Part 1, 1919] FABACEAE: PSORALEAE 59 



25. Parosela diffusa (Moric.) Rose, Contr. U. S. Nat. Herb. 8: 



305. 1905. 



Dalea diffusa Moric. Mem. Soc. Geneve 6: 536. 1833. 



Dalea gracilis H. & A. Bot. Beech. Voy. 2S6. 1836. Not D. gracilis Kunth, 1824. 

 Dalea ramossissima Mart. & Gal. Bull. Acad. Brux. 10 2 : 41. 1843. 

 Trichopodium diffusum Presl, Bot. Bemerk. 53. 1844. 



A slender perennial herb; stem 4—10 dm. high, glabrous, with spreading branches, minutely 

 glandular-dotted; leaves 1-4 cm. long; stipules 1-2 mm. long, subulate; petioles 1-3 mm. long; 

 rachis glabrous, not winged, scarcely margined; stipels minute, subulate; leaflets of the stem- 

 leaves 13-23, of the branch-leaves 3-9, oblong to obovate, rounded or retuse at the apex, 2-5 

 mm. long, glabrous, obliquely striate above, glandular-punctate along the margins, and spar- 

 ingly and minutely so beneath; peduncles terminating the branches, 1 cm. long; racemes lax, 

 2-5-flowered; bracts ovate, glabrous, caducous; calyx-tube broadly turbinate, about 1.5 mm. 

 long, 10-ribbed, with few rather large glands; lobes broadly ovate, obtuse or acutish, shorter 

 than the tube; banner usually yellowish, the blade reniform, 1 mm. long, 1.5 mm. broad, the 

 claw 0.5 mm. long; wings and keel-petals purple, the blades 3.5-4 mm. long, the claws 0.5 mm. 

 long; pod broadly obovate, glabrous, conspicuously glandular-dotted. 



Type locality: Mexico. 



Distribution: Sinaloa to San Luis Potosi and Guatemala. 



Illustrations: Mem. Soc. Geneve 5: pi. 6; Moric. PI. Nouv. Am. pi. 6. 



26. Parosela dispansa Rydberg, sp. nov. 



A perennial, shrubby at the base; stem diffusely branched, chestnut-brown, glabrous; 

 leaves 1.5-3 cm. long, spreading; stipules minute, subulate; rachis glabrous, sparingly and min- 

 utely glandular-dotted; stipels subulate-conic, fleshy, minute; leaflets 9-13, elliptic, 3-5 mm. 

 long, retuse, glabrous and striate on both sides, minutely glandular-punctate beneath; racemes 

 short-peduncled, 1-2 cm. long; bracts ovate, acute, glabrous, glandular-dotted, denticulate on 

 the margins; calyx-tube turbinate, nearly 2 mm. long, strongly 10-angled, glabrous, minutely 

 glandular in the intervals; upper 4 teeth ovate, 1 mm. long, denticulate-ciliolate, the lowest one 

 lanceolate, 1.5 mm. long; corolla violet or rose-purple; blade of the banner rounded-reniform, 

 2 mm. long, 2.5 mm. wide, the claw 1.5 mm. long; blades of the wings and keel-petals 4 mm. 

 long, the claws 1-1.5 mm. long; pod glabrous, with a few gland-dots. 



Type collected in the mountains near Talpa, Jalisco, March 7, 1897, E. W. Nelson -1034 (U. S. 

 Nat. Herb. no. 327061). 



27. Parosela submontana Rose, Contr. U. S. Nat. Herb. 8: 306. 

 1905. 



A perennial, woody below; stem 5-10 dm. high, with long slender glabrous branches, 

 more or less purplish and minutely glandular-dotted; leaves many, 2-4 cm. long; stipules subu- 

 late, 3 mm. long; petioles 3-4 mm. long; rachis glabrous, wingless, sparingly glandular-punctate; 

 stipels minute, subulate; leaflets 31-41, oblong or linear-oblong, 5-10 mm. long, glabrous, 

 glandular-dotted along the margins; peduncles terminating the branches; racemes 3-8 cm. 

 long, rather dense, many-flowered; calyx- tube broadly turbinate, strongly 10-ribbed, 2-2.5 

 mm. long; lobes ovate, acute, serrulate on the margins, shorter than the tube; corolla purple; 

 blade of the banner cordate, retuse, 3-4 mm. long, the claw 1 mm. long; blades of the wings 

 5 mm. long, those of the keel-petals 6 mm. long, the claws of both 1 mm. long; pod glabrous, 

 conspicuously glandular-dotted. 



Type locality: Plateado. Zacatecas. 

 Distribution: Chihuahua to Puebla and Oaxaca. 



28. Parosela crenulata (H. & A.) Rose, Contr. U. S. Nat. Herb. 8: 



306. 1905. 



Dalea crenulata H. & A. Bot. Beech. Voy. 285. 1836. 



A shrub, with virgate branches, glabrous; leaves 1-2 cm. long, spreading; stipules small, 

 subulate; petioles 2-4 mm. long; rachis glabrous, scarcely margined; stipels minute; leaflets 



