130 NORTH AMERICAN FLORA (Volume 24 



pedicels 1 mm. long or less; calyx strigose, about 2 mm. long; lobes purplish, acute, slightly 

 shorter than the tube; corolla light rose-color or whitish; blade of the banner reniform, 1 mm. 

 long, 1.5 mm. wide, the claw 1 mm. long; blades of the other petals obliquely rounded-obovate, 

 1.5 mm. long, with a very short claw; pod with conspicuous glands, sparingly pubescent. 



Type locality: San Ignacio, Lower California. 



Distribution: Known only from the type locality. 



24. Petalostemon obreniformis Rydberg, sp. nov. 



An annual, branched at the base; stems about 3 dm. high, glabrous, terete, branched; 

 leaves ascending, 2-4 cm. long; stipules subulate-setaceous, 3-4 mm. long; rachis scarcely 

 margined; leaflets 9-13, elliptic, 6-10 mm. long, glabrous, paler beneath; peduncles 1-7 cm. 

 long; spikes slender, 1-4 cm. long, about 5 mm. thick; bracts inverted-reniform, apiculate, 

 dark, with white or light margins, glabrous, conspicuously glandular-dotted; calyx about 2.5 

 mm. long, silky-pubescent; lobes ovate, acute, 0.75 mm. long; corolla dark-blue; blade of the 

 banner suborbicular, truncate at the base, 1 mm. long, fully 1.5 mm. wide, the claw 2 mm. long; 

 pod hairy above. 



Type collected at the base of Mt. Mohinora, Chihuahua, 8 miles from Guadalupe y Calvo, 

 August, 1898, E. W. Nelson (U. S. Nat. Herb. no. 332883). 



25. Petalostemon griseus T. & G. Fl. N. Am. 1: 310. 1838. 



Kuhnistcra grisea Kuntze, Rev. Gen. 192. 1891. 



A perennial; stem 2-7 dm. high, usually erect, often reddish, striate, sparingly pilose, 

 branched above; leaves numerous, 3-4 cm. long, spreading; stipules subulate; leaflets 

 9-17, oblong, oblanceolate, or linear-oblong, 6-12 mm. long, mucronate, finely long-pilose, 

 conspicuously glandular-dotted beneath; spikes many, very short-peduncled, cylindric, in 

 fruit 2.5-6 cm. long, 6-7 mm. thick; bracts deciduous, linear-lanceolate, caudate-attenuate, 

 longer than the calyces, pubescent; calyx 10-ribbed, densely pubescent, 3 mm. long; lobes 

 lanceolate or triangular-lanceolate, acute, a little shorter than the tube; corolla pink or pink- 

 purple; blade of the banner cordate, 2 mm. long and as broad, equaling the claw; blades of 

 the other petals oblong, 2 mm. long, the claws scarcely 0.5 mm. long; pod 2 mm. long, obliquely 

 obovoid, pubescent. 



Type locality: Pine woods near the Sabine River, Texas. 

 Distribution: Texas. 



26. Petalostemon villosus Nutt. Gen. 2: S5. 1818. 



Dalea rillosa Spreng. Syst. 3: 326. 1826. 

 Kuhnistcra villosa Kuntze, Rev. Gen. 192. 1891. 



A perennial, with a woody tap-root and caudex, branched at the base, bushy; stems 

 ascending or decumbent, 3-6 dm. high, densely villous; leaves very numerous and crowded, 

 3-5 cm. long, often with fasciculate ones in their axils; stipules subulate; leaflets 9-17, approxi- 

 mate, oblong or oblanceolate, acute or obtuse, 5-10 mm. long, 2-4 mm. wide, densely villous; 

 spikes terminating the branches, usually subsessile, .sometimes clustered, cylindric, in 

 fruit 8 mm. thick, 2-10 cm. long, dense; bracts lanceolate, caudate-attenuate, longer than the 

 calyces, deciduous, villous; calyx about 3 mm. long, densely villous, 10-ribbed; lobes lanceolate, 

 acute, shorter than the tube; corollas rose-purple, rarely white; blade of the banner cordate, 

 2 mm. long and as broad, the claw 2.5 mm. long; blades of the other petals elliptic, 2.5 mm. 

 long, the claws 0.5 mm. long; pod obliquely obovate, somewhat lunate, 3 mm. long, villous. 



Type locality: Banks of Knife River, near Fort Mandan, North Dakota. 



Distribution: Michigan to Missouri. Texas. Montana, and Saskatchewan. 



Illustrations: Britt. & Brown, 111. Fl./. 2115; ed. 2./. 2519. 



27. Petalostemon mollis Rydb. Mem. N. Y. Bot. Gard. 1 : 238. 

 1900. 



Petalostemon purpureus mollis A. Nelson; Coult. & Nels. Man. 299. 1909. 



A perennial, with a woody tap-root, branched at the woody base; stems 2-5 dm. high, 

 villous, striate, simple or branched above; leaves spreading, 2-4 cm. long, often with fasciculate 



