104 PROCEEDINGS OF THE AMEEICAN ACADEMY 



The slender horns moderately surpass the subulate-attenuate anterior 

 lobes of the hoods. The follicle in the only fruiting specimen is erect 

 on a circinnate pedicel. 



AsCLEPiAS PDBERULA. Subglabra, spitharaaea ; foliis oppositis 

 lanceolatis (infimis nunc oblongo-lanceolatis) seu linearibus, 1^3-pol- 

 licaribus sat petiolatis ; pedunculis umbella plurifloro longioribus ; 

 corollge albidae lobis lato-ovatis supra puberis ; columna brevissima ; 

 cucullis ovatis obtusissimis crassis stigma parum superantibus processu 

 suo lingulato obtusissimo prorsus adnato vix longioribus. — In swamps, 

 Morales, near San Luis Potosi, SchafFner. 



AsCLEPiAS EUPHORBiJEFOLiA. Engelm. in herb. Humifusa, a basi 

 ramosa, fere glabra ; foliis omnibus oppositis parvis (lin. 2-3 longis) 

 ovatis subcordatis raro oblongis subcarnosis eveniis breviter petio- 

 latis ; pedunculis terminalibus umbelliE 7-9-floraB lEquilongis ; floribus 

 roseo-albidis (lin. 2 longis) ; columna brevissima ; cucullis ovato- 

 oblongis obtusis basi marginibus inflexis corollas lobis parum aequi- 

 longis infra medium processu falcato brevi incluso auctis ; folliculis 

 puberulis laevibus in pedicello arrecto-inflexis. — Near San Luis 

 Potosi, in sandy soil, Schaffner (1876), Parry and Palmer, the latter 

 in a single specimen. 



III. A New Genus of Gentianacece. 

 GENIOSTEMON, Engelm. & Gray. 



Calyx alte 4-fidus ; lobis lanceolatis carinatis subulato-acutis. 

 Corolla marcescenti-persistens, subrotata ; tubo lobis ovalibus baud 

 longiore. Stamina 4, fauci inserta: filamenta antheris oblongis im- 

 mutatis sequilonga, glanduloso-barbata. Stylus elongatus, filiformis, 

 persistens : stigma infundibuliformi-capitatum, subintegrum. Cap- 

 sula oblonga, placentis intrusis semibilocularis, polysperma. Semina 

 subglobosa ; testa conformis parum foveolata. — Hei'bae Mexicanae, 

 annujE? pusilliK (bipollicares), ramosae, parvifoliae ; floribus peduncu- 

 latis cterulescentibus. Eryihrece et Microcalce atiinis. 



Geniostemon Coulteri. Caulibus teneribus parum ramosis aequa- 

 liter foliatis ; ramis unifloris ; foliis spathulato-lanceolatis (lin. 3 longis) 

 basi attenuatis ; pedunculo flore baud longiore ; filamentis infra 

 medium creberrime glanduloso-barbatis ; antherse loculis utrinque 

 obtusis (corolla lin. A longa, ut videtur alba?). — Mexico, Coulter, 

 no. 945. 



Geniostemon Schaffneri. E radice forte annua multicaulis, 

 cymoso-ramosissimus et multiflorus ; foliis linearibus (lin. 2-3 longis) 



