A New Shrub Species from a Dry Forest of Puerto Rico, Reynosia vivesiana (Rhamnaceae) J. Carlos Trejo-Torres (Cincldaanos dlel Karso, 497 l Emiliano Pol (Box 230), IUrl . Ia C(imlre, San Juan. IPerto Rico00926-5636. Cuirrenti ahddress: SelvaKarst: (oitipaiafa dle Invesligacion para las Selvas Karslicas,Calle 53-1) # 258 x 44 y 46, F'racc. Francisco dle Monteojo, MWriida, Yucatan 97203, Mexico. karsensis@ vahoo.com. mxAHsri.\(:r. Reynosia riresidani Trejo (lhalnraceae) isa previously tunrecoguized species of woody shrub. Itis known froii a d1ry forest in southweslern Puerto(icoli. \wherel i has been recoirdled only in a small lareain the (;llanica Forest IReserve. lThe plll il was trealedfor mIore thain seven decades as R. ,guaina Urblan, arelated species froni the Virgin Islands. The new R.v'ir'siiona is separalted fron R. guinat and the othertwo speclies of Ret osia Griselach from IilPuerto lieo)y its glal1rons twigs. petioles. and slipels. andI iv itssialler ruiils (ca. ) iun long), aimo olliher eatuires.Thie seregatlion of AR. viresianl froni R. gudmaheightlens the importance of both species from aconiservalion slandpoinlt. Rased on IU(CN l'e islcriteria, R. irrcie ria can ill e <ld fi led as (iCiticallyEnlaniglered ((C; ) and cotiiseiienilly needs legalprotecl ion.Rltstl Mw. Rei'cnosia rirc'siani Tr'jo (lRhliainaeeae) esuna especie die arihusto leioso previanetlle nocatalogada. Es conoeida en el )os(Iln sei o delsuriesle de IPuerto Iiio, londle ha sido registrada enini afira peiilliena ( la Ileserva Forestal de (u.nl ica.La planla fue traltada p)or mniis de sicte decadas coneoR. gani(i Uirban, una especie Iherana de las Islas\irgenes. La niieva R. riresiana se distingue de R.,guamrn V de l as otrls dos esp)ecies de ReIynrosiaGrisetbach Ic l Puerto Rico por sls lruml s jivenes,lec(iolos y eslipelas glahlras, asi (lle tono or sils Irltostias pelllenos dle alredeldor de 9 nini de largo, entrotlrs caraelerfsticas. L,a segreglacin de R. riresi(naresp)ecto de R. gunmn realza la iniporlaineia dle aintiaseslpeeies deslde el pnto lie visia de st conservaci(n.(Con base en los eriterios de la Iisla l{oja ide la I C(;NR. riresian pnetlde delfinirse ('o1no en peligro cr'lieco vconsecimente<elle anlerila prolecion legal. Key ordnts: Antilles, IUCN ied I,ist. IPuerlo icoii,Rey'nosia, lliaininacae. ReI'.osia ri'cesiana Trejo (Rlhainnaweae) is apreviously unrecognizedl species of shrubl) known onlyvfromii a lry forest in sotihwvestern Puerto Rico. froun1932-19(). it wags collected at least 13 tlimes in asmallr area itn tie Gina Iica Forest Reserve andlidentified as R. gaiai Utirbant. a species roim theVirgin Islands. In facl. thie ( 1awiing of R. g a.nl in llebook 7Tre.es of 'Pue'rto Rico and the Iirgin .sl7nd.A (Littleet al.. 1974) might actually Ie the new R. rircesiana.Unfortilalelv. the lack of a; herbarium vouchwerrefereince on tllihe drawing preventis the confirrnationof this statement. \r llile stu(lying rare p1lan1 s of thl region in sCeveral herbaria (RM. C. (;1(:) . (:CIQH. F. F (;. (; H. (;()ET, .IBSI), K, I., MAPR, N'Y, P. S.1, UPH, UPl RP, US. \V), I reailized tlat specimeis from Puerto Hicco pIrevioulsly Virgin Islands. To study lhe live plants. I visited wild plopulations in (Giianica (Puerto Rico). St. John (U.S. Virgin Islands), and Virgin G(orda (tBritish Virgin distinguishabl)e by their lplaniil archiltecture, bark. leaves, pubescence, fruits, seeds, and seellings. The several elongaled slets borne al thle veryv base of the tree, arranged in a diffuse, obeonic crown, while /. gticanst, is a siiall Iree or shrub illith a ordinary dense crown. Thlle bark of R. riesieian is smolloth and glacous gray. while that of R. gruai( is vertically furrowed and 1brownish 7gray. 1The leaves of R. liv'lsiina are ti1 ypica lly orlbiutlar and obcordlate, while those of R. giuani are normally oblong and emarginate. In addition, the leaves of R. vivesian, typically IdrI pale brown and rigidly "oriaeouis, while those of R. gucana nornally dry pale gray andl softly suboriaceils. Fruits of A. ri<'esiana arei aliut 0 Ilniiiong while those of R. gumna are up to 17 lim long. Seedlings of R. -i'esicoa auini( R. galItair are distinct from one another, as evidenced ',y seeds in lthie wild and llthose germinated in a greenhouse. The seedlings of R. rirpesi.ni are half thie size and more delicate thian lthlose of R. gmnas. .Leaf shape differences mentioned above are (evyen more nmarked in seedlings and youing plants. In herbarium specimens, Retnasi/ wi'IICesiana issimilar in leaf alppearance and fruit size to R.NoVON 18: 390-394. PIti I.stIttI) ON 2 SitIl�,t:MHt:i 2008.(ei: 10.3417/2005169
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