440 MISC. PUBLICATION 4 2 3, U. S. DEPT. OF AGRICULTURE 



June, type from the Chiricahua Mountains (Blumer 1357). Appar- 

 ently endemic in southeastern Arizona. 



With the exception of L. latifolius, this is the largest-flowered of the 

 Arizona lupines and is very showy in flower, according to Blumer. 

 The leaflets are up to 15 mm. wide. 



21. Lupinus sitgreavesii S. Wats., Amer. Acad. Arts and Sci. Proc. 

 8: 527. 1873. (As L. sitgreavii). 



Lukachukai and White Mountains (Apache County) , San Francisco 

 Peaks and vicinity (Coconino County), 6,700 to 8,000 feet, open conif- 

 erous forests, July to October, type from the San Francisco Peaks 

 (Sitgreaves in 1851). Reported to occur also in southern Utah and 

 western New Mexico. 



This species seems ill-defined, differing from L. argenteus as here 

 interpreted chiefly in the more spreading pubescence. What appears 

 to be a glabrate form of L. sitgreavesii, although referred by Smith 

 (see footnote 66, p. 434, Smith, p. 136) to L. alpestris A. Nels., was col- 

 lected between Springerville and Cooley Ranch, Apache or Navajo 

 County (Ferris 1273). 



18. MEDICAGO. Medick 



Plants herbaceous, annual or perennial; leaves trifoliolate, the 

 leaflets dentate; flowers small, in axillary racemes or heads; calyx 

 nearly regular; corolla yellow or violet; stamens diadelphous (1 

 separate from the other 9), the anthers all alike; pods indehiscent, 

 strongly curved or spirally coiled. 



All of the species are natives of the Old World. Alfalfa (M. sativa) 

 is, of course, the outstanding cultivated forage plant of the western 

 United States and the other weedlike species afford nutritious and 

 palatable feed, although not sufficiently abundant in Arizona to be 

 important. M. hispida is much used in California as a winter cover 

 crop and green-manure crop. 



Key to the species 



1. Plant perennial; stems erect; corolla violet; flowers numerous, in rather dense 

 racemes; pods spirally coiled, several-seeded, unarmed, glabrous. 



1. M. sativa. 

 1. Plants usually annual; stems procumbent; corolla yellow; pods strongly 

 veined (2). 

 2. Pods kidney-shaped, coiled in 1 plane, 1-seeded, pubescent, without mar- 

 ginal prickles or tubercules, black at maturity ; flowers rather numerous, 



in ovoid spikes, these becoming oblong in fruit 2. M. lupulina. 



2. Pods spirally coiled, several-seeded, glabrous, with marginal hooked prickles 

 or tubercles, straw-colored at maturity; flowers few, in subcapitate 

 clusters (3). 



3. Marginal prickles long 3. M. hispida. 



3. Marginal prickles very short or reduced to tubercles.-- 4. M. apiculata. 



1. Medicago sativa L., Sp. PL 778. 1753. 



Carrizo Mountains (Apache County), San Bernardino Ranch and 

 Chiricahua Mountains (Cochise County), an occasional escape from 

 cultivation but apparently nowhere naturalized in the State. 



Alfalfa, lucerne. 



2. Medicago lupulina L., Sp. PL 779. 1753. 



Navajo, Gila, and Yavapai Counties, 4,000 to 6,000 feet, occasional 

 at roadsides, etc. 



