24 NORTH AMERICAN FLORA (Volume 24 



mm. long; petioles 2-3 cm. long; leaflets broadly ovate to orbicular, mostly obtuse, sparingly 

 strigose above, strigose-canescent beneath, 7-20 mm. long; peduncles 1-2 cm. long; spikes 

 few-flowered, subcapitate; bracts elliptic or oval, 2-3 cm. long; calyx densely strigose; tube 

 about 3 mm. long; lobes lanceolate, acute, the lowest about 3 mm. long, the rest slightly shorter; 

 corolla pale, with purple-tipped keel, 7-8 mm. long; banner broadly obovate, with rounded 

 basal lobes; pod strigose, the body 5 mm. long, ovoid, the beak scarcely longer, curved at the 

 apex; seed obliquely oval, shining, brown. 



Type collected in the vicinity of Alamos, Sonora, March 17, 1910, Rose, Standley & Russell 

 13025 (herb. N. Y. Bot. Gard.). 

 Distribution: Sonora. 



20. Pediomelum oliganthum (Brand.) Rydberg. 



Psoralea oligantha Brand. Univ. Calif. Publ. Bot. 4: 179. 1911. 



A perennial herb, with a fusiform root; stem about 1 dm. long, sparingly strigose; stipules 



lanceolate or subulate; leaves pinnately 3-foliolate; petioles 4-6 cm. long; leaflets glabrous or 



with a few appressed hairs, the terminal one broadly ovate, acute or acuminate, or on the lower 



leaves obtuse, 1.5-2.5 cm. long, the lateral ones oval or elliptic, somewhat smaller; leaflets of 



the lower leaves much smaller and suborbicular; peduncles 5-6 cm. long; flowers spicate; 



bracts ovate; calyx strigose on the veins; tube 2.5 mm. long; lowest lobe fully 5 mm. long, 



lanceolate, acute or obtuse, the rest 3.5 mm. long, narrowly lanceolate, acute or acuminate; 



corolla fully 8 mm. long; banner broadly obovate; pod obliquely ovate, strigose, the beak not 



longer than the body. 



Type locality: Sierra de Parras. Coahuila. 

 Distribution: Coahuila, and apparently also Jalisco. 



21. Pediomelum brachypus Rydberg, sp. nov. 



A perennial, with a fusiform root; stem branched at the base, decumbent, strigose, 1-3 

 dm. long; leaves pinnately 3-foliolate; stipules ovate, herbaceous, 3-5 mm. long; petioles less 

 than 1 cm. long; leaflets rhombic-ovate or rhombic-lanceolate, glabrous above, sparingly 

 strigose beneath, rarely 1.5 cm. long, acute; peduncles 2-4 cm. long; spikes few-flowered, 

 subcapitate; calyx sparingly strigose; tube about 2 mm. long; lobes nearly equal, 2 mm. long, 

 lanceolate, acute; corolla 6 mm. long, purplish, otherwise as in P. rhombijolium; pod strigose, 

 the body ovate, 4 mm. long, the beak of about the same length, hooked at the apex. 



Type collected at Los Naranjos. Oaxaca, August, 1908. Purpus 3049 (herb. N. Y. Bot. Gard.). 



22. Pediomelum humile Rydberg, sp. nov. 



Psoralea esculenia A. Gray, PI. Wright. 2: 37 (erroneously referred). 1853. 



A subacaulescent perennial, with a fusiform deep-seated root 4-6 cm. long, 1-3 cm. thick; 

 stem above ground almost none; leaves 3-foliolate with stalked terminal leaflet, clustered at 

 the base; stipules membranous, lanceolate; petioles 3-6 cm. long, strigose; leaflets about 2 

 cm. long, conspicuously glandular-punctate, strigose beneath and on the veins above, the lat- 

 eral ones broadly and obliquely ovate, sessile, the terminal one broadly rounded-rhombic or 

 suborbicular, on a rachis about 1 cm. long; peduncles about 4 cm. long, strigose; spikes dense, 

 many-flowered, 2-3 cm. long; calyx strigose; tube about 5 mm. long; lobes linear-subulate, 

 7-8 mm. long; corolla purplish, 15 mm. long or more; fruit unknown. 



Type collected in the valley of Rio Grande near Piedras Nigras, Coahuila, April 19, 1910, 

 Pringle 9205 (U. S. Nat. Herb. no. 381823). 



Distribution: Type locality and San Felipe, Texas. 



9. APOPLANESIA Presl, Symb. Bot. 1: 63. 1831. 



Microlobium Liebm. Vidensk. Meddel. 1853: 104. 1854. 



Large shrubs, with glandular-dotted foliage. Leaves alternate, odd-pinnate, but leaflets 

 usually not exactly opposite. # Stipules none. Flowers in axillary and terminal panicles. 

 Calyx with a short tube; lobes slightly unequal, foliaceous, 3-ribbed, reticulate, obtuse, ac- 

 crescent in fruit. Corolla sub-papilionaceous; petals short-clawed, of nearly equal length, all 



