RUELLIA JIMULCENSIS (ACANTHACEAE), A NEW SPECIES FROM THE CHIHUAHUAN DESERT AREA, MEXICO

4 Pages·1998·1.5 MB·English

by  José A Villarreal Q.

RUELLIAJIMULCENSIS(ACANTHACEAE),
ANEWSPECIESFROMTHECHIHUAHUAN
DESERTAREA,MEXICO
JOSEA.VILLARREALQ.
DepartanientodeBotdnica
UniversidadAutonotnaAgraria"AntonioNarro"
Buenavista,Saltillo,Coahuila23315,MEXICO
ABSTRACT
Rutllicijhiii/lcensisVillarrealsp. nov.,fromtheJimulcomountainsarea(southwestern
CoahuilaandnortheastDurango),isdescribedandillustrated.ItissimilartoR.ocadentalh
(Gray)TharpandBarkley,andrecognizedbyitstelativelysmalletflowers,shortercorolla
basaltubeanditsdistribution.
RESUMEN
Ri/elliiijimulcensisVillarrealsp.nov.delareadelasmontaiiasdeJimulco(suroestede
CoahuilaynorestedeDurango),esdcscritaeilustrada.EssimilaraR.occidmtalh(Gray)
TharpyBarkley,ysereconoceporsusfloresmas]:iequenas,tubobasaldelacorolamas
cortoysudistribucion.
KeyWords:Acanthaceae,Ruellia,Coahuila,FloraofMexico.
Ruellia,atropicalandsubtropicalgenusofabout200speciesisrepre-
sentedintheChihuahuanDesertRegionbysixspecies(Henrickson&Johnston,
inpress).AnewspeciesisproposedaspartofthestudyoftheFloraofCoahuila.
RuelliajimulcensisVillarreal,sp.nov.(Fig.1).Typr,:MEXICO.Coahuila:Mpio.
Torreon,SierradeJimulco,minaSanJose,veredahacialacima,103 1.3'W,25 ()8'N.
MatorralconBonetidlaanomab.Agavekchitgialla.Acaciaherlandien,Flourensia,Hechtia,
SpiraeayAralia,1800-1850m,10Ago1994,/A.VillarrealQ_.1181yM.A.Carranza.
(holotype:MEXU;isotypes:ANSM,ENCB,TEX).
Ruelliaoccidentalh(Gray)Tharp&Barkleysimilisseddiffertfloresplusbrevis,corolla
tubisplusbrevis,calyxlobislongiusquamcorollatubis;florescleistogamousabsenset
differtdistributio.
Perennialherbfromclusteredfibrousroots;stemserecttoascending30-
l5o0ngc;mthteallm,tdeernnsoedleysg4la-n1d0ulcamrpluobnegs;cleenatvewsitwhitshtrpaeitgihotlehsai6r-s3a0bomutm1lomngm,
blades broadlyovate toobovate, 3-10cm long, 2-8cm broad, thebase
obtusetorounded,brieflydecurrentalongthepetiole,apexobtusetoacute,
themarginentiretoundulate-crisped,bothsurfacesviscidwithabundant
glandularhairs,thedriedleavesusuallygreen-yellowish;flowersindicha-
siaandterminalthyrsoidpanicles5-20cmlong,to10cmbroad,strongly
SiDA18(1):223-226.1998
224 SlDA18(1)
Fici. 1.R/icllicijh}]//Iieiisi.s,acompletephmt
ViLLAREALQ.,AnewspeciesofRuellia 225
glandular-pubescent;pedunclesascending;camlymxlobes15—25mmlong,linear
attenuate,unitedattheverybase,1.0—1.2 broadatthebase,unequal,
stronglyglandularpubescent;corollafunnelform,bluish-purple30—40mm
long,thebasaltube8—12mmlong,thebroadlycampanulatethroat 15—
20mmlong,thelobes8—14mm long,almostasbroad,erose;cleistoga-
mousflowersabsent;stamensdidymanous,borneatthedistalportionof
thecorollatube,freefilaments4—10mmlong;anthers3—4mmlong;style
15—20mmlong;fruitellipsoid 12—20mmlong,3—4mmbroad,glandu-
mm
larpubescent;seeds10—12,circulartooblate,2.0—3.0 long,narrowly
wingedtotheapex,brownish,coveredwithdenseapressedtrichomes.
Additionalspecimensexamined:MEXICO.Coahuria:Mpio.deTorrcon,SierradeJimulco,
proximiclaclesaiejidoTrinidad,2508'N,10322'W,MatorraldeAgavelechugiiiUa,Boiiteloua
raniosa,Caesalpiniases5iliflora,JatrophayYucca,laderarocosa,1900—2000m,25Ago1983,
J.A.Villarreal4387,Al.A.CarrairzayA.Rodriguez(ANSM);SierradeJimulco,minaSan
Jose,25"08'N,103"13'W,Matorraldesertico,1800-1850m,11Oct1993,M.A.Carranza
1951yj.Noriega(ANSM);ca.54airkmSSEofTorreonincanyonaboveEstacionOttoin
SWsideotSierradeJimulconearMinaSanJose,inlimestoneareawithAcacia,Celtis,
Viguiera,Parthenium,Jatropha,Trixis,Fo/fq/zieria,Yucca,25 04'N,103 13'W,1850m,12
Sep1980,7,Henrickson&P.BekeyIH5()4(TEX).Durango:Mpio.deCuencame,SierraEl
Rosario,caminoalaestaciondemicroondasSapioris,carr.49,30kmalSEdeLerdo,25
24'N,10343'W,MatorraldeAcaciacrassijol/a,Viguierastenoloha,BurseraKhlendentall,Opuntia
imbncatayFouquieriasplendem,1750-1800m,16Ago1991,J-A.Villarreal6243yM.A.
Carranza(ANSM);EstaciondemicroondasSapioris,ca.30kmSWofGomezPalacioon
HwytoDurango25"24'30"N,103"43'W,matorraldeserticomicrofilo,1400-1500m,
M2i5crMoaornd1a9s73Sa,piMo.rCis.,Jaobhonustto2n,0kT.mL.NWWeriodftE&staF.ciCohniCahnogco1l0at4e0,925("TE2X5');N,ju1s0t3"SS4E3'oWf,Es1t4a5c0o-n
1500m,14Aug1973,M.C.Johnston.T.L.Wendt.FChiang&J.Henrickson12210(TEX);
MicroondasSapioris,alongcobblestoneroadwhichdepartsfromHwy40NofEstacion
Chocolate,ca15airmi(25km)W-SWofTorreon,25"25'N, 103"42'W,Teconiastans.
Agavelechuguilla.Euphorbiaantisyphilitica'Andd'wevscc-Act'i,1300m,30Jul1991,AI.Mayfield,
A.Hempel&A.Jack 1093(TEX);MexicoHwy40,25miSWofLerdo,6nov1964,D.
Flyr251(TEX);Mpio.deLerdo,4misouthwestolChocolate,route31,growingbenerh
PmriosSopWisootnCcliauydafldatLienrvdaollaeyl,on2g3HJuwly194508,toD.ZSa.caCtoercraesl,l&onI.lMi.mJeoshtnosnteonhi2l0ls0i0d8ew(iTtEhX)L;arcrae.a4,
Jatropha,Acacia,Opuntia,Agaveetc.,2'i"3VN,103 32'W,1200m,2ISep1978,/.Henrickson
&E.Lee17474(TEX).
Ruelliaji??iulcensisisfoundonsandyhillsidesanddrycanyonsateleva-
tionsof1200—2()()()m, inxericshrublandsatthecomplexofmountains
nearSierradeJimulcoandSierradelRosario.
Thenewspecieshasleafbladesbroadlyovate,obtusetoroundedatthe
baseasR.occidentalisandoftenwithstronglystipitateglandulartrichomes
coveringthestemsandinflorescence.Itdiffersinitsflowers3—4cmlong,
thebasaltubeofthecorolla8—12mmlong,thecalyxlobeslongerthanthe
basaltube,thecleistogamousflowersunknownanditsdistribution,asmarked
inthekeybelow.TharpandBarkley(1949)gavethenameR. occidentalis
226 SiDA18(1)
WAt.ferrisaetoaspecimenfromthemountainsnearMonterrey,NuevoLeon
whichisrecognizedbyHenricksonandJohnston(inpress)bythisname
forthespecimensdescribedhere.Thetypespecimenfrom theMonterrey
areahasoblong-obovateleafblades,lacksstipitateglandsonstemandleaves
andflowerdimensionsthatbetterfitwithR.nudiflora,acommonspecies
inMonterreyarea.Thepopulationsoftheproposedspeciesgrowallopatri-
callyinanisolatedareaatthesouthwesterncorneroftheChihuahuanDesert
RegionwhilemostoftherelatedspeciesaredistributedintheeasternSi-
erraMadreOriental(Turner1991)-
ThethreespeciesofRuelliapreviously mentionedcanbeseparated by
thefollowingkey:
i.Leafbladesovatetoelliptic-obovate,mostlylessthan3cmwide,sparselyto
moderatelypubescent;lowerinternodespubertilenttoglabrate R.nudiflora
1.Leafbladesbroadlyovatetosubdeltoid,4-7(—9)cmwide,usuallydensely
pubescent;lowerinternodeswithabundantstipitateglands 2
2.Flowers(chasmogamous)4.5-5.5{—6.5)cmlong;basaltubeofthecorolla
2.5—3.5cmlong,longerthanthecalyxlobes;cleistogamousflowers(smaller
thanthechasmogamous)frecuentlylocatedinthelowernodes;seTexas,
neMexico(eCoah,neN.L.,Tamps,neVcr.) R.occiclentalis
2.Flowers3.5—4.0cmlong;basaltubeofthecorollaH—12mmlong,shorter
thanthecalyxlobes;cleistogamousflowersabsent;swCoahuilaandne
Durango R.jimulcensis
ACKNOWLEDGMENTS
IthankTomWendtfortheloanofspecimensforrevisionfromTEX/LL.
TheillustrationwaspreparedbyCuauhtemocGonzalezdeLeon.
REFERENCES
Henrickson,J.andM.C.Johnston,(mpress).AfloraoftheChihuahuanDesertregion.
{Ruellia).LosAngeles,California.2:1151-1155.
Tharp,B.C.andF.Barki.i;y.1949.GenusRtidluiinTexas.Amer.MidlandNat.42:1-86.
Turner,B.L.1991.TexasspeciesoiRi/ellia(Acanthaceae).Phytologia71:281-299.