Fourteen New Species of Gonolobus (Apocynaceae, Asclepiadoideae) from Mexico and Central America W 1). StevensMissouri Botanical (arden, P.O. Box 299, St. Louis, Missouri 63166-0299, U.S.A. steveins@nimolbt.orgAsriS\t:t; li. Fourteetn neIw species of the ge'nusGonolobust (Aploctyneae. \Asclepiaotideae) fromMexico and Central America are lescribed and il-lustrated. (;Gonolobs a(sleri.s, G(. harnmelii, G. trun-catifolius. G. tstulatuls. and G. rariabilis are endenm-ic to Costa Kica. (;Gtolobus grultrnii is from (CostaIica ald adjacent t IPanamla adll G. hatidrosltenimm isfrom Costa Rica ard adjacent Nicaragua. Gonolobusalbnforus. G. G. croe.', and G. sandersii are frolnwestern Mexico. Gonlobuhs pallidus is from south-lernl Mexico and G . exalnnulatiis is from southernMexico and Guatemala. Gonolobus anlcori/erus isfound in southeastern Mexico andi HonIduras and (G.cmajaiote is findi in southern Mexico. El Salvador.and Nicaragua.RKSI MN. Se describen t' ilustran catorce ntuevasespecies del generit (<dnolobts (Ap'ocynaceae. As-clepiaditldae) lde Mexico y C(entrtoarniica. (ono0-hlobus asteritas, G. hirnmiin l, G. itruncaiifolius . . us-tulltus, y G. Ivtriabilis son espe'cies endnmicat s ideCosta Iica. Gonolobuts griyumii e's de Costa Ricay Panaman y G. hiadrosterinm es de Costa Rica vNicaragua. Gonohilous albii/lorus. G.roceus. y G.sandersii son tdel oeste tde Mexico. Gonolobus 1pal-lidus es del sur lie Mexico y G. exantitildtu s es elsur ide Mexico v (;uattenaila. Gonolobus atncor/erusse encuenltra en el suretste det Mexico v en lhon-duras y G. mUtajayote se entcentra en el siu-r de Mex-ico, El Salvador y Nicaragua. Key words: Apocynaceae, Aschlepiadmtoidlae, Gonolobhus. Mesoamerica. Mexico. Gonolobus is a getnus of albout 150 species rang-ing from the southern U.S.A. to Argentina and the, Caribtbean, witlh one' slpecies intr loducedi ill westerin tropical Africa. The greatest diversity is centeret' in southern Mexico aind Central Ameriica, where it number of species remain to be described. This contribution contintues the effort (Stevenis & Mion-tiel. 2002. 2004) to account for the known but iun-ldescribed species. n( about half completld. 'To NoVON 15: 222-244. 2005.facilitate the description of individual species, adescription of the genus is provided.Gonololhus Michaux 'Twining (dextrorsurn externe ris.s) herbaceous orwoody \ines. corkv bark absent from wnoodi stems.stemis nearly glabrous to variously pubescent, hairsof uniform length or more often a mixture of longhairs and short and/or short caplitate-glandularhairs. irndumentumn of internodel s uniform or ar-ranged in I or 2 lines beginning between leaf axilsand ending at leaf axils: latex white: roots fibrous.Ieaves oplposite, without pseudtostipules. pettiolate,with colleters at adaxial union of blade alnd petiole.lateral veins pinnate. Inflorescence extra-axillary. 1per node or rarely with a second inflorescenceborne on an axillary short shoot, racelniforni or pan-uliculiforim: calyx divided nearly to base. nornallywith colleters within helow the sinuses: corolla ro-tate, canmpanulate withi a rotate limnh. or occasion-ally tubular, aestivation imbricate and tdextrorse,mostly w ith a faucal aiiulus around corona. hairsof inside of corolla unicellular: androcciurm and gy-nostegium entirely fusedt and fworminlg a gynoste-giumn: coronar gynostelgial, of 5 largely connatelobes, atlnate to base of gynostegium anid to corolla;anthers indistinct, completely adnate to style apex,niormally with a laminar or fleshy apperndage on dis-tal-dorsal margin, terninal appendlages appressedto margin of style apex. guide rails linear. oftenitulistinrt. � vertical or tilted under base of gynos-tegium; pollinaria � horizontal, along anther mar-gin, corpusculunt mosthly sagittate, translator prom-inently translucent-winged, pollinia symmetricallyor nmostly asynitletrically obovoid, rarely cylindri-cal, witll proximal part sterile and � excavated:style apex pentagonal or � star-shaped, shallowlyconcate, smooth or rtugose. Ftollicles I or 2, baseasymmetrical, borne at (,�-180� to pedicel, mostlywitl 5 complete' wings, occasionally with fewer and/or incomplelte wings or rarely without wings. smoothto tuberculate: seeds numerous, bllovae, flat. witha prominenrit margirn cotlose.
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