346 CONTRIBUTIONS FROM THE NATIONAL HERBAEIUM. 



12.Trifolium rydbergii Greene, Pittonia 3: 222. 1897. 

 Type locality: Wind River Mountains, Wyoming. 

 Range: Idaho and Montana to Utah and northern New Mexico, 

 New Mexico: Chama (Standley 6510, Eggleston 6647). Moist meadows, in the 



Transition Zone. 



9. ANISOLOTUS Bemh. Bird's-foot trefoil. 



Herbaceous annuals or perennials, 50 cm. high or less, generally with numerous 

 rigid and ascending or weak and decumbent or 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. wrightii. 



Flowers in 1 to 3-flowered clusters, the pedimcles usually 



longer than the leaves 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. puberuliLS. 



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. Anisolotiis trispermus (Greene) Woot. & Standi. Contr. U. S. Nat. Herb. 16: 



135. 1913. 

 Lotus trispermus Greene, Erythea 1: 258. 1893. 

 Type locality: Hills bordering the Mohave Desert, California. 

 Range: 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, PI. Wright. 2: 42. 1853. 



Lotus wrightii Greene, Pittonia 2: 143. 1890. 



Type locality: Stony hills at the Copper Mines, New Mexico. Type collected by 

 Wright (no. 1000). 



Range: Colorado to New Mexico and Arizona, south into Mexico. 



