522 PROCEEDINGS OF THE AMERICAN ACADEMY 



Puberulent ; lfts. 5-7, truncate ; bracts short . 45. L. truncalus. 

 b. Lfts. 5-7, ctineate-obovate, sometimes oblanceo- 

 late in 49 ; bracts and petioles short. 



Silky-pubescent ; lfts.. 5 ; Texan . . .46. L. subcarnosus. 



Puberulent ; raceme short, dense ; banner yellow, 

 wings pink ; pod smooth .... 47. L. Stiveri 



Very hirsute, rather stout ; petals 6" long . 48. L. hirsutissimus. 



Low, villous ; petals 3 - 4" long ; lower calyx- 

 lip narrow, rather deeply trifid . . .49. L. concinnus. 



Low, slender, very hairy ; raceme few-flowered, 

 flexuous ; lower lip broad, subentire ; fls. nar- 

 row, 2 - 3" long 50. L. gracilis. 



§ 2. PLATYCARPOS. Fls. as in § Lupinus ; ovules 2 ; cotyledons broad and 

 clasping ; pods ovate ; bracts persistent ; lfts. cuneate-oblong or -obovate after ger- 

 mination ; annuals. 



* Fls. verticillate ; stems tall; racemes long-peduncled. 



t Leaves approximate, long-petioled. 



Villous with long hairs ; fls. mostly purple . . 51 . L. microcarpus. 



Less villous with shorter hairs; calyx nearly 



smooth ; fls. yellow to white . . . . 52. L. densiflorus. 

 t t Leaves scattered ; petioles short. 



Pubescence short, appressed 53. L. Bridgesii. 



* * Fls. scattered ; low or dwarf. 



Very hirsute ; lfts. usually 5 ; racemes nearly sessile ; up- 

 per calyx-lip 2-cleft ........ 54. L. pusillus. 



Nearly acaulescent ; less hairy ; lfts. usually 7 ; peduncles 

 about equalling the leaves ; upper lip very short, trun- 

 cate 55. L. brevicaulis. 



§ 3. LUPINELLUS. Fls. axillary, solitary ; sides of the banner scarcely 

 reflexed ; pod ovate ; ovules 2. 



Annual, dwarf, diffuse, villous ; lfts. 5 ; fls. small . . 56. L. uncialis. 



§ 1. LUPINUS, proper. Flowers in terminal racemes ; banner 

 with its sides strongly reflexed ; ovules several (5 - 12); cotyle- 

 dons petioled, after germination. 



* Herbaceous perennials ; leaflets solitary ; pubescence densely 

 silky; bracts deciduous ; flowers subverticillate. 



1. L, villosus, Willd. Stem stout, decumbent at base or ascend- 

 ing, 1 -.2° high, leafy ; pubescence densely silky-toinentose and villous, 

 especially on the stem and stipules ; stipules 1-2' long, setaceous ; 

 leaves lance-oblong, 2 - 6' long, about equalling the petioles, acute; 

 racemes 6-10' long, often dense, short-peduncled ; bracts about 

 equalling or exceeding the calyx, subulate-setaceous ; pedicels 1 - 2" 



