498 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



1. Flowers in peduncled racemes or, if solitary, then the peduncle well developed 

 and the corolla less than 10 mm. long; calyx teeth much shorter than the 

 tube, except sometimes in V. leucophaea (2). 

 2. Corolla 15 to 25 mm. long, purple; plant glabrous or sparsely (rarely copi- 

 ously) pubescent; leaflets mucronate or cuspidate; racemes 2- to several- 

 flowered 2. V. AMERICANA. 



2. Corolla less than 10 mm. long (3). 



3. Peduncle bearing several (usually 10 or more) flowers; corolla 5 to 7 mm. 

 long, cream white, often with the banner purple-veined and the keel 



purple-tipped 3. V. pulchella. 



3. Peduncle bearing 1 or 2 flowers (4). 



4. Stems, leaves, and calyx sparsely to copiously villous; pods sericeous; 

 corolla 8 to 9 mm. long, whitish, the veins of the banner and the tip 



of the keel purple 4. V. leucophaea. 



4. Stems, leaves, and calyx sparsely pubescent with mostly appressed hairs 

 or glabrate; pods glabrous; corolla commonly less than 8 mm. long' 

 usually pale blue or purplish 5. V. exigua' 



1. Vicia sativa L., Sp. PL 736. 1753. 



An occasional escape from cultivation, as at Sacaton (Pinal County), 

 but apparently not established anywhere in Arizona. Common in 

 the eastern United States; naturalized from Europe. 



2. Vicia americana Muhl. ex Willd., Sp. PL 3: 1096. 1803. 



Vicia perangusta Greene, Leaflets 2: 267. 1912. 

 Vicia hypolasia Greene, ibid. p. 268. 



Apache County to Coconino County, south to Cochise and Pima 

 Counties, 5,000 to 10,000 feet, common, especially in pine forests, 

 May to September, type of V. perangusta from the Tusayan (now the 

 Kaibab) National Forest (Read in 1912), type of V. hypolasia from the 

 Chiricahua Mountains (Blumer 1348). Canada to Virginia, New 

 Mexico, Arizona, and California. 



Flowers large and handsome for the genus. A polymorphic species, 

 several forms of which have been segregated as species. About 

 equally common in Arizona are (1) the typical form of the species, 

 with relatively thin and broad leaflets, these 4 to 10 mm. wide, 

 rounded to acutish at apex; and (2) var. linearis (Nutt.) Wats., with 

 usually rather thick and prominently veined leaflets 1 to 4 mm. wide. 

 The var. truncata (Nutt.) Brewer, with relatively thin and broad 

 leaflets that are truncate and often emarginate and denticulate at 

 apex, is less common but not rare, apparently confined to the northern 

 and central parts of the State. All of these forms intergrade freely. 



3. Vicia pulchella H. B. K., Nov. Gen. et Sp. 6: 499. 1824. 



Vicia melilotoides Woot. and Standi., Contrib. U. S. Natl. 

 Herbarium 16: 141. 1913. 



Apache County to Coconino County, south to Cochise and Pima 

 Counties, 6,000 to 8,500 feet, frequent in pine forests, July to Septem- 

 ber. Western Texas to Arizona and throughout Mexico. 



The stems often are so thickly matted as to be subject to mildew. 



4. Vicia leucophaea Greene, Bot. Gaz. 6: 217. 1881. 



Southern Apache County to Cochise and Pima Counties, 5,500 to 

 8,000 feet, pine forests, July to September. Western New Mexico 

 and southeastern Arizona. 



