Lathyrus 



Leguminosae 



617 



50 



Map 1268 



Vicia amencana Muhl 



Jan. 



Feb. 



Mar 



Apr. 



May 



June 



July 



Aug 



Sept. 



Oct. 



Nov. 



Dec. 



Map 1269 

 Lathyrus ochroleucus Hook. 



To 



Map 1270 

 Lalhyrus japonicus 

 var glaber (Ser.) Fern 



found at the base or on the lower part of black and white oak slopes. In 

 the southern part of the state it is locally frequent on wooded slopes in 

 black and white oak woods. It can be found, no doubt, in all of the hilly 

 counties and in more of the counties of the lake area. 

 Ont. to Wis., southw. to Ga. and La. 



3. Vicia americana Muhl. American Vetch. Map 1268. Infrequent 

 throughout the lake area in marshes, along moist roadsides, and on the 

 low borders of lakes. Smith's report from Clark County should be referred 

 to the preceding species. This species is often confused with Lathyrus 

 palustris. (See that species for discussion.) 



N. Y. to B. C. and the Pacific coast, southw. to Va. and N. Mex. 



3854. LATHYRUS [Tourn.] L. Pea 



Leaflets more than 2. 



Whole plant more or less densely pubescent with short, weak hairs; leaflets ovate, 

 lance-ovate or elliptic, mostly (8) 10-14, the largest on different plants varying 

 from 18-25 mm wide and 35-50 mm long; peduncles 17-30-flowered; flowers 



about 15 mm long 3a. L. venosus var. intonsus. 



Whole plant glabrous except sometimes the calyx lobes ciliate and the upper sur- 

 face of the petiolules of no. 5 and varieties puberulent. 

 Longest petioles 2-4 cm long; leaflets glaucous beneath, of an ovate type, 18-28 

 mm wide and 35-55 mm long; petiolules glabrous; peduncles 2-12-flowered; 



flowers yellow 1. L. ochroleucus. 



Longest petioles less than 2 cm long; flowers purplish. 



Leaflets mostly 8-12, of a broad type, mostly 35-60 mm long and 15-28 mm 

 wide; peduncles usually 7-25-flowered. 

 Leaflets green on both sides, conspicuously veiny; stipules large, the largest 

 almost half the length of the leaflet above it; peduncles mostly 7-10- 



flowered 2. L. japonicus var. glaber. 



Leaflets paler beneath, not conspicuously veiny; stipules much less than half 

 the length of the leaflets above them; peduncles mostly 10-30-flowered. 



3. L. venosus. 



Leaflets mostly 4-8, linear, lanceolate, elliptic, or of an ovate type; peduncles 

 3-9-flowered. 



