128 NORTH AMERICAN FLORA [Volume 24 



16. Petalostemon pilulosus Rydberg, sp. nov. 



A perennial; stem 4—5 dm. high, terete, finely short-pilose, tinged with red or brown, 

 branched; leaves 2-4 cm. long, spreading; stipules subulate, 1 mm. long; rachis not margined, 

 finely pilose; leaflets 15-19, elliptic, sparingly and finely pilose on both sides, bright-green 

 above, glandular-dotted beneath; peduncles 2-5 cm. long; spikes dense, 2-3 cm. long, about 

 6 mm. thick; bracts lanceolate, attenuate into a subulate tip, longer than the calyces, pubes- 

 cent; calyx densely silky, 4 mm. long; lobes lance-subulate, attenuate, equaling the tube; 

 corolla white; blade of the banner elliptic, about 2 mm. long, the claw nearly as long; blades of 

 the other petals oblanceolate, 2 mm. long, the claws about 0.5 mm. long; pod silky-pubescent 

 above. 



Type collected in Arizona, 1891, Nealley 237 (herb. N. Y. Bot. Gard.). 



17. Petalostemon compactus (Spreng.) Swezey, Neb. 

 Fl. PI. 6. 1891. 



Dalea compacta Spreng. Syst. 3: 327. 1826. 



Petalostemon macrostachyus Torr. Ann. Lye. N. Y. 2: 176. 1827. 



Kuhnistera compacta Kuntze, Rev. Gen. 192. 1891. 



A perennial, with a woody tap-root; stems several, 4-8 dm. high, glabrous, striate, leafy; 

 leaves numerous, ascending, 5-8 cm. long; stipules subulate; leaflets 5-7, oblong, oblong-lan- 

 ceolate, or linear-oblong, acute or obtuse, short-petiolulate, glabrous, glandular-dotted be- 

 neath, light-green above, pale beneath, 1.5-2.5 cm. long; spikes cylindric, dense, In fruit 10- 

 12 mm. thick, 2-15 cm. long; bracts linear-lanceolate, attenuate, densely pubescent with long 

 silky hairs; calyx 4.5 mm. long, densely silky-villous with brown hairs; lobes narrowly lanceolate, 

 equaling the tube; corolla white or yellowish-white; blade of the banner cordate, 2 mm. long, 

 the claw 4 mm. long; blades of the other petals lanceolate or oblanceolate, 2 mm. long, the 

 claws about 1 mm. long; pod broadly obliquely obovate, almost half-round, 3 mm. long, spar- 

 ingly pubescent. 



Type locality: "Rio Roxo, Arkansas" [? Canadian River. Oklahoma]. 

 Distribution: Nebraska. Colorado, and Wyoming; (Oklahoma?). 

 Illustrations: Britt. & Brown, 111. Fl. /. 2108; ed. 2. /. 2512. 



18. Petalostemon flavescensS. Wats. Am. Nat. 7: 299. 1873. 



Kuhnistera flavescens Kuntze, Rev. Gen. 192. 1891. 



A perennial; stem simple, glabrous, conspicuously glandular-dotted, fully 3 dm. high; 

 stipules subulate, silky ; leaflets 3-5, narrowly oblong, obtuse, 6-12 mm. long, sparingly silky; 

 spikes dense, long-peduncled, in fruit 12-13 mm. thick, 2.5-4.5 cm. long; bracts subulate, very 

 villous, 4 mm. long; calyx very villous, 5 mm. long, the upper two lobes subulate, 2 mm. long, 

 the lower three lobes lance-ovate, 1.5 mm. long; corolla said to be yellow; blade of the banner 

 rectangular, emarginate, 3 mm. long, equaling the claw; blades of the other petals narrowly 

 oblong, 2.5 mm. long, the claws 1 mm. long; pod densely villous. (Perheps not distinct from 

 P. Searlsiae.) 



Type locality: Kanab, southern Utah. 

 Distribution: Known only from the type locality. 



19. Petalostemon obovatus T. & G. Fl. N. Am. 1: 310. 1838. 



Dalea agastachya Morie. PI. Nouv. Am. 65. 1839. 

 Kuhnistera agastachya Kuntze, Rev. Gen. 192. 1891. 

 Kuhnistera obovata A. Heller, Bull. Torrey Club 23: 122. 1896. 



A perennial; stem erect, 3-5 dm. high, densely silky-villous; leaves numerous, 3-5 cm. 

 long; stipules subulate; leaflets obovate or oval, S-10 mm. long, truncate, rounded, or acutish 

 at the apex, densely silky-villous on both sides; spikes cylindric, in fruit 15-18 mm. thick, 

 5-11 cm. long; bracts oval or ovate, acuminate, silky-villous, longer than the calyces; calyx 

 6 mm. long, silky-villous; lobes lanceolate, caudate-attenuate, twice as long as the tube; corolla 

 yellowish- white; blade of the banner cordate, 2 mm. long, the claw 2 mm. long; blades of the 



