Part 3. 1923] FABACEAE: INDIGOFEREAE 153 



49. Indigofera sphinctosperma Standley, Contr. U. S. 

 Nat. Herb. 20: 216. 1919. 



A shrub, 1 m. high or more; branches slender, angled, densely white-strigose; stipules subu- 

 late, 2 mm. long; leaves 4-8 cm. long; rachis and petiole densely strigose; leaflets 1 1-15, oval, 

 6-15 mm. long, 4-8 mm. wide, rounded at each end, mucronate, strigose on both sides, pale 

 beneath; racemes slender, 5-15 cm. long, longer than the leaves; calyx densely strigose, about 

 1 mm. long; corolla 4-5 mm. long, strigose without; pod 3-4 mm. long, oblong, truncate at 

 each end, somewhat angled, 1-seeded; seed 2-2.5 mm. long, subcylindric, 1.5 mm. thick. 



Type locality: Barranca de Santa Maria, Zacuapan, Veracruz. 



Distribution: Veracruz 



XII. Platycarpae. Shrubs. Leaflets 13-21, petiolulate, rounded at the base. Racemes 

 few-flowered. Calyx-teeth deltoid, about equaling the tube. Banner densely ferruginous- 

 strigose without, elliptic-oval; wings shorter than the banner and keel, oblong; keel-petals 

 obliquely oblanceolate, acute; lateral spurs slender, acute. Pod broad. Seeds flat, orbicular. 



50. Indigofera platycarpa Rose, Contr. U. S. 

 Nat. Herb. 8: 47. 1903. 



A shrub. 1-2 m. high, much branched; branches rounded, white-strigose or somewhat 

 ferruginous; stipules subulate, 2 mm. long; leaves 3-6 em. long; leaflets 13-21, oblong to obo- 

 vate, rounded at the base, rounded or retuse at the apex, mucronate, strigose on both sides, 

 4-10 mm. long; racemes few-flowered, shorter than the leaves; calyx 1 mm. long; corolla 7-10 

 mm. long; keel-petals obliquely oblanceolate, acute; pod 2-3 cm. long, 4 mm. broad, less 

 than 1 mm. thick, somewhat constricted between the seeds, 3-5 seeded; seeds 2 mm. in diam- 

 eter. 



Type locality: Iguala, Guerrero. 



Distribution: Guerrero and Morelos. 



Illustration: Contr. U. S. Nat. Herb. 8: pi. 7. 



Doubtful and excluded species 



Indigofera mexicana L. f. Suppl. 335. 1781. This is Psoralea Mutisii, a native of 

 Colombia. 



Indigofera Lagascana DC. Prodr. 2: 229. 1825. The type locality is given as "Cheu- 

 chim," a place which I have been unable to locate, perhaps not in North America. G. Don 

 suggests Peru. 



Indigofera haitensis Desv. Ann. Sci. Nat. 9: 410. 1826. This is unknown; perhaps 

 /. lespedezoides. It was described from Hispaniola. 



Indigofera Berteriana Spreng.Syst. 3: 277. 1826. This was described from the island 

 of Guadeloupe. It is said to have 1 -flowered peduncles, a character not found in any North 

 American species. 



Indigofera lotoidEs Schlecht. Linnaea 12: 282. 1838. Not /. lotoidcs Lam. 1789; 

 Indigofera Ehrenbergiana Steud. Nom. Bot. ed. 2. 1: 806. 1840. This is evidently a species of 

 .1 nisolotus. 



Indigofera hippucrEpoidEs Schlecht. Linnaea 12: 282. 1838. This is evidently a species 

 of Anisolotus. 



Indigofera coronilloidEs Mart. & Gal. Bull. Acad. Brux. 10 ! ; 45. 1843. This is 

 unknown; the type came from Penoles in Misteca Alta, Oaxaca. 



