PEA FAMILY 619 



1. Lathyrus Aphaca L. Yellow Vetchling. Fig. 2936. 



Lathyrus Aphaca L. Sp. PI. 729. 1753. 



Annual, with slender twining stems, 2-8 dm. high, glabrous throughout. Stipules large, 

 simulating simple opposite leaves, broadly sagittate-cordate, 1-3 cm. long ; leaflets none ; tendril 

 simple, usually exceeding the stipules ; peduncles slender, about as long as the tendrils, 1-flowered 

 or rarely 2-flowered ; flowers 6-9 mm. long, yellow ; pods flat, 20-25 mm. long, 4-7-seeded. 



Roadsides and waste places; naturalized from Europe and becoming established about the principal cities 

 in the Willamette Valley, Oregon, also in Napa County, California. April-June. 



2. Lathyrus pusillus Ell. Low Vetchling. Fig. 2937. 



Lathyrus pusillus Ell. Bot. S.C. & Ga. 2: 223. 1823. 



Annual, glabrous, stems slender, narrowly winged, 3-6 dm. high. Leaflets 2, linear or nar- 

 rowly oblong, 1-5 cm. long; tendril simple or branched; peduncles mostly shorter than the 

 leaves, usually 1-2-flowered; flowers 8-10 mm. long, purple; pod linear, 2-4 cm. long, glabrous. 



Native of the eastern and southeastern United States; locally established in the Willamette Valley, Oregon. 

 April-May. 



3. Lathyrus latifolius L. Everlasting Pea. Fig. 2938. 



Lathyrus latifolius L. Sp. PI. 733. 1753. 



Perennial, glabrous; stems stout, winged, climbing, 1-2 m. high. Stipules lanceolate, often 

 2.5 cm. long; petioles winged, 2-3 cm. long; leaflets 2, ovate-lanceolate to lanceolate, 4-7 cm. 

 long ; peduncles longer than the leaves, many-flowered ; flowers purple or white, 20-25 mm. long. 



Occasionally appearing as an escape from gardens in western Oregon and northern California. Native of 

 Europe. May-July. 



Lathyrus hirsutus L. Sp. PI. 732. 1753. Rough Pea. Annual, the nascent parts somewhat hairy; stems 

 branching from the base, 6 dm. or more high, strongly winged on the angles. Stipules narrowly linear-lanceolate, 

 10-15 mm. long; leaflets 2, linear-lanceolate, 4-7 cm. long; tendrils well-developed, branched; peduncles longer 

 than the leaves, 1-2-flowered; corolla red, about 7 mm. long; pod flat, villous-hirsute. Locally established in the 

 Willamette Valley, Oregon. Native of Europe. 



Lathyrus tingitanus L. loc. cit. Tangier Pea. Glabrous annual, with stout winged stems, 1-1.5 m. high. 

 Leaflets 2, linear to narrowly lanceolate, 3-6 cm. long, strongly veined; peduncles commonly 2-flowered; flowers 

 about 25 mm. long, deep red-purple. Escaped from gardens and becoming locally established in the Willamette 

 Valley, Oregon. Native of the western Mediterranean region. 



Lathyrus odoratus L. loc. cit. Sweet Pea. Stems rough-hairy, winged. Leaflets 2, oval or oblong; peduncles 

 much longer than the leaves, 2-4-flowered; flowers showy, variable in color, very fragrant. Escaped from 

 gardens and locally established in California. Native of Italy. 



4. Lathyrus littoralis (Nutt.) Endl. Silky Beach Pea. Fig. 2939. 



Astrophia littoralis Nutt. in Torr. & Gray, Fl. N. Amer. 1 : 278. 1838. 

 Lathyrus littoralis Endl. ex Walp. Rep. 1 : 722. 1842. 

 Orobus littoralis A. Gray, Pacif. R. Rep. 4: 58. 1856. 



Perennial, densely silky-villous throughout, stems several, stout, decumbent, 2-6 dm. long. 

 Leaflets 2-10, oblanceolate, 5-20 mm. long; stipules ovate, much larger than the leaflets; tendril 

 rudimentary or none ; peduncles 4-9 cm. long, surpassing the leaves ; flowers 4-10, purple or 

 white, about 2 cm. long ; calyx-teeth lanceolate ; pods 3 cm. long, 1 cm. broad, densely villous. 



Sand dunes and beaches along the coast, Canadian and Transition Zones; Washington to central California. 

 Type locality: sand hills of the estuary of the Oregon. April-June. 



5. Lathyrus Torreyi A. Gray. Torrey's or Redwood Pea. Fig. 2940. 



Lathyrus Torreyi A. Gray, Proc. Amer. Acad. 7: 337. 1867. 



Lathyrus Torreyi var. tenellus Wiegand, Bull. Torrey Club 26: 135. 1899. 



Perennial, minutely villous, the stems slender, branching from slender creeping rootstocks, 

 erect, 1-4 dm. high. Leaflets 8-14, ovate to oblong-lanceolate, acute or obtuse, mucronate, 8-15 

 mm. long, rather thin, paler beneath; stipules small, semisagittate, lanceolate-subulate, entire; 

 tendrils reduced to a short bristle-like prolongation; peduncles very slender, 8-40 mm. long, 

 1-2-flowered ; calyx-teeth very unequal, the lower three subulate and longer than the tube ; corolla 

 15 mm. long, the standard bluish purple, the other petals nearly white; pods 15-20 mm. long, 

 pubescent. 



Open woods, mainly Transition Zones; western Washington to the Coast Ranges of central California. Type 

 locality: Mendocino or southern part of Humboldt County, California. April-July. 



6. Lathyrus Cusickii S. Wats. Cusick's Pea. Fig. 2941. 



Lathyrus Cusickii S. Wats. Proc. Amer. Acad. 17: 371. 1882. 



Perennial, glabrous or sparsely pubescent, the stems slender, erect or ascending, 2-4 dm. high. 

 Leaflets 4-6, linear-lanceolate to narrowly linear, 3-6 cm. long ; stipules semisagittate, narrowly 

 lanceolate, 10-15 mm. long; tendrils none; peduncles slender, about as long as the leaves, 2-3- 

 flowered ; flowers about 2 cm. long, white ; pods 4-5 cm. long. 



Open coniferous forests and dry mountain slopes, Canadian Zone; Blue Mountains, Oregon. Type locality: 

 "On dry mountain slopes, Union County, Oregon." May-June. 



7. Lathyrus bijugatus White. Latah Pea. Fig. 2942. 



Lathyrus bijugatus White, Bull. Torrey Club 21 : 457. 1894. 



Perennial, glabrous, the stems erect, slender, branching from the base, 1-3 dm. high. Leaflets 

 usually 2-4, oblong to elliptic, acute, 2-4 cm. long ; tendrils reduced to a minute bristle ; stipules 



