Part 1, 1919] FAB ACE AE: PSORALEAE 23 



flat attenuate beak 14-15 mm. long; seed 7 mm. long, flattened, transversely wrinkled, light- 

 brown. 



Type locality: Near Beaver City, Utah [according to Watson, but Palmer, loc. cit., gives the 

 locality as "between Beaver Dam, Arizona, and Saint Thomas, Nevada."]. 



Distribution: Southern Utah and Nevada, Arizona, and southern California. 



16. Pediomelum trinervatum Rydberg, sp. nov. 



Psoralea esculenta Torr. Bot. Mex. Bound. Surv. 51. 1859. Not P. esculenta Pursh, 1814. 



A perennial, with a fusiform, tuberous, farinaceous root, the tuberous portion about 5 cm. 

 long, 2 cm. thick; stem above ground very short, less than 5 cm. long; leaves digitately 5-folio- 

 late; stipules ovate or lanceolate, acuminate, 5-10 mm. long; petioles about 1 cm. long, strigose; 

 leaflets obovate, cuspidate, 2-3 cm. long, often more or less undulate-crisp on the margins, 

 strigose on both sides; peduncles 5-7 cm. long; spikes about 3 cm. long, dense; bracts lanceolate, 

 acute, about 5 mm. long; calyx strigose-canescent; tube 4 mm. long; upper 4 calyx-lobes subu- 

 late, nearly 1 cm. long, attenuate, the lowest one oblanceolate, 12-15 mm. long, short-acuminate 

 or acute, conspicuously 3-ribbed, at least in age; corolla blue, 15 mm. long; banner oblong; 

 body of the fruit ovoid, 7 mm. long, the beak flat, attenuate, 12-14 mm. long; seeds dull-brown, 



6 mm. long, strongly reticulate. 



Type collected in the vicinity of Chihuahua, June 5-10, 1908, Edward Palmer 356 (herb. N. Y. 

 Bot. Gard.). 



Distribution: New Mexico and Chihuahua. 



17. Pediomelum pentaphyllum (L.) Rydberg. 



Psoralea pentaphylla L. Sp. PI. 764. 1753. 



Lotodes pentaphyllum Kuntze, Rev. Gen. 194. 1891. 



A perennial, with a subglobose tuber 1.5-2 cm. thick; stem branched at the base, decum- 

 bent, 1-3 dm. long, terete, slender, strigose; leaves pedately 3-5-foliolate; stipules subulate, 

 small; petioles 3-5 cm. long, the 4 (rarely 2) lower leaflets inserted nearly at the same point, 

 the terminal one borne on a prolongation of the rachis 5-10 mm. long; all linear-oblong to 

 elliptic, 1-2.5 cm. long, sparingly strigose on both sides, acute at each end ; peduncles axillary, 

 1-2 cm. long; spikes very short, 2-S-flowered; calyx strigose in anthesis, 3 mm. long, enlarg- 

 ing in fruit and becoming 6-7 mm. long; lobes lance-subulate, slightly longer than the tube; 

 corolla about 6 mm. long, blue; banner obovate, with triangular basal lobes; body of the fruit 

 ovoid, flattened, 5 mm. long, strigose, the beak 6 mm. long; seed smooth, slightly longer than 

 broad, about 5 mm. long, grayish-brown. 



Type locality: Mexico. 



Distribution: Chihuahua and Coahuila to Jalisco, San Luis Potosi, and Guanajuato. 



Illustration: Hist. Acad. Sci. Paris 1744: pi. 17. 



18. Pediomelum rhombifolium (T. & G.) Rydberg. 



Psoralea rhombifolia T. & G. FI. N. Am. 1: 303. 1838. 

 Lotodes rhombifolium Kuntze, Rev. Gen. 194. 1891. 



A perennial, with a deep-seated, fusiform, farinaceous root; stem branching at the base, 

 1-5 dm. long, decumbent or trailing, striate, strigose; leaves pinnately 3-foliolate; stipules 

 subulate or lanceolate, 3-5 mm. long; petioles 2-5 cm. long, or those of the upper leaves shorter; 

 leaflets 1-3 cm. long, ovate-rhombic and acute or those of the lower leaves suborbicular and 

 obtuse or rounded at the apex; peduncles 3-10 cm. long; spikes subcapitate, few-flowered; 

 bracts 3 mm. long, lanceolate; calyx strigose, slightly gibbous on the upper side; tube 2-2.5 

 mm. long; lowest lobe lanceolate, 4 mm. long, the rest 3 mm. long; corolla dark-blue or reddish, 



7 mm. long; banner obovate, retuse, with distinct rounded basal lobes; pod strigose, the body 

 ovoid, 4-5 mm. long, the beak straight, about 8 mm. long; seed brownish, obliquely oval, shining 

 or slightly curved. 



Type locality: Texas. 



Distribution: Louisiana to Texas, Tamaulipas, and Lower California. 



19. Pediomelum Sonorae Rydberg, sp. nov. 



A perennial, with a fusiform deep-seated root; stem branched at the base; branches pros- 

 trate, 1-4 dm. long, grayish, strigose; leaves pinnately 3-foliolate; stipules lanceolate, 3-5 



