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ANEWSPECIESOFMATELEA(APOCYNACEAE: ASCLEPIADOIDEAE)FROMHISPANIOLA AlexanderKrings Herbarium,DepartmentofBotany NorthCarolinaStateUniversity Raleigh,NorthCarolina27695-7612,USA. [email protected] ABSTRACT AnewspeciesofMateleaisdescribedfromfiispaniola,resultingfromstudyofsubtribeGonolobinae (Apocynaceae:Asclepiadoideae)intheWestIndies. RESUMEN SedescribeunaespecienuevadeMatdcadelaEspafiolacomoresultadodelestudiodelasubtribu Gonolobinae(Apocynaceae:Asclepiaoidcae)enlasIndiasOccidentales, In the course of on-going systematic study of subtribe Gonolobinae (Apocynaceae:Asclepiadoideae)intheWestIndies,anewspeciesofMatelea Aubl.wasdiscoveredfromHispamola: MateleapentactinaKrings,sp.nov.(Fig.1,A-B,E).Type:HAITI:LesRoseaux,Massifde laHottewesterngroup,rockyledge,ca.1300m,16Sep1928,EkmanH10685(holotype:S!). SpeciesnovadistinguibiliaMateleaiantnijoUa(Gnseb)Woodsonloliobasirotundata,noncordata velauriculata,aMateleaconstanzanajimene?COroi/flVIn(iisvel/lavc!,lobisiUrinqueretii:ulato-ve?iosis, superncpuherulis,etaMaleleaovatijolia(Gnseb.)Woodsoncorollatrichomata0.11mmlonga,co- ronasegmentiserectisovatis,(1.5-)f.7-1.9mm,viaantheram0.5-0.6mm. Twiningvine;stemsherbaceouswhenyoung,becomingwoodywithage,the barl<cream-colored,somewhatcorky;stemspubescentinlines,thetrichomes mm white,multi-cellular,retrorselycurvedorsometimesstraight,to0.2 long; leavesopposite,simple,thebladesovatetoelliptic,(6.5-)12.7-21mmx(2.6- )6.8-I3.6mm,bothsurfacesglabrousorglabrate,theapicesobtusetonarrowly rounded,apiculate,theapiculumto1.2mmlong,thebasesroundedthemar- ginsentire,glabrousorciliolate,thecihaca.0.08mmlong,colleters2,yellowto orange,borneadaxiallyonthemidveinatthebaseoftheblade,to0.2mmlong, petioles2.9-9.4mmlong,groovedadaxially,glabrousexceptforthegroove,tri- chomesmostlyantrorse,to0.18mmlong;inflorescenceaxillary,umbelhform, thepedunclesseverelyreducedtoobsolete,pedicels5-12mmlong,puberulous withtrichomesto0.12mmlongorglabrate;sepals5,ovatetolanceolate,ca.1 mmlong,theapicesroundedtoobtuse,bothsurfacesglabrous,themargins glabrousorverysparselyciliolate;corollarotate,palegreenoryellowwithdark mm greenreticulations,5-lobed,thelobesovate,to4,2 long,theadaxialsurface SIDA21(3):1519-1523.2005 1520 BRIT.ORG/SIDA21(3) Fig.1.MateleasubgenusPoicilla:A-B&tMateleapentactinaKrings{EkmanHW685,S);C-i.,Mateleaovatifolia(Griseb.; Woodson{Wright2965,GH);F,Mateleatamnifolia(Griseb.)Woodson(Wrights.n.,GH).Agr=Antherguiderail;Co= Corpusculum;Cs=erectstaminalcoronasegment;Gy=Gynostegium;Lf=leaf. KRINGS,ANEWSPECIESOFMATELEAFROMHISPANIOLA 1521 pubescentnearthebaseofthelobes,thetrichomeswhitishto0.11 mmlong, theabaxialsurfaceglabrous;faucalannulus[Ca]pubescent;coronaofIused staminalandinterstaminalparts[C(is)],glabrous,thestaminalsegments[Cs] erect,foliate,ovate(1.5-)1.7-b9mmlong,theapicesobtuse,deeplynotched, higherthantheapexofthegynostegium;gynostegiumstipitate,thestipeca. 0.2mm long;dorsalantherappendages[Cd]lacking;antherguiderailsout- wardlypronounced,0.5-0.6mmlong;poUinariadescending;folliclesunknown. Etymology.—Theepithetpcniactinareferstothefive,elongate,outwardly projectingantherguiderails,reminiscentotrays. Additionalspecimensexamined:Haiti:MassildolaSellc.gr.C;rete-a-Piquants.Port-au-Prmcc,be- tweenCarrelour-MartinandBoisd'Ormc,c.800m.limestone,17Decmib,HhmanH7402(S!). Matdeapentactina ismostclosely related to Matclcaovatifolia CGriseb.) Woodson(Fig.1,C-E)andbothitsholotypeandparatypehavepreviouslybeen referredtothebetter(seeLiogier1981).Vegetativelythetwospeciesareexceed- inglysimilarandmaynotbeconclusivelydistinguished.However,anumber offloralcharacterstatesdistinctlyseparatethem(seeTable1andkeybelow). MateleaovatifoliaappearsendemictoCubaandM.pentactinatoHispaniola, althoughthesinglespecimenseenfromtheDominicanRepublic(Fucrtcs991, GH)issterileandthuscannotbeconclusivelyreferredtoeitherbasedonmor- phologyAhandwrittennotewiththeholotypeofM.pcntaciina^presumably byEkman,indicatesitwas"seenoccassionalythroughoutsouthernHaiti(at least),althoughseldomwithfirs'"Asimilarnoteontheparatypereads:"i^are, althoughIthinkIhaveseenitsterilebeforeandtakenitlorsomeMctastclma [sic]."MatekapentactinaalsoappearscloselyrelatedtotheHispamolanMatelea constanzcinaJimenez(nom.novforPoicillopsistuerckheimiiSchltr.astheepi- thetisnotavailablemMatelea).Thislatterspecieswasapparentlyknownonly fromthetype(Sto.DomingopropeConstanza,Tuerckheim3466,Jul1910;see alsoLiogier1981)andappearstonolongerbeextant.Theprotologueindicated thatM.constanzanaalsobearsobtusestaminalcoronasegments,butexhibits glabrouswhiteflowers.Thestrikingreticulationsevidentinthepubescent, greenoryellow-floweredM.pentactinawerenotdescribedforM.constanzana. Accordingtothesubgenericclassificationerected byWoodson(1941), MateleapentactinaandM.ovatifolia,aswellasM.tamnifolia(Griseb.)Woodson (endemictoCuba;Fig.1,F),belongtotheentirelyAntilleansubgenusPoicilla. Woodson(1941)didnotincludetheentitynowknownasM.constanzanainhis treatment,butitsaffinitieswouldseemtoplaceitinhissubg.Poicillaaswell AlthoughmanyofWoodson's(1941)subgeneraarelikelyill-conceived(Stevens 1988),subgenusPoicillaismaintainedheremtheabsenceofarigoroustestof Woodson's(1941)concept.Akeytothesubgenusisprovidedbelow.On-going systematicstudyofWest IndianGonolobinaeaimstoimprovegenericand subgenericcircumscriptions. 1522 BRIT.ORG/SIDA21(3) Table1,FloralmorphologicalcharactersdistinguishingMateleapentactlnafromtherelatedM. ovatifolia(Apocynaceae:Asclepiadoideae). Character Mateleapentactina Mateleaovatifolia AEdreacxtiasltacomrionlallacsourrofnacaestergimcehnomtessrC{s)l t(o1.0.51-)11m.7m-ll,o9nmgmlong, 00..9193--10..2280mmmmlloonngg, ovate,theapices obovatetosuborbicu- obtuse lar,theapicesrounded toemarginated Antherguiderails 0.-S-0.6mmlong to0.26mmlong KEYTOMATELEASUBGHNUSPOICU.LA 1. Leafbladeslanceolate,thebasescordatetoauriculate Mateleatamnifolia 1. Leafbladesovate,thebasesroundedtotruncate(veryrarelyshallowlycordate). 2. Vineexhibitingthecombinationofcorollalobeswhite,glabrousonbothsur- faces,notreticulate,andstaminalcoronasegmentsrhombic,obtuse Matelea constanzana 2. Vinenotexhibitingtheabovecombinationofcharacters(i.e.,ifcorollalobes white,thencoronasegrmentsobovatetosuborbicular,theapicesroundedto emarginateORifcoronasegmentsobtuse,thencorollasgreentoyellow, reticulate) 3. Adaxialcorollapubescence0.13-0.2mmlong;erectstaminalcoronaseg- ments0.99-1.28mmlong,obovatetosuborbicular,theapicesroundedto emarginate;antherguiderailsto0,26mtiilong Mateleaovatifolia 3. A(1d.a5x-i)a1l.7c-o1r.o9llmampubloensgc,eonvactee,toth0e.1a1pimcmesloobntgu;seer;eacnttshtearmginuaildecorariolsna0.s5-e0g,m6emntms long Mateleapentactina ACKNOWLI-DGMENTS Ithankthecuratorsandstaffofthefollowingherbariaforaccesstotheircol- lectionsorloansofspecimens:BH,BM,BOLO,BREM,C,CGE,DUKE,E,EEl,ER, FTG,G,GH,GOETH,EIAC,HAJB,HBG,Ij,JE,K,M,MICH,MIN,MO,NY,O, OXF,P,PH,RSA,S,U,UC,US,USEWU,Z.Ialsothankthecui-atorsandstaffof the followingherbaria forsearching theircollections for West Indian Gonolobinaematerial,althoughfindingnorepresentation:BG,BKL,BR,BUE COLO,CR,ELAS,IA,LSC,LD,MSU,NHU,NSW,UPS,TUR.Thethoughtfulre- viewofapreviousversionofthemanuscriptbyMaryE.Endress,AlainLiogier, andPaulEantzisgratefullyacknowledged. 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