Part 1, 1919] FABACEAE: PSORALEAE 57 



oblong to elliptic, pilose above, conspicuously glandular-dotted beneath, about 4 mm. long, 

 rounded or truncate at the apex; racemes lax; calyx-tube campanulate, membranous, 10- 

 nerved, glabrous, with few conspicuous glands between the veins; lobes triangular-ovate, 

 much shorter than the tube; blade of the banner suborbicular, 1.5 mm. long, yellowish (?); 

 wings and keel-petals purple; blades of the former 2.5 mm. long, those of the latter fully 3 mm. 

 long, the claws of both 2 mm. long. 



Type locality: Chapultepec, Federal District, Mexico. 

 Distribution: Known only from the type locality. 



20. Parosela Hegewischiana (Steud.) Rydberg. 



Dalea laxiffora Schlecht. Linnaea 12: 293. 1838. Not D. laxiflora Pursh, 1814. 



Dalea Hegewischiana Steud. Nom. Bot. ed. 2. 1: 480. 1840. 



? Trichopodium glandulosum Presl. Bot. Bemerk. 52. 1S44. 



Dalea rosea D. Dietr. Syn. PI. 4: 1017. 1847. 



Parosela lasiostoma Rose, Contr. U. S. Nat. Herb. 8: 305. 1905. 



Parosela campylostachya Rose, Contr. U. S. Nat. Herb. 12: 272. 1909. 



A perennial; stems decumbent or prostrate, glabrous, conspicuously glandular-dotted; 

 leaves 6-7 cm. long; stipules subulate, about 2 mm. long; petioles 2-3 mm. long; rachis gla- 

 brous, glandular-dotted; stipels gland-like; leaflets 13-35, obovate or oval, sometimes involute, 

 retuse or rounded at the apex, 2-5 mm. long, glabrous, conspicuously glandular-dotted be- 

 neath; peduncles terminating the branches, 1-2 cm. long; racemes dense and spike-like, 2-4 

 cm. long; bracts ovate, glabrous, or slightly ciliate, caducous; calyx-tube campanulate, 10- 

 nerved, membranous, 2 mm. long; lobes ovate, gland-tipped, shorter than the tube; banner 

 yellowish, the blade orbicular, retuse, 2.5 mm. long, the claw 2.5 mm. long; wings and keel- 

 petals rose-purple; blades of the former 3 mm. long, those of the latter 5-5.5 mm. long, the claws 

 of both 1 mm. long; pod semirhombic-obovate, glabrous, glandular-dotted. (P. campylo- 

 stachya is a form with somewhat narrower and more numerous leaflets inclined to be revolute.) 



Type locality: Mexico. 

 Distribution: Hidalgo to Oaxaca. 



21. Parosela viridiflora (S. Wats.) Rose, Contr. U. S. Nat. Herb. 

 8:305. 1905. 

 Dalea viridiflora S. Wats. Proc. Am. Acad. 21: 448. 1886. 



A perennial, with a woody base; stems decumbent, 2-3 dm. long, leafy, yellowish, glabrous 

 throughout, conspicuously glandular-dotted; leaves 2-3 cm. long; stipules setaceous, 2-4 mm. 

 long; petioles 2-3 mm. long; rachis glabrous, glandular-dotted; stipels represented by conspicu- 

 ous glands; leaflets 9-17, oblong-obovate, obtuse or retuse, 3-7 mm. long, glabrous, conspicu- 

 ously glandular-dotted beneath; peduncles at the ends of the branches, 0.5-2 cm. long; racemes 

 dense, spike-like, ovate to cylindric, 2-5 cm. long; bracts lanceolate, narrowed at the base, 

 glabrous, conspicuously glandular-dotted, deciduous; calyx-tube campanulate, membranous, 

 2 mm. long; lobes triangular, with 3 gland-teeth at the apex; corolla greenish-yellow; blade of 

 the banner suborbicular-cordate, 3 mm. long, with 3 orange glands, the claw 3 mm. long; 

 blades of the wings and keel-petals 3-4 mm. long, with an orange gland near the apex, the claws 

 1.5 mm. long; pod rounded-obovate, glabrous. 



Type locality : Santa Eulalia Mountains, Chihuahua. 

 Distribution: Chihuahua to Hidalgo. 



V. Diffusae. Perennial or annual herbs, usually with many slender branches. Leaflets 

 small, numerous, with lanceolate gland-like stipels. Racemes various. Flowers short-pedi- 

 celled. Calyx wholly glabrous; tube short, strongly 10-ribbed, not conspicuously glandular- 

 dotted; lobes short and broad, rarely equaling the tube. Corolla purple. Blade of the banner 

 small, cordate or suborbicular. Wings and keel-petals inserted below the middle of the 

 staminal tube, often near it; blades obovate, those of the keel- petals somewhat larger. Pod 

 glabrous, conspicuously gland-dotted. 



