APPENDIX. 439 



oemes short or subcapitate, many-flowered ; flowers 5-6" long, violet or whitish, wings little if at all 

 exceeding the rather large keel ; pod oblong, straight or recurved, blaok-villons or -pubescent, triangu- 

 lar-turgid, the suture intruded to the middle or beyond, stipe usually exceeding the calyx.— Arctic Amer- 

 ica ; Labrador ; Maine and Vermont ; Wyoming and Colorado. 



46. A. SPAESIFLORUS, Gray. Slightly appressed-pilose, glabrate ; stems very slender, branched, dif- 

 fuse; stipules triangular-subulate, distinct ; leaflets 4-6 pairs, obovate or subrounded, often emarginate, 

 2-3" long; peduncles scarcely exceeding the leaves, 3-10-flowered ; flowers 3" long, bluish-white, the 

 emarginate or bifid banner and the wings much exceeding the incurved keel ; calyx-teeth equaling the 

 tube ; ovary 8-12-ovuled, short-stipitate ; pod 3-6" long, coriaceous, oblong, incurved, pubescent with 

 short hairs, mottled, 2-oelled to the middle, very short-stipitate, ventral suture acute.— Colorado. 



* * Californian, annual, low, erect; flowers few, capitate; wings and banner much exceeding the 

 keel ; ovary silky-canescent, sessile ; pod unknown. 



47. A. Brewbri, Gray. About a span high, with very short black and whitish hairs; leaflets 4-5 

 pairs, oblong-obcordate ; stipules small, ovate, scarious ; immature pods globose-ovate, erect, crowded, 

 6-ovuled, twice longer than the calyx, dorsal suture slightly intruded. 



* * ' Southern and eastern species; racemes spikelike, most iisually short; calyx never black-hairy; 

 pod glabrous, reticulated, sessile or scarcely stipitate, oblong, incurved. 



48. A. LiNDHBiMBRi, Eug. Annual, many-stemmed, diffuse, glabrous ; leaflets 6-8 pairs, narrow- 

 oblong, mostly emarginate ; raceme subcapitate ; calyx-teeth subulate-setaceous, about twice longer than 

 the tube ; corolla violet, i' long ; keel rather large, little shorter than the wings and broad scarcely 

 emarginate banner ; pod ascending, upon a spreading pedicel, oblong-linear, 1' long or more, subfalcate, 

 compressed, transversely reticulate-veined, substipitate, bicarinate on the back and 2-celled to the mid- 

 dle, ventral suture acute. — Texas. 



49. A. DISTORTUS, T. & G. Perennial, low, diffuse, many-stemmed, subglabrous; leaflets 8-12 pairs, 

 oblong, emarginate ; flowers in a short spike, i" long, narrow, pale-purple ; calyx-teeth broad-subulate, 

 half-shorter than the dark-puberulent tube ; banner deeply emarginate ; pods 6-9" long, ovate- or lance- 

 oblong, arched, thick-coriaceous, minutely reticulated, subterete, 1-oelled, sulcate at the sutures, espe- 

 cially on the back. — S. Illinois, Arkansas and Texas. 



50. A. OBCORDATUS, Ell. Perennial, low, diffuse; leaflets 7-12 pairs, obcordate; flowers pale-purple, 

 4" long ; pods 1' long, lunate, sulcate dorsally, ventral suture acute. — Florida, Georgia. 



51. A. GLABBR, Mx. Perennial, tall, erect ; leaflets 9-18 pairs, elliptic- or linear-oblong ; flowers 6'' 

 long, white ; pods oblong-linear, 1' long, arcuate or straightish, sulcate on the back and 2-oelled to the 

 middle, ventral suture prominent. — ^N. Carolina to Florida. 



§ 15. LOTIFLOEI. Perennial and nearly like the last division of § Oroboidei, but villous or ca- 

 , nescent, lower, and with yellowish flowers ; pod semi-ovate or oblong, turgid, coriaceous, subtrian- 

 gular, with the back gibbous and more or less impressed, the ventral suture prominent'; corolla 

 little exceeding the calyx, the keel inflexed above ; calyx-teeth exceeding the tube. 



52. A. VILLOSUS, Mx. Loosely villous ; stems a span high, ascending ; leaflets oval, retuse ; heads 

 many-flowered, long-peduncled ; corolla 4" long ; pod very villous, 2-ceUed nearly to the middle, cross- 

 section obcordate. — S. Carolina to Florida and Louisiana. 



53. A. LOTLFLORUS, Hook. Hoary or cinereous with appressed hairs; stems very short; leaflets 

 lance-oblong; peduncles exceeding the leaves or very short ; heads few-flowered; calyx-teeth subulate, 

 exceeding the tribe; pod about 1' long, oblong-ovate, more inflated, subcanescent, the cross-section obo- 

 vate, retuse, or usually broadly obcordate toward the base. — From Texas and Nebraska to the Eocky Mts. 

 and Hudson's Bay. 



§ 15°. (PTEEOCAEPI.) Pod sessile, coriaceous, oval, 1' long or more, strongly obcompressed and 

 laterally winged, acute and compressed at the apex, glabrous, transversely rugose-veined, slightly 

 sulcate, the dorsal suture nearly meeting the subdepressed ventral one. Perennial. 



54. A. PTBROCARPUS, S. Watson. See page 71, and Plate XII. 



§ 16. AE60PHYLLI. Pod sessile, (except in A. BeckwUMi,) mostly thick-coriaceous and obcom- 

 pressed, the impressed or intruded dorsal suture more or less approaching the ventral, not 2-celled, 

 pubescent. Low, white-silky or hoary ; stipules distinct, nearly free; flowers spicate or subcapi- 

 tate, violet or purplish; calyx-teeth shorter than the usually oblong or cylindric tube. 



* Annual or biennial, many-stemmed ; flowers rather small, purplish-white ; pod inflated, membra- 

 nous, incurved. 



55. A. PUBENTissiMUS, T. & G. Dwarf, hirsute-oanescent with a loose pubescence ; leaflets oblong 

 or obovate; flowers few, subracemose upon a short peduncle; calyx-teeth equaling the campanulate 



