PEA FAMILY. 225 



or ascending, % to 1% ft. high; stems slender; stipules ovate, laciniately 

 toothed; leaflets very small to large, obovate to oblong-lanceolate; peduncles 

 slender; heads small, few to many-flowered; involucre much smaller, 4 to 12- 

 lobed, the lobes 3 to 7-toothed; flowers small, purple, white-tipped or purple 

 throughout ; calyx 5 to 20-nerved, its teeth subulate-setaceous, simple or one 

 tooth bifid. 



Widely distributed and common throughout California. Var. pauciflorum 

 McDer. Dwarf, caespitose or stems short and slender; leaflets very small; 

 heads of 1 to 7 small purplish floAvers; involucre 1 to 4-lobed, the lobes 3 to 

 5-toothed. — Mendocino, Marin and Monterey cos. ; also in the Sierra Nevada. 

 The smallest clover of western North America (T. pauciflorum Nutt.) Var. 

 trilobatum Jepson. Slender, 4 to 8 in. high, sparsely branched at the base; 

 margin of stipules laciniate; petioles slender, 1% to 2 in. long; leaflets lanceo- 

 late, acute at each end or often remarkably trilobate at apex; heads on long 

 slender peduncles; lobes of involucres deeply and laciniately toothed; flowers 

 long, dark purple, cream color at the tips; calyx-teeth slender, acute, generally 

 purple-tipped ; pod 2-seeded. — A beautiful but rare variety collected at the 

 Marysville Buttes (T. trilobatum Jepson). Var. melaxaxthum Greene. 

 Leaflets large, oblanceolate, obtuse; heads large-flowered, showy; involucre 

 small; calyx-teeth pungent and purple-tipped. — Common in low moist places, 

 attaining a most luxuriant growth. Var. melaxaxthum forma major 

 McDer. A large stout and fistulous form; leaflets large, acute at each end; 

 heads large; petals purple, white-tipped. — Common in low moist places, 

 especially luxuriant in the Bay region. 



T. polyodox Greene. Glabrous, somewhat decumbent; stems flaccid, 1 to 

 1% ft. high; stipules laciniate, the margins reflexed; leaflets rhombic, entire 

 to serrulate; involucre not deeply lobed, each lobe many-toothed; heads 5 

 lines in diameter; flowers dull purple fading to white at the top; calyx tur- 

 binate, 10-nerved, reticulate, all the teeth tridentate or multifid; pod 2-seeded; 

 seeds brown-speckled. — Distinctly local. Pacific Grove; Monterey. 



8. T. oliganthum Steud. Slender, % to 1% ft. high; herbage glabrous, 

 light green ; leaflets linear to cuneate-oblong, serrate-setate to entire ; heads 

 very small, 3 to 15-flowered; involucre much smaller, divisions deeply laciniate 

 and unequal; flowers small, lavender, white-tipped; keel purple; calyx-teeth 

 broadly subulate; pod 2 to 3-seeded. 



Wooded canons and brush-covered slopes of the Coast Eanges. Limited 

 in range. Not common. Forma soxomexse McDer. Stipules and in- 

 volucres sparsely short pubescent. — Knights Valley, Sonoma Co. Var. tricho- 

 calyx McDer. Peduncles and heads covered with a white pubescence; leaflets 

 obcordate or rhombic, 1% to 5 lines wide, 2 to 8 lines long. — Pacific Grove 

 (T. trichocalyx Heller). 



9. T. microdon H. & A. Stems stout, erect, % to 2 ft. high, the secondary 

 branches slender, covered with inconspicuous hairs; leaflets broadly obcordate 

 or oblanceolate, serrate-setate, 5 to 9 lines long; stipules ovate-lanceolate; 

 involucre deeply campanulate, becoming flattened at anthesis, 5 to 15-lobed; 

 lobes prominent, green, 3 to 7-toothed; flowers small, white or turning light 

 pink; calyx-teeth short, abruptly subulate; pod 1-seeded. 



Very common throughout our region. Apr.-May. 



10. T. barbigerum Torr. Procumbent, 4 to 8 in. long; stems several 

 from the base, spreading in a circle; peduncles erect, slender, wiry, pubescent 

 to glabrous; stipules scarious, ovate-lanceolate, upper portion green; leaflets 

 rhombic or deltoid to ovate-oblong, the margin setate; heads numerous, the 



