330 University of California Puhiications in Botany [Vol.7 



Polystemma rupestre, sp. iiov. 



Volnl)il(': cimliliiis liii-sutis plus (luam 8 dm. longis: foliis ovatu- 

 acuiiiiiialis. l»asi siiiii ohloiiyo apcrto, su[)ra liirsutulis, subtus ad venas 

 liirsiilis. iis(|uc ad S cm. loiigis, 8.3 cm. latis; petiolis ca. 2.5 cm. longis: 

 cymis ca. 8 cm. loiiuis. pauciHori.s : calyce liirsntis fere ad l)asin 

 iVlobatis. lobis laiiceolalis ca. 8 mm. loiigis, basi ca. 2 mm. latis : corolla 

 cami)aiiidata ca. 2 cm. longa, intus reticulata, alte lobata, lobis laneeo- 

 latis ca. 1 cm. longis; coronae sqiiamis gyiiostegiiim affixis, quorum 

 f) ligulalis pi'orimdc 3-lol)atis erectis. ad utrin(ine latus vel dorsum 

 lobi.s tiliformibus apicc glaudulam parvam gercntibus ct ligulas multo 

 supcrantibus; stigmate verticc piano ; staminura tubo brevi; polliniis 

 iis /'. r/nf////o/-i similibus ; folliculis juvenibu.s longe fusiformibus, 

 Icvibus. 



Collected at Barranca de Panoaya, Vera Cruz, growing on "rocky 

 slopes." No. 8451. Type, Herb. Univ. Calif. 200855. 



Pachystelma gen. nor. Asclepiadacearum 



Calyx alte 5-fidus. Corolla cyathiformis 5-lobata. Coronae 

 squamae 5, partim corollae adnatae, earno.sae, tumidae, apice obtusae. 

 Gynostegium sessile, filamentorum tubo nullo. Pollinia in quoque 

 loculo solitaria fere pendula. Stigma vcrtice depressum, angulis valde 

 prominentibus. Cymae paucifiorae in una axilla pedunculatae. Flores 

 majusculi. 



Pachystelma cordatum, sp. nov. 



Volubile, frutescens : caulibus liirsutis pilis patentibus : foliis ovato- 

 acuminatis basi cordatis sinu aperto, usque ad 7 cm. longis. 5 cm. latis, 

 utriuque paulo breviterque hirsutis: cymis 2-8-ti()ris, pedunculis ca. 

 1cm. longis; calyce alte 5-lobata, lobis ovato-lanceolatis margine 

 ciliatis; corolla usque ad medium 5-lobata, ca. 6 mm. alta, 8 mm. lata; 

 coronae squami.s usque ad medium corollae adnatis, carnosis, crassis, 

 parte inferior! adnata quam parte superiori libera duplo crassa. 

 Folliculi desunt. 



The long stems twining about themselves appear to have been 

 prostrate. The dry cup-shaped corolla is chartaceous and light colored. 

 The scales of the corona slightly surpass the stigma, they are erect, 

 rigid, thick, and about 1 mm. wide, at the apex are somewhat flattened 

 and obtuse ; the lower half adnate to the corolla is very much thickened. 

 The anthers at the angles of the depressed stigmatic part are very 

 prominent. Collected at Acasonica, Vera Cruz. No. 8008. Type, 

 Herb. Univ. Calif. No. 204968. 



