222 PROCEEDINGS OF THE AMERICAN ACADEMY 



§ 24. Scytocarpi. Legumen coriaceum, ovatum seu oblongum, rarius 

 cylindricum, turgidum, nee antice nee postice sulcatum, sutura 

 neutra introflexa. (Inter se valde diversi.) 



(Here probably A. microlohus, no. 32, might also be sought.) 



* Legumen stipite crasso calycem subasquante sustentum. Flores 

 magni (poUicares), calyee cylindraceo. 



80. A. Preussii, sp. nov. Fere glaber, e radice perenni ? ultra- 

 pedalis ; eaule erecto ; stipulis ovatis discretis ; foliolis 6 - 8-jugis car- 

 nosulis subrotundis quandoque retusis (semipoUicaribus) ; racemis spi- 

 ciformibus brevibus plurifloris ; bracteis ovatis parvis ; dentibus calycis 

 subulatis tubo 3 - 4-plo brevioribus ; corolla ut videtur purpurea, carina 

 subrecta alls paullo breviore, vexillo elongato ; legumine ovali-oblongo 

 recto duriuscule coriaceo inflato (poUicari) glaberrimo apiculato basi 

 subito in stipitem validum contracto. — Banks of the Rio Virgen, a 

 tributary of the Colorado in Nevada, near the eastern borders of Cali- 

 fornia, in loose saline soil. Fremont, in second expedition, 1844. — A 

 well-marked species, named in memory of Fremont's able assistant in 

 all his earlier explorations, Mr. Charles Preuss. The only specimen is 

 preserved in Dr. Torrey's herbarium. A pretty stout, large-flowered 

 species, with firm, leathery, Baptisia-like pods, which are strictly one- 

 celled, Avithout introflexion. 



* * Legumen baud vixve stipitatum. 



-f— Fere acaulescens, argenteo-sericeus, grandiflorus, radice perenni. 



81. A. Cham^leuce, Gray in Bot. Ives' Colorado Exped. p. 10. 

 Phaca pygmcea, Nutt. in Torr. & Gray, Fl. 1, p. 349. Caespitoso- 

 depressus (1 - 2-pollicaris) ; foliolis 2 - 5-jugis obovatis ovalibusque 

 cano-sericeis ; scapis brevibus 3 - 8-floris ; calycis dentibus subulatis 

 tubo cylindrico multoties brevioribus ; corolla albo-violacea (f-polli- 

 cari) ; legumine ovato-oblongo crasso-coriaceo (epicarpio subcarnoso?) 

 tereti subarcuato puberulo (pollicari) . — Upper watei's of the Colorado 

 of the West. 



-I— -I— Humiles e radice annua seu bienni, canescentes, parviflori ; sti- 

 pulis disci'etis. 



82. A. TEPHRODES, Gray, PI. Wright. 2, p. 45. Incano-villosus ; 

 caulibus perbrevibus ; stipulis scariosis triangulari-ovatis ; foliolis 7 — 

 12-jugis oblongis ovalibusque; peduuculis scapiformibus folia demum 

 superantibus spicato-plurifloris ; calycis dentibus tubo campauulato di- 



