Part 4, 1924] FABACEAE: GALEGEAE 235 



2. Willardia mexicana (S. Wats.) Rose, Contr. U. S. Nat. 

 Herb. 1: 98. 1891. 



Coursetia mexicana S. Wats. Proc. Am. Acad. 21: 424. 1886. 



A small tree, 3-10 m. high, with smooth bark; twigs minutely pubescent when young, 

 soon glabrate; leaves 7-10 cm. long; rachis sparingly pubescent, sulcate above; leaflets 9-15, 

 elliptic, obtuse at each end, 1.5-3 cm. long, 12-16 mm. wide, glaucous-green above, yellowish- 

 green beneath, finely pubescent on both sides; racemes somewhat panicled; calyx. 4 mm. long 

 and broad, puberulent, the lobes minute; corolla lilac, about 1 cm. long; pod thin, tapering at 

 each end, 5-6 cm. long, 10-12 mm. wide, puberulent, 8-10-seeded; seeds about 1 cm. long, 

 smooth and shining, salmon-colored. 



Type locality: Hacienda San Miguel. Chihuahua. 

 Distribution: South-western Chihuahua, Sonora, and Sinaloa. 



3. Willardia eriophylla (Benth.) Standley, Contr. U. S. Nat. 

 Herb. 19:483. 1922. 



Lonchocarpus eriophyllus Benth. Jour. Linn. Soc. 4: Suppl. 94. 1860. 

 Willardia veluiina Rose, MS. 



A shrub or tree, 3-5 m. high; young branches grayish-velutinous; stipules minute, lance- 

 olate; leaves 6-8 cm. long; rachis densely velutinous; leaflets 11-23, elliptic or lance-elliptic, 

 thick, obtuse at each end, or subacute at the apex, 1.5-3.5 cm. long, 8-10 mm. wide, finely 

 velutinous above, densely silky- villous and strongly veined beneath; racemes 7-10 cm. long; 

 peduncle and pedicels velutinous; flowers often 2 at the nodes; calyx-tube 5 mm. long and 

 broad, velutinous, the lobes short-triangular, about 1 mm. long; corolla pinkish-white or 

 reddish-purple, somewhat pubescent, nearly 2 cm. long; banner suborbicular, reflexed; blades 

 of wings oblong-oblanceolate, with a rounded basal auricle; keel-petals similar, united to near 

 the tip, more falcate; pod white-velutinous, 10-13 cm. long, 13 mm. wide, acutish at each end, 

 6-8-seeded; seeds 12 mm. long, 8 mm. high. 



Type locality: Chilla, Puebla. 

 Distribution: Puebla, Morelos, and Guerrero. 

 Illustration: Am. Jour. Bot. 11: pi. 35 V. 



23. HESPEROTHAMNUS Brand. Univ. Calif. Publ. Bot. 6:499. 

 1919. 



SeUrolhamnus Harms, Repert. Sp. Nov. 17: 325. 1921. 



Shrubs or small trees. Leaves odd-pinnate, with petioluled entire leaflets, deciduous 

 stipules and filiform stipels. Flowers in axillary racemes or raceme-like panicles, i. e., the 

 flowers several fascicled on short branches at each node of the peduncle; bracts filiform; 

 bractlets wanting. Petals subequal, the claw slender, nearly half as long as the blade. Blade 

 of the banner rounded-obovate, erect. Blades of the wings oblong, falcate, rounded at the 

 apex, truncate on the upper margin at the base. Blades of the keel-petals strongly lunate, 

 their upper half united, the apex obtuse, and the base with a rounded auricle; stamens mona- 

 delphous, the upper stamen free at the base, adnate to the staminal sheath at the middle. 

 Anthers uniform. Ovary subsessile, several-ovuled; style abruptly bent at the base, glabrous; 

 stigma minute, capitate. Pod flat, linear or linear-oblong, acute at each end, 2-valved, without 

 partitions. Seeds suborbicular, compressed. 



Type species, Lonchocarpus littoralis Brand. 



Pubescence of the lower surface of the leaves and of the calyx spreading. 



Pod 1.5-2 cm. wide; leaflets ovate, cuspidate-acuminate. 1. H . littoralis. 



Pod 6-7 mm. wide; leaflets ova! or oblong, acute or short-acuminate. 2. H. Purpusi. 



Pubescence of the lower surface of the leaves and of the calyx appressed. 



Calyx-lobes lanceolate, acuminate, 4 mm. long. 3. //. pentaphyllus. 



Calyx-lobes ovate, 2-3 mm. long, the uppermost rounded at the apex, the 

 rest acute or'obtuse. 



