146 NORTH AMERICAN FEORA [Volume 24 



IX. Thibaudianae. Shrubs. Leaflets distinctly petiolulate. Calyx more or less ferru- 

 ginous-strigose; teeth lanceolate or deltoid, not exceeding the tube in length. Banner rounded- 

 obovate, sessile, usually densely ferruginous-strigose on the back when young; wings obliquely 

 oblanceolate, with a rounded thick basal auricle; keel-petals obliquely oblanccolate; lateral 

 spurs acute. Pod linear, sub-cylindraceous, usually slightly flattened, gradually acuminate 

 into a stout, rather long median beak. Seeds terete or round-angled, truncate at both ends. 



21. Indigofera costaricensis Benth Vidensk Meddel. 

 1853:5 1853. 



A shrub; branches angled, glabrous or nearly so; stipules setaceous, about 5 mm. long; 

 leaves ascending, 7-15 cm. long; petiole and rachis sparingly strigose; leaflets 11-15, rarely 

 9, with subulate stipels, distinctly petiolulate. elliptic, mucronate, 1.5-3 cm. long, glabrous 

 above, strigose beneath; racemes densely many-flowered, shorter than the leaves; bracts 

 setaceous, caducous; calyx 2 mm. long, ferruginous-sericeous, the teeth lanceolate, shorter 

 than the tube; corolla brownish-white, tinged with pink, 5-6 mm. long; pod about 3 cm. 

 long, 10-12-seeded. 



Type locality: San Jose, Costa Rica. 



Distribution; Costa Rica. 



22. Indigofera salmoniflora Rose, Contr. U. S. Nat. 

 Herb. 5: 140. 1897. 



A shrub, about 1 m. high; stem somewhat angled, strigose; stipules setaceous, 5 mm. 

 long; leaves spreading, 7-15 cm. long; rachis and petiole strigose, grooved above; leaflets 

 7-9, elliptic or oval, 2-5 cm. long, mucronate, glabrous above, grayish-strigose beneath; 

 racemes many-flowered, about equaling the leaves; calyx 2 mm. long; corolla 6 mm. long, 

 salmon-pink; wings almost linear, with a rather large broadly deltoid basal auricle; pod 

 spreading, 3.5-4 cm. long, 2 mm. wide, nearly straight, strigose, 10-12-seeded; seeds 2 mm. 

 long. 



Type locality ; Ymala, Sinoloa. 



Distribution: Sinaloa. 



23 Indigofera Purpusi Brand. Univ Calif Publ 

 Bot 6: 499 1919. 



Indigofera zamapana Rydberg, in herb. 



A shrub, 5 dm. high or more; branches terete, strigose; stipules subulate, 2-3 mm. long; 

 leaves 5-10 cm. long; rachis and petiole strigose, channeled above; leaflets 21-31, distinctly 

 petioluled, elliptic, rounded at both ends, cuspidate, 1-2 cm. long, grayish-strigose on both 

 sides; racemes short, in fruit 4-10 cm. long; calyx 2 mm. long; corolla unknown; pod nearly 

 straight, 4-6 cm. long, 2 mm. thick, sparingly strigose, about 10-seeded; seeds round-angled, 

 2.5 mm. long, fully 1 mm. thick. 



Type locality: Barranca de Tenampa, Veracruz. 



Distribution: Veracruz and Federal District to Oaxaca. 



24. Indigofera Thibaudiana DC. Prodr 2: 225. 1825. 



Indigofera sp. Schlecht. & Cham. Linnaea 5: 577. 1830. 



Indigofera excelsa Mart. & Gal. Bull. Acad. Brux. 10 : 45. 1843. 

 Indigofera Chamissoniana D. Dietr. Syn. PI. 4: 1041. 1847. 



A shrub, 4-6 m. high; branches angled, strigose; stipules setaceous, 5 mm. long; leaves 

 1-2 dm. long, spreading; rachis and petiole strigose; leaflets 21-27, oblong, 2-4 cm. long, 

 strigose on both sides, paler beneath, mucronate; racemes densely many-flowered, 1 dm. 

 long or in fruit sometimes 2 dm. long; calyx 2 mm. long, ferruginous-strigose; corolla 8-9 

 mm. long; pod linear-cylindric, 2-3 cm long, 2 mm. thick, 6-8-seeded; seeds almost terete, 

 2 mm. long, 1.5 mm. thick, light-brown. 



Type locality: Unknown (that of /. excelsa: Juquila, Oaxaca). 



Distribution: San Luis Potosi to Tepic, Oaxaca, and Guatemala. 



