Part 2, 1920] FABACEAE: PSORALEAE 125 



stipules subulate; leaflets 5-7, linear or linear-oblanceolate, 6-10 mm. long, rarely more than 

 1 mm. wide, involute, glandular-dotted beneath; spikes solitary at the ends of the stems or 

 branches, oblong or those of the branches sometimes subglobose, in fruit dense, 8-10 mm. thick, 

 1-2 cm. long; bracts lanceolate, acuminate, shorter than the calyces, deciduous; calyx 3 mm. 

 long; tube 10-ribbed; lobes triangular-ovate, less than 1 mm. long; corolla white; blade of the 

 banner reniform, 2 mm. long, 3 mm. wide, the claw 3 mm. long; blades of the other petals 

 rectangular-oblong, rounded at the apex, truncate at the base, 3-3.5 mm. long, nearly 2 mm. 

 wide, the claws 1 mm. long; pod obliquely obovoid, 3 mm. long, nearly straight on the back. 



Type collected at Tepehuanes, Durango, June, 1906, Ediv. Palmer 284 (herb. N. Y. Bot. Gard.). 

 Distribution: Durango, Chihuahua, and Texas. 



7. Petalostemon oligophyllus (Torr.) Rydb. Mem. N. Y. 

 Bot. Gard. 1: 237. 1900. 



Petalostemon gracilis oligophyllus Torr. in Emory. Notes Mil. Rec. 139. 184S. 



Petalostemon gracilis A. Gray, Mem. Am. Acad. II. 4: 33. 1849. Not P. gracilis Nutt. 1834. 



Kuhnislera occidentalis A. Heller, Trans. N. Y. Acad. Sci. 14: 33. 1895. 



Petalostemon candidus occidentalis A. Gray; A. Heller, Trans. N. Y. Acad. Sci. 14: 33, as synonym. 



1895. 

 Kuhnislera Candida occidentalis Rydb. Contr. U. S. Nat. Herb. 3: 154. 1895. 

 Kuhnislera oligophylla A. Heller, Bull. Torrey Club 23: 122. 1896. 



A perennial, with a thick woody base; stems several, branched, ascending or decumbent 

 below, glabrous, striate-angled; leaves numerous, 2-5 cm. long, spreading; stipules subulate; 

 leaflets 5-9, firm, linear to elliptic or oblanceolate, 5-20 mm. long, acute or mucronate, con- 

 spicuously glandular-dotted beneath; spikes oblong or rarely globose, becoming looser and 

 cylindric, in fiuit about 8 mm. thick and 1-7 cm. long; bracts lanceolate or ovate, with subulate 

 tip, little if at all exceeding the calyces; calyx 3 mm. long; tube 10-ribbed, glabrous; lobes 

 triangular-lanceolate, 1 mm. long, villous-ciliolate, acute; corolla white; blade of the banner 

 about 2 mm. long and 3 mm. broad, the claw 3 mm. long; blades of the other petals oblong, 

 3 mm. long, the claws 1.5 mm. long; pod obliquely obovoid, somewhat lunate, 3 mm. long. 



Type locality: Valley of Del Norte [near Albuquerque, according to label]. New Mexico. 

 Distribution: Saskatchewan and Montana to western Iowa and Texas; Chihuahua and Dur- 

 ango. 



Illustrations: Britt. & Brown. HI. Fl. /. 2110; ed. 2./. 2514. 



8. Petalostemon Sonorae Rydberg, sp. nov. 



A perennial, woody at the base; stems erect, strict, 3-5 dm. high, striate, branched above; 

 leaves scattered, ascending, 3-5 cm. long; stipules subulate; leaflets 5-7, linear-oblong, 8-15 

 mm. long, 1-3 mm. wide, glabrous, minutely punctate beneath, obtuse; spikes oblong, dense, 

 in fruit 8-10 mm. thick, 1-3 cm. long; bracts lanceolate, caudate-attenuate, with a subulate tip, 

 longer than the calyces and buds, glabrous; calyx about 3 mm. long; tube 10-ribbed, glabrous; 

 lobes less than 1 mm. long, triangular-ovate, acute, minutely ciliolate; corolla white; blade of 

 the banner reniform-cordate, 2 mm. long, 3 mm. broad, the claw 3 mm long; blades of the 

 other petals oblong, 3 mm. long, the claws 1.5 mm. long; pod obliquely obovoid. 



Type collected at Rio de Santa Cruz, Sonora, June 25, 1855, Schott (Mex. Bound. Surv. no. 241, 

 in part; herb. N. Y. Bot. Gard.). 



9. Petalostemon candidus (Willd.) Michx. Fl. Bor. Am. 2: 49. 

 1803. 



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



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



? Petalostemon virgatus Nees & Schw.; Max. Reise N. Am. 2: 432. 1841. 



Kuhnislera Candida Kuntze, Rev. Gen. 192. 1891. 



A perennial, with a woody base; stems 3-10 dm. high, glabrous, striate, with ascending 

 branches; leaves scattered, ascending, 3-5 cm. long; stipules subulate; leaflets 5-9, oblong, 

 linear-oblanceolate, or linear-oblong, 1-3 cm. long, acute, or mucronate, minutely glandu- 

 lar-dotted beneath, acute at the base; spikes dense, oblong to cylindric, in fruit about 

 8 mm. thick, 1.5-10 cm. long; bracts lanceolate, with a long subulate tip, longer than the 



