456 
Original locality: Kamassa prairies. 
Type in Herb. Col. Coll. 
28. LaTHYRUS DECAPHYLLUS Pursh, Fl. Am. Sept. 471 (1814). 
Vicia stipulacea Pursh, Fl. Am. Sept. 739 (1814). 
Lathyrus polymorphus Nutt. Genera, 2: 96 (1818). 
Lathyrus myrtifolius Spreng. Syst. 3: 264 (1826), not of Willd. 
Orobus polymorphus Alefeld, Bonplandia, g : 146 (1861). 
‘Idaho, Colorado, Arizona and New Mexico. 
Original locality: Banks of the Missouri River. 
This spiecies is very close to L. ornatus and differs from it 
chiefly in the size of the plant and its leaflets and in geographic 
distribution. Intermediate forms occur. 
29. Latuyrus Nurratyi S. Wats.; Proc. Am. Acad. 21: 450 
(1886). 
Lathyrus venosus Muhl., var. 5, T. & G. Fl. N. A. 3: 274 
(1838). 
British Columbia, Washington, Oregon, California. 
Original locality: “« Upper California,” Nuttall. 
Type in Herb. Col. Coll. Duplicate in Gray Herb. 
This species is very close in general appearance to L. obovatus . 
but the distinction has been drawn on its being somewhat 
stouter, thé leaflets narrower, and usually 4 pairs instead of 3. parr 
flowers smaller and purple instead of ochroleucous, and rachis ev 
dril-bearing. Both species were formerly referred to the Eastern 
venosus, which, however, so far as I know, does not occur west | 
of the Rocky Mountains. 
30. Latuyrus OREGONENSIS n. sp. Seen 
Sparingly pubescent throughout, erect, 20-40 cm. high, pase 
ous, stem terete or quadrangular, wingless, rigid; stipules nok a 
semi-saggitate or semi-hastate, acuminate at each end a aa 
lower lobe often quite short, 4-14 the length of the adjacen' ie : 
lets; leaflets mostly 4-7 pairs, opposite, lanceolate, obtuse, ae 
4.5 cm. long, 2-8 mm. broad, coriaceous, sparingly pubes ates 
both surfaces ; tendrils short, branched or reduced to 4 aowets 
raceme 3-8-flowered, shorter than the rachis of its leaf; Be the 
apparently purple and veined, 1-1.5 cm. long; pedicel or 
length of the calyx-tube; calyx-teeth subequal, the eh 
slightly shorter, all shorter than the tube; Segara ‘tef- 
_ pubescent, purplish at base; legume compressed, abrul pa 
