346 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
12.Trifolium rydbergii Greene, Pittonia 3: 222. 1897. 
Tyre Locatiry: Wind River Mountains, Wyoming. 
Rance: Idaho and Montana to Utah and northern New Mexico. 
New Mexico: Chama (Standley 6510, Eggleston 6647). Moist meadows, in the 
Transition Zone. 
9. ANISOLOTUS Bernh. Brrp’s-roor TREFOIL. 
Herbaceous annuals or perennials, 50 cm. high or less, generally with numerous 
rigid and ascending or weak and decumbentor prostrate stems; leaves numerous, small, 
with black-glandular stipules, pinnate, sometimes appearing palmate by reduction of 
the rachis, 4 to 7-foliolate, the leaflets small, short-obovate to oblong-linear; flowers 
axillary and sessile or in few-flowered pedunculate clusters, yellow or reddish orange; 
calyx lobes mostly very narrow, about the length of the tube; legume straight, slightly 
or not at all flattened. 
KEY TO THE SPECIES. 
Annual; plants loosely villous throughout...................--- 1, A. trispermus. 
Perennials; plants more or less puberulent, one species with 
spreading hirsutulous pubescence. 
Leaves without appreciable rachis, the leaflets crowded on 
the end of a very short petiole (1 mm. long), or sessile 
and appearing as a fascicle of simple leaves; flowers 
pedunculate or sessile, 
Flowers almost all solitary and axillary, with no 
peduncle, or those of the upper part of the stem 
occasionally short-peduncled................---- 2. A. wrightit. 
Flowers in | to 3-flowered clusters, the peduncles usually 
longer than the leaves.................2...-0-5-- 3. A. rigidus. 
Leaves with a rachis, although usually a short one, and an 
appreciable petiole; flowers pedunculate. 
Plants low, decumbent to prostrate; leaflets short and 
small, obtuse, 8 mm. long or less................. 4, A. neomexicanus. 
Plants taller; upper leaflets acute, 10 mm. long or more. 
Branches ascending, stout; leaflets all narrowly 
oblong-lanceolate or oblanceolate. .......... 5. A. puberulus. 
Branches weak, decumbent, only the ends ascend- 
ing; leaflets various, 
Pubescence appressed; basal leaflets short and 
rounded, elliptic-obovate................ 6. A. nummularius. 
Pubescence spreading; all leaflets elliptic- 
lanceolate, about 10 mm. long.......... 7. A. mollis, 
1. Anisolotus trispermus (Greene) Woot. & Standl. Contr. U. 8. Nat. Herb. 16: 
135. 1913. 
Lotus trispermus Greene, Erythea 1: 258. 1893. 
TYPE Locauity: Hills bordering the Mohave Desert, California. 
Ranae: California to western New Mexico. 
New Mexico: Silver City; Mangas Springs. 
2. Anisolotus wrightii (A. Gray) Rydb. Bull. Torrey Club 33: 144, 1906. 
Hosackia wrightii A. Gray, Pl. Wright. 2: 42. 1853. 
Lotus wrightii Greene, Pittonia 2: 143. 1890. 
Tyre Locauity: Stony hills at the Copper Mines, New Mexico. Type collected by 
Wright (no. 1000). 
Ranae: Colorado to New Mexico and Arizona, south into Mexico. 
