212 NORTH AMERICAN FLORA [Volume 24 



6. Diphysa occidentalis Rose, Contr. U. S. Nat. Herb. 

 12: 271. 1909. 



A shrub or small tree; branches grayish, glabrous; stipules linear-lanceolate, 5-7 mm. 

 long, caducous; leaves 4—6 cm. long; leaflets 13-19, elliptic or oval, mostly acute at each end, 

 8-15 mm. long, thin, glabrous; racemes 2-4 cm. long; bracts oblong to linear, 6-7 mm. long; 

 bractlets ovate, 2 mm. long; pedicels 1-2 cm. long; calyx glabrous, except the ciliate margins 

 ot the lobes, the tube (including the hypanthium) 5-6 mm. long, the upper 4 lobes 3 mm. long, 

 ovate, the uppermost two rounded, the lateral ones acute at the apex, the lowest one 4-5 mm. 

 long, lanceolate, acute; corolla yellow, about 15 mm. long, similar to that of D. robinioides; 

 pod oblong, 4—8 cm. long, 15-20 mm. broad, with a few hispid hairs; seeds light-brown, 5 

 mm. long, 2.5 mm. broad. 



Type locality: Guaymas, Sonora. 

 Distribution: Sonora to Guerrero. 



7. Diphysa carthagenensis Jacq. Enum. PI. Carib. 28. 1760. 



Diphysa robinioides Millsp. Field Mus. Publ. Bot. 1: 367. 1898. Not D. robinioides Benth. 1853. 



A tree, up to 20 m. high; young branches glabrous or sparingly strigose, slender; stipules 

 subulate, 3 mm. long; leaves 4-10 cm. long; rachis glabrous or nearly so; leaflets 9-19, oblong, 

 7-15 mm. long, rounded or obtuse at the base, rounded to retuse at the apex, glabrous, green 

 on both sides; racemes 3-5 cm. long, 1-4-flowered; bracts oblong, 2 mm. long, caducous; 

 bractlets oblanceolate, obtuse, 3 mm. long; calyx glabrous; tube (including the hypanthium) 

 5 mm. long; uppermost two lobes ovate, rounded or obtuse at the apex. 2 mm. long, the 

 lateral ones lanceolate, acute, the lowest narrowly lanceolate, 3 mm. long; corolla about 1 cm. 

 long; pod about 4 cm. long, and d 1.5 m. broad, wrinkled, glabrous; stipe about 5 mm. long. 



Type locality: Carthagena, Colombia. 



Distribution: Yucatan; also in Colombia and Venezuela. 



Illustrations: Jacq. Sel. Stirp. Am. pi. 180, f. 58; Lam. Tab. Encyc. pi. 605. 



S. Diphysa suberosa S. Wats. Proc. Am. Acad. 22: 405. 1887. 



A low shrub, 1-3 m. high; branches glabrous, often short and somewhat spinescent, the 

 trunk with corky bark; stipules lance-subulate, falcate, about 5 mm. long; leaves 3-10 cm. 

 long; rachis glabrous; leaflets 7—11, subalternate, oval or oblong-obovate, acute or obtuse, 

 apiculate, 4-15 mm. long, fifm, glabrous, prominently veined beneath; racemes 2-4 cm. long, 

 1-3-flowered; bracts lanceolate, 1-2 mm. long, caducous; bractlets ovate, 5-6 mm. long, acute 

 or short-acuminate, more persistent; calyx glabrous, the tube (including the hypanthium) 

 7-8 mm. long; uppermost two lobes broadly ovate, rounded at the apex, 3 mm. long, the lateral 

 ones ovate, acute, the lowest one lanceolate, acuminate; pod 5-6 cm. long, about 1 cm. broad, 

 round-carinate on the backs of the valves; seeds light-brown, 6 mm. long, 2 mm. wide. 



Type locality: Barranca near Guadalajara, Jalisco. 

 Distribution: Sonora to Morelos and Oaxaca. 



9. Diphysa minutifolia Rose, Contr. U. S. Nat. Herb. 12: 271. 

 1909. 



A shrub, 1-2 m. high; branches often very short, rather densely pilose-puberulent with 

 spreading hairs; stipules subulate, 4-5 mm. long, falcate; leaves 4—6 cm. long; rachis pilose- 

 puberulent; leaflets numerous, 25-39, oblong, 3-6 mm. long, rounded at each end, more or less 

 short-pilose on both sides; racemes 2-3cm. long, 1- or 2-flowered; peduncles and pedicels pilose; 

 calyx nearly glabrous, except the ciliolate margins; tube (including the hypanthium) 5 mm. 

 long; uppermost two lobes rounded-ovate, the lateral ones ovate, acutish, the lowest one 



