848 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
10. ACMISPON Raf. 
Annual, similar to Anisolotus; leaves 3-foliolate, rarely 1-foliolate; stipules reduced 
to mere traces of glands; pod straight, readily dehiscent. 
1. Acmispon americanum (Nutt.) Rydb. Bull. Torrey Club 40: 45. 1913. 
Lotus sericeus Pursh, Fl. Amer. Sept. 489. 1814, not DC. 1813. 
Trigonella americana Nutt. Gen. Pl. 2: 120. 1818. 
Tyre Locaity: “On the dry and open alluvial soils of the Missouri, from the river 
Platte to the Mountains,”’ ; 
Rance: Washington and Minnesota to California and New Mexico. 
New Mexico: Mule Creek ( Wooton). 
11. PSORALEA L. 
Perennial, more or less gland-dotted herbs (glands inconspicuous in some species), 
with palmately 3 to 5-foliolate leaves; flowers in capitate or racemose clusters; sta- 
mens diadelphous; pods small, 1-seeded, indehiscent. 
KEY TO THE SPECIES. 
Flowers more than 12 mm. long, in dense spikes; plants low, with 
short stems; roots long, tuberous. 
Stems hirsute............... 00.0.2. c cece e ce cece cee eee eeeees 6. P. esculenta, 
Stems not hirsute, the pubescence sericeous or canescent. 
Leaflets linear to oblanceolate, acutish; spikes elongate... 1. P. hypogaea. 
Leaflets obovate, rounded; inflorescence subcapitate. .... 2. P. megalantha, 
Flowers small, less than 8 mm. long, in racemes or interrupted 
spikes; plants tall and branching; roots not tuberous. 
Flowers in interrupted spikes; leaves silvery. ............... 3. P.argophylla. 
Flowers in racemes; leaves not silvery. 
Racemes short and dense; fruit globose; upper leaflets 
linear... 2.2.2... eee eee eee eee eeeee 4, P. micrantha. 
Racemes loose, elongate; fruit ovoid; upper leaflets ob- 
lanceolate or elliptic...................2.2--.---. 5. P. tenuiflora, 
1. Psoralea hypogaea Nutt.; Torr. & Gray, Fl. N. Amer. 1: 302. 1838. 
TYPE Locauity: ‘Plains of the Platte.’’ 
Rance: Nebraska to New Mexico and Texas. 
New Mexico: Taos (Stevenson). 
2. Psoralea megalantha Woot. & Standl. Contr. U. §. Nat. Herb. 16: 140. 1913. 
Tyre Locauity: Aztec, New Mexico. Type collected by Baker (no. 440). 
Rance: Known only from type locality, in the Upper Sonoran Zone. 
3. Psoralea argophylla Pursh, Fl. Amer. Sept. 475. 1814. 
TYPE LocALITy: ‘‘On the banks of the Missouri.” 
Range: Wisconsin and Saskatchewan to Missouri and New Mexico. 
New Mexico: Sierra Grande; Raton Mountains. Open slopes. 
4. Psoralea micrantha A. Gray, U.S. Rep. Expl. Miss. Pacif. 4: 77. 1856. 
Tyre Locauity: ‘‘Sand hills, near the last camp on the upper Canadian.” 
RaNnGE: Oklahoma and western Texas to Arizona. 
New Mexico: West of Santa Fe; Coolidge; Tesuque; San Augustine Plains; Zuni; 
Mogollon Mountains. Upper Sonoran Zone. 
