larges ntational parks ii lMyanmar and [[lanaka ,B. roxburghii A. DC,, B. silletensis (A.
fioristica ploloyrly known, resulted in the discov- DC.) C.B, Clarke andB. tessaricarpa C.B. Clarke,
ery of a hithert oundescribed species of Bagonia Begonia kaehinensi sis easily distinguis hfreodm
(Begoniace waheic)h, is here named Begonia ka- all of them by the combination of the dioecious
chinensis Nb. Tanaka. The 4-locular baccate habit b,icolore dieaves f, lowers with two perianth
fruit sand anthers with extended connectives segments, and 4-locula braccat efruits.
piace B. kachinensi ,jsn 'section SPhenanthe arna,
exclusively Asian section recognized primarily Begonia kachinensis Nb. Tanaka, sp. nov.-
on the basis of its baccate fruit s(Tleb b2i0t0t3). Figs, 1 &2
Fovuerrth tewrom oyreea,r sb, Ba.s ekda cohni onbesnersvi aastpipeoanrss i tno tbhee dfiioeel-d Eumx steecttrioanleoc oulpahreem nhaabnetnhti eabbru atsomb;nilbiusoru mlsapemciienbiu ssbi covearli-ori-
cious. Both the staminate and pistilla tfeiowers bus ,floribu smaseuljs et femineis tepalis 2 conspicue dif
have only two tepals. Begonia hayamiana Nb. ferL
Tanaka, atso in section E?)henanth weasra a,lso Z)vp uMYsA.NMAR. Kachin State e,ast ofShingbwi-
yangTbwn, 26041'51"N,96"12'27'rE,12February 2007,,l
recently describe dfrom the Hukaung Valley Ti- Mitra ta,IV, Jlanaka,T Kawahara, Adl 7Limura.S .Kbt ki-
ger Reserve (Tanak &a Hughes 2007), skima & N 7lakamt { r 0a4J412 (ho l oMB- K; ise -E, TI).
Begonia, a genus of abeut 1500 species of
herbs ,shrLibs, and climi)ers, mainly in the tropics Plant dioeciou st,errestria la,caulescent, pe-
and subtropics of South America, Africa and rennial, 15-20 em tall. Rhizomes absent. Stenes
Asia (Nguyen 2004), is dMded {nto 63 sections fieshy ,herbaceous ,green or brownish or dark
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152 AelaPhytotaxGeobot, Vol,61

reddish, unbranchcd, usually crccping near base, green, 2.5-15 cm long ,hairy; blade corclate, base
nodes swollen, internodes 2 6 cm long, hairy. strongly asymmetric cordate, margin slightly
Stc'pule spersisten Lgreen ,ovate to lanceolate, toothed, ciliate, apex acute, abaxially green ,rcd-
0.7-1,5 long.O.3 digh
cm cm wide, apex acute, margin purple along margin and m{drib, adaxially
tongfieshyhairs, dark dense
entire, abaxially with somewhat green, along margin and midrib, with
transparenL midrib prerninent abaxially, gta- soft hair son both surfaccs, venation palmate-pin-
brous Leaves bright Ip!f7ore,s'cences
adaxiaHy. atternate; petiole s nate, yeins proininent adaxial]y.
1/ll･il'1'lrielwilw;w/re･'in･nii'･.'\,ii'l,./,/i/l/,iill,E',i.,,ll,f.,,l-.f-･.i,,･i}'k-lpit,-･m-a;,i,i,･.,,,,,,i
.'."!S ....,. .,Zl,/.tY

t
t.,g;
. tttt
stfiii$llilue,･4.l-l
li'#.\i.lgi..,"tt/tt t t ... ttt;tt tttttt
-
za ;./,
.t//iin.g ,e.,k-i},.liil',"'t:.,.'/'tg,' to p.mte,tt/e/
e/.le,.ts..
:x･, . /.-ltt,
ttt

l ''
"".''/ ,".' ,l' t5ttf,'t'h :''?'t

F[G 1 .Begmita A"chmen.sts N'b Tunuka A: SLaminate plant gro",ing in deep shade intrepicut dbrest ,east of Shinb" iyang,
Kachin Statc ,norLhern )vgyanmur ,B: Upper tsurface ol'leafblade. (' rI.o"･e rsuri'ace oi' lcafblade .Di Closeup ofpisullate
fio",e rF.: Ovary Scale bar rcprcsents 3 cm (A C). 1 cm (D) ,5 rrim CE).
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February 20] 1 ktsAKA & HAyAMI--A Nc" Bagonia frorn Myanmar IS3
c
lptnigtft
gn"i$-n ":'efuinXabb)ptLeq
x$'
x
tJe' j}ssi･s" g
ectrt
twlii;r E y<

.,?fl;
te ¢L "t c" "f
vankg kS+"p tt
fib
x .'be.,x
ge･
x
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ee

w
,{sll
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iliii
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B
c 1'i
ig
FIG 2 Begoma kachmenyigNb Tanaka A Habit B CIoscup ofstaminatefiuwer C Stamen D CIoseup ofp]stillateflewer
E Stigina F Ovary m transvcrse section Scale bar represents 3 cm (A) ,1 cm (B ,D), 3 mm (F) 1, mm (C ,E)
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154 ActaPhytotax.Geebot. Vbl,61

axillary, cymose, 1-3-fiowered; peduncte green, name ofthe state, Kachin, in northern Myanmar,
2-2,5 cm long ,hairy ;bract soblong-lanceolate, where the type locali its ylocated.
hairy,1.5 long,
rnargin entire, apex aristate, cm Other ,!pecime nexamined: Kachin State ,wcst of
O.S-O.6 cm wide, persistent .Staminate.flowe r2s Shingbwiyang Town, 26b41'44-57"N 9,6011'13-23" Ea,lt.
or 3, perianth segments 2, free ,vvJhite, ovate to 200-250 m, shaded fbres ftloor ,3 December 2eOS, X geIit-
deltoi d2,-2.5 cm long, 1-- -c2m wide, outer sur- rata, S, Kobayashi, M Hayami & M 71ikashima 04ilZ2
face hairy ,inner surface glabrous ,margin entire; (MBK, TI).
bracteole sabsent; pedice lca. 1 cm long, hairy;
stamens ca. 90, yellow; filament fsree for 3f4 their We thank Pref Tetsuo Koyama for initiati tnhge Myan-
length ,1,5-2 mm long ,fused at base into a short mar-Japanese Coepcrative research prqject .Thanks are
column; anthers 1-2 mm long ,ellipsoid to ellip- Valaslol egyi Tviegn etro RUe sMeryvien,t UMa Tuinng ,T upna,r ekx -wdairrdeecntor of o fH utkhae uNna-g
seid-obovoid, conncctive extcnded into round ture and Wildlif Ceonservatio nDivision a,nd U Soe Win
ap ex. Pistillate wfelro solitary, perianth segments Hlaing, ex-director general, Forest Department, Union ef
2, free ,white, slightly flushe dpink at base ,ovate Myanrnar Ministry of Forestry ,for arranging our fiel rde-
to deltoi d2,.2 cm long ,2 cm wide; bracteol eab- search, to Dr. Mark Hughes fbr reading the manuscript
1 long,hairy; and for his useful comments, and to Ms. Mutsuko Naka-
sent; pedicel cm ovapy green, with jim afor preparin gthe illustrati eTnhsi.s study svas par-
long hairs ,4-locula r4,-winged, tetragonal ,1.5 tially supported by a Grant-in-Aid firo mthe Japancsc
cm leng ,0.8-1 cm wide; plaeentae axilc, bifid; Ministr yef Education ,Culture ,Sport sand Scienc eand
styles 4, shortly fused at base, 5-5.5 mm long, Technelogy to Prof. Jin Murala (17255e0 4a)nd, a Grant-
green ,bifid s;tigma kidney shaped, grccn .Ep'uits in-Aid from the Kochi Prefectural Govcrnment.
indehiscen t1,,5 cm long ,l crn wide, fleshy s,ome-
References
hairy,
what pendulous, glossy green, suborbicu-
lar to rhomboid, somewhat pendulous, without
(wings in fruiO. Doorenbos, J,,M. S.M. S{}sef& J.J.F.F.deWilde.1998.
wings absent mature
Distrihutio n:Northern Myaninar, Known Studie sin Bcgoniacea eVI. The sections ofBegonia
fromKachinState. including dcscriptjons ,keys and species lists .Wa-
only geningen Agrie. Univ, Pap. 98-2: 1-266.
Hahitat & Ecology: [[brrestr iianl d,eep shady Nguyen, Q. H. 2004. A new species of a pc]tatc-leaved
moist conditions in tropica levcrgreen fores tc,a. Begonia (Begonjace afer)om Vietnam. Novon 14:
250 m alt 105-]07.
JUCIV Catego,1> ,:LC (Leas Ctoncern). Al- Tanaka, N. & M, Hughcs. 2e07. Begonia (sec stp.henan-
though this species is known only from the type ntihaer a()B heagyaoinniiaanc N aeibn.a n eoTra)tnhackrna, May iaienwm asprec.i eAsct oaf BPegho-yto-
lecalit yth,e Hukaung Valley Tiger Reserve con- tax. Geobot. 58(2/3) :29-33,
tains considerable extant rainforest between 200 Tebbit tM,. C, 2003. Taxonomy of Begonia tongtfoUa
and 800 m elevation. Blume (Begoniac canadd )related species. Brittonia
Etymology: The specific epithet denotes the 55(1) :19-29.
ReceivedAugusi i9 ,2010; accqptedDecemher Z 20IO
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