PEA FAMILY 387 



Bibliog. — "Watson, S., North American species of [Lathyrus] (Proc. Am. Acad. 11:133-134, 

 — 1876). White, T. G., Preliminary revision of the genus Lathyrus in North and Central America 

 (Bull. Torr. Club 21 : 444-458, — 1894). Fernald, M. L., Variations of Lathyrus palustris (Ehod. 

 13:47-52, — 1911). Piper, C. V., Some western species of Lathyrus (Proc. Biol. Soc. Wash. 

 31:189-196, — 1918). Bradshaw, K. V., Pacific Coast species of Lathyrus (Bot. Gaz. 80:233-261 

 figs. 1-29,-1925). 



Stems angled. 



Tendrils unbranched or none. 

 Herbage villous. 



Plants decumbent; stipules larger than the leaflets; tendrils none; peduncles longer 



than the leaves, 2 to 6-flowered 1. L. Uttoralis. 



Plants erect ; stipules smaller than the leaflets ; tendrils none or reduced to a point • 



peduncles much shorter than the leaves, 1 or 2-flowered 2. L. torreyi. 



Herbage glabrous or pubescent. 



Leaflets thin, the mucro minute ; tendrils usually simple ; herbage puberulent 



3. L. nevadensis. 

 Leaflets thick, coriaceous, glaucous, the mucro stout and twisted; tendrils none or 



reduced to a point ; herbage glabrous 4. L. rigidus. 



Tendrils long, branched or simple (or minute in var. of no. 5). 



Peduncles not exceeding leaves, usually much shorter; leaflets (in ours) linear to linear- 

 lanceolate, much exceeding the rachis 5. L. lanszwertii. 



Peduncles nearly equaling to much exceeding the leaves; leaflets various, never exceed- 

 ing the rachis. 

 Herbage more or less pubescent ; stipules ^ to % inch long. 



Flowers 12 to 15 lines long, deep red; banner usually completely reflexed 



6. L. splendens. 



Flowers 7 to 11 (rarely to 15) lines long or less, the colors variable; banner 



rarely completely reflexed. 



Lower sinus of calyx wide, the lateral teeth lanceolate to subulate ; corolla 



rose-pink or flesh-color (the banner with purple veinlets), or 



sometimes red 7. L. laetiflorus. 



Lower sinus of calyx narrow, the lateral teeth ovate or lanceolate-oblong; 



corolla dull white, the banner purple-veined or purplish 



8. L. holanderi. 

 Herbage glabrous ; stipules % to 1 % inches long. 



Ovary glabrous ; tendrils branched ; stipules small or large, not resembling the 

 leaflets. 

 Mowers 7 to 10 lines long ; corolla not turning sordid. 



Leaflets 6 to 12, usually coriaceous; racemes 3 to 8-flowered; calyx- 

 teeth glabrous 9. L. pauciflorus. 



Leaflets 10 to 20, not coriaceous; racemes stout, 5 to 10-flowered; 



calyx-teeth ciliate 10. L. polyphyllus. 



Flowers 5 to 6 lines long; racemes slender, 7 to 19-flowered; corolla turn- 

 ing sordid 11. L. sulphureus. 



Ovary pubescent ; tendrils mostly unbranched ; stipules as large as and simulat- 

 ing the leaflets 12. L. maritimus. 



Stems winged ; tendrils long, branched. 



Leaflets 2 to 6; racemes 2 to 6-flowered; herbage glabrous or puberulent 13. L. palustris. 



Leaflets 8 to 12 ; racemes 6 to 15-flowered. 



Herbage puberulent ; stipules ^ to % inch long 14. L. watsonii. 



Herbage glabrous or nearly so; stipules ^/^ to 1% inches long 15. L, jepsonii. 



1. L. littoralis Endl. Beach Pea. Stems many from creeping rootstoeks, 

 decumbent, 6 to 15 inches long; herbage densely silky- villous, suggestive of a hairy 

 Lupine; leaflets 1 to 3 pairs with a usually smaller or imperfect terminal one, 

 cuneate-oblong, 4 to 6 lines long; stipules ovate or somewhat hastate, 1 14 to 2 times 

 as large as the leaflets; peduncles exceeding the leaves; calyx-teeth nearly equal, 

 as long as the tube; corolla 6 to 8 lines long; banner purple, the keel and wings 

 white or nearly so ; pods oblong, 1 inch long, villous, 3 to 5-seeded. 



Seabeaches and sand dunes : Monterey Co. to Humboldt Co. North to Wash- 

 ington. Apr.-Oct. 



Locs. — Monterey, ace. W. S. Cooper; Natural Bridge, Santa Cruz Co., Anderson; Moss 

 Beach, near Halfmoon Bay, K. Brandegee; San Francisco, Jepson 2638, 10,242; Humboldt Bay, 

 Tracy 2451. 



