Wright's Sensitive Pea

Chamaecrista mazatlensis Rose, sp. nov
SufTrutescent, with very slender, purplish prostrate or ascending, loosely short-pubescent branches up to about 5 dm. long. Stipules linear-lanceolate, acuminate, 3-5 mm. long; leaflets 4-7 pairs, oblong, 4-9 mm. long, obtuse, apiculate, glabrous, strongly veined, the midvein about one-third excentric; petiole short, bearing a long-stalked, flat gland about 0.2 mm. broad; pedicels very slender, about 1.5 cm. long; sepals lanceolate, glabrate, 7-9 mm. long; petals about 10 mm. long.
Vicinity of Mazatlan, Sinaloa, March 31, 1910, Rose, Standley &■ Russell 1SX2-).

Chamaecrista ortegae Britton, sp. nov
Perennial, with slender, prostrate or diffuse puberulent branches 1-2 dm. long. Stipules narrowly lanceolate, ciliolate, acuminate, about 3 mm. long; petiole 2-4 mm. long, bearing a small, short-stalked or subsessile gland; rachilla puberulent; leaflets 5-7 pairs, pale green, subcoriaceous, linear-oblong to oblong-obovate, glabrous, minutely ciliolate, obtuse, minutely apiculate, 4-8 mm. long, strongly veined, the costa about one-third excentric; pedicels filiform, puberulent, bracteolate above, 2-2.5 cm. long; sepals lanceolate, acuminate, puberulent, 6-8 mm. long; petals nearly 1.5 cm. long; legume linear, 3 cm. long, 3.5 rain, wide, shoit-lipped, puberulenl.
Capiile, Mazatlan, Sinaloa, 200 m altitude, 1925, J. C. Ortega 60SS.

Chamaecrista palmeri (S. Wats.) Greene, Pittonia 3: 242 1897.
Cassia Palmeri S. Wats. Proc. Am. Acad. 22: 408. 1887.
Perennial, with a stout woody caudex; stems slender, loosely or densely pilose, 2-4 dm. long. Stipules linear-lanceolate, acuminate, few-nerved, 5-S mm. long; petiolar gland small, stalked; leaflets 6-10 pairs, oblong, chartaceous, apiculate, 6-10 mm. long, glabrous, sometimes ciliolate, strongly pinnately veined, the midvein excentric; pedicels slender, glabrate or pilose, 2-3 cm. long; sepals lanceolate, pilose, 8-10 mm. long; petals 12-15 mm. long; legume linear, .5-4 cm. long, sparingly appressed-pubescent.
Type locality: Rio Blanco, Jalisco. Distribution: Jalisco; Durango.

Chamaecrista Wrightii (A. Gray) Wooton & ■Statiditv, Contr U. S. Nat. Herb. 19: 335. 1915.
Cassia WrisMii A. Gray, PI. Wright. 2: 50. 1853.
Perennial; stems 3-4 dm. high, puberulent in lines, Stipules lanceolate, acuminate, Klalirous, sometimes ciliolate, 3-4 mm. long; petiolar gland long-stalked, discoid, about 0.2 mm. in diameter; leaflets 6-8 pairs, oblong, oblique, glabrous, subchartaceous, rounded or obtuse, niucronulate, 8-10 mm. long, about 2 mm. wide, faintly few-veined, the costa excentric; pedicels 3-4 cm. long, sparingly puberulent; sepals ovate, acute, about 7 mm. long, glabrous; petals 10-12 mm. long; legume broadly linear, 3-4 cm. long, 5 mm. wide, short-tipped, appressedpuberulent.
Type uocauty: Hillsides on the Sonoita, near Deserted Ranchn, Sonora. Distribution: .Southern Arizona and northeastern Sonora.

Chamaecrista chiapensis Britton & Rose, sp. nov
A low shrub, the very slender branches prostrate or ascending, short-pubescent, about 2 dm. long, or shorter. Stipules lanceolate, long-acuminate, strongly few-veined, 2.5-3.5 mm. long; petiolar gland orbicular, stout-stipitate, about 0.2 mm. in diameter; leaflets 5-7 pairs, obliquely linear-oblong, glabrous, aristulate, subcoriaceous, 3-6 mm. long, 1-1.5 mm. wide, strongly veined, the midvein nearly marginal; pedicels solitary, filiform, 1.5-2 cm. long, sparingly pubescent; sepals lanceolate, acuminate, sparingly long-pubescent, 6-7 mm. long; lower petal about 15 mm. long, the others much narrower, about 10 mm. long.
Rocky soil, Monserrate, Chiapas, May, 1925, Pur pus 10592.

Chamaecrista alamosensis Britton & Rose, sp. nov
Shrubby, branched, about 4 dm. high, the very slender branches puberulent when young, becoming glabrous. Stipules linear, acuminate, glabrous, 4-5 mm. long; petiole short, bearing a long-stalked, subcapitate gland about 0.2 mm. broad; leaflets 5-10 pairs, subcoriaceous, rather faintly veined, linear to oblong, aristulate, glabrous, 6-9 mm, long, the midvein very excentric; pedicels very slender, up to 4 cm. long; legume linear, nearly 2 cm. long, about 2 mm. wide, sparingly loosely pubescent.
Sierra de Alamos, Sonora, March IS, 1910, Rose, Standley e* Russell 13046.

Chamaecrista mexiae Britton, sp. nov
Suffrutescent, with slender, pubescent and pilose branches up to 3 dm. long. Stipules lanceolate, long-ciliate, 5-6 mm. long; petiole short, bearing a subsessile gland; rachilla longpilose; leaflets 7-10 pairs, bright green, subcoriaceous, oblong, glabrous but ciliolate, obtuse, or acutish, apiculate or aristulate, 6-8 mm. long, strongly veined, the costa about one-third excentric; pedicels filiform, pubescent, bracteolate above, 1.5-2 cm. long; sepals lanceolate, about 7 mm. long, sparingly long-pilose; petals nearly 1.5 cm. long; young legume narrowly linear, pubescent and villous, 2.3 cm. long, 2 mm. wide, short-tipped.
Between Yxtlan and Barranca del Oro, 1480 m. altitude, Nayarit, September 27, 1926, Ynes Mexia 790.