Part 2, 1920] FABACEAE: PSORALEAE 131 



ones in the axils; stipules subulate; leaflets mostly 5, linear, involute, 1-1.5 cm. long, 1-2 mm. 

 wide, villous, obtuse; spikes short-peduncled, oblong, dense, in fruit 2-4 cm. long, 10-12 mm. 

 thick ; bracts lanceolate, abruptly acuminate, glabrate at the base, pubescent at the middle, 

 with a filiform less pubescent tip; calyx villous, 3-4 mm. long; lobes lanceolate, acute, shorter 

 than the tube; corolla rose-purple; blade of the banner cordate, 2 cm. long, equaling the claw; 

 blades of the other petals oblong, 3 mm. long; claws 0.5 mm. long; pod obliquely obovate, 3 

 mm. long, pubescent. 



Type locality: .Snowy Mountains, Montana. 

 Distribution: Montana to Texas and New Mexico. 



28. Petalostemon purpureus (Vent.) Rydb. Mem. N. Y. 

 Bot. Gard. 1: 238. 1900. 



Dalea purpurea Vent. Descr. PI. Cels pi. 40. 1801. 



Petalostemon violaceus Michx. Fl. Bor. Am. 2: 50. 1803. 



Dalea violacea Willd. Sp. PI. 3: 1337. 1803. 



Psoralea purpurea Poir. in Lam. Encyc. 5: 694. 1804. 



Kuhnistera violacea Ait.; Steud. Nom. ed. 2. 1: 851. 1840. 



Kuhnistera purpurea MacM. Metasp. Minn. Valley 329. 1S92. 



Petalostemon purpureus f. arenarius F. C. Gates, Torreya 11: 127. 1911. 



A perennial, branched at the woody base; stems 2-9 dm. high, striate, glabrous or spar- 

 ingly pubescent, more or less branched; leaves numerous, 3-5 cm. long, often with fasciculate 

 ones in their axils; stipules subulate; leaflets linear, glabrous or sparingly pubescent, 8-20 mm. 

 long, 1-3 mm. wide, involute; spikes short-peduncled, oblong or cylindric, dense, in fruit 1.5-5 

 cm. long, about 1 cm. thick; bracts oblanceolate, abruptly acuminate, densely pubescent, with 

 a dark almost glabrous subulate tip; calyx silky- villous, 3-4 mm. long; lobes lanceolate, 

 acute, shorter than the tube; corolla rose-purple; blade of the banner cordate, obtuse, 2 mm. 

 long, the claw about 3 mm. long; blades of the other petals oblong, rounded at the apex, 3 mm. 

 long, the claws 1 mm. long; pod obliquely obovate, 3 mm. long, pubescent. 



Type locality: Described from cultivated specimens introduced from Illinois. 



Distribution: Indiana to Saskatchewan. New Mexico, and Texas. 



Illustrations: Vent. Descr. PI. Cels pi. 40; Michx. Fl. Bor. Am. pi. 37, f. 2; Bot. Mag. pi. 1707; 

 Lam. Tab. Encyc. pi. 980; Britt. & Brown, III. Fl. /. 2112; ed. 2. /. 2516; Clements, Rocky Mt. Fl. 

 pi. 27, f. 3. 



29. Petalostemon Standleyanus Rydberg, sp. nov. 



Petalostemon tcnuifolius Wooton & Standley, Contr. U. S. Nat. Herb. 19: 356, in part. 1915. 



A perennial, branched at the base; stems 3-5 dm. high, usually sparingly pubescent; 

 leaves numerous, ascending, 3-5 cm. long; stipules subulate-setaceous; leaflets mostly 5, linear, 

 obtuse, usually involute, 10-15 mm. long, glabrous or sparingly pubescent and conspicuously 

 glandular-dotted beneath; peduncles 2-7 cm. long; spikes oblong, 1-3.5 cm. long, 10-12 mm. 

 thick; bracts oblanceolate or obovate, or the lower lanceolate, abruptly acuminate into a 

 subulate tip, more or less pubescent throughout; calyx silky- villous, 3-4 mm. long; lobes lan- 

 ceolate, acute, shorter than the tube; corolla rose-purple; blade of the banner rounded-cordate, 

 2 mm. long, the claw slightly longer; blades of the other petals oblong, rounded at the apex, 

 more than 2 mm. long; pod densely pubescent. 



Type collected in the Raton Mountains, New Mexico, August 18-19. 1903, David Griffiths 5464 

 (U. S. Nat. Herb. no. 496689). 



Distribution: Northern New Mexico. 



30. Petalostemon Porterianus Small, Fl. SF. U. S. 631, 1332. 

 1903. 



A perennial, with a woody base; stems 2-4 dm. high, more or less branched, sparingly 

 pubescent, striate; leaves ascending, 3-5 cm. long; stipules subulate-setaceous; leaflets 3-5, 

 linear, 8-15 mm. long, strongly involute, sparingly pubescent or glabrous, conspicuously- 

 punctate; spikes oblong-cylindric, in fruit 1.5-4 cm. long, 8 mm. thick; bracts obovate, acumi- 

 nate, pubescent with a dark glabrate tip, longer than the calyces and buds; calyx villous, dis- 

 tinctly 10-ribbed, 4 mm. long; lobes lanceolate or triangular-lanceolate, shorter than the tube; 



