PEA FAMILY. 223 



Plant large. 



Calyx sparsely pubescent; flowers tinged with pink 17. T. hybrid urn. 



Calyx characteristically hairy, strongly cross-nerved at base of teeth; flowers rose-red.. 



18. T. pratense. 

 2. Flowers sessile, never reflexed; annuals. 



Heads pedunculate, elongate-ovate, small 19. T. albopurpnreum. 



Heads sessile, in pairs 20. T. macraei. 



Heads large, globose. 9 



Corolla large, showy, much longer than the calyx 21. T. dichotomum. 



Corolla small, inconspicuous, entirely obscured by the long and plumose calyx-teeth... 



22. T. olivaccum. 

 Heads long cylindrical, truncate; flowers showy 23. T. calif omicum. 



1. T. fucatum Lindl. Sour Clover. Stems stout, fistulous, succulent, 

 diffuse, 1 to 2% ft. long; stipules large, broadly subulate, acuminate, the 

 margins membranous; leaflets rhombic-ovate, 5 to 12 lines broad, broadly den- 

 tate, sometimes dentate-setate ; heads large, 1 to 1% in. in diameter; in- 

 volucre 5 to 9-lobed, its margins scarious, entire ; flowers pedicellate, cream- 

 color tinged with light green, in age inflating and turning a deep pink; keel 

 dark purple; calyx very small, scarious, the teeth short, unequal; pod stipitate, 

 3 to 8-seeded, the seeds 1 line in diameter. 



A most singular species, found throughout California, growing rankly in 

 low alkaline and brackish places. Acts much like a weed, since abundant 

 along railroad tracks and country roads. Possibly introduced from South 

 America. Apr. -June. Forma virescens McDer. Smaller; leaflets spatulate, 

 pectinate to pectinate-dentate; calyx-teeth reduced to 3, longer than the calyx- 

 tube; pod 3-seeded. — Dry hilly parts of Napa, Solano and Colusa cos. (var. 

 virescens Jepson.) Var. gambellii Jepson. Procumbent and very succu- 

 lent; leaflets rhombic, thick, glaucous; calyx-teeth very long, 2 to 3-cleft. — 

 Inner South Coast Ranges. Forma flavulum McDer. Of the same pro- 

 cumbent habit as var. gambellii; leaflets small, the margins entire; calyx- 

 teeth simple, equaling or exceeding the calyx-tube. — Widely and abundantly 

 distributed in marshy places of the sea-coast counties (var. flavulum Jepson). 



2. T. depauperatum Desv. Slender, glabrous, ascending, 4 to 8 in. high ; 

 stipules ovate, lanceolate; leaflets cuneate-emarginate, denticulate, 5 lines 

 long; peduncles slender, wiry; heads loose, 2 to 7-flowered, subtended by an ex- 

 ceedingly small involucral ring; banner enclosing the small wings and keel; 

 pod stipitate, 2 to 6-ovuled, commonly 2-seeded. 



The most abundant clover of the alkaline areas of California. Owing 

 to the variation of the involucre and leaflets we have the following varieties 

 and forms : Forma lacixiatum McDer. A leaf form growing near or 

 partly in water; leaflets deeply and laciniately toothed. — Not so abundant as 

 the species (var. laciniatum Jepson). Var. diversifolium McDer. Larger 

 than the species, 1 to 2 ft. high; leaflets oblong-ovate; margins repandly serru- 

 late toward the apex; involucre very small, with 6 to 9 tiny lobes; heads many 

 (8 to 15) -flowered. — More common than the species (T. amplectens var. hy- 

 drophilum Jepson.) Var. stexophtllum McDer. Very slender; leaflets 

 linear. 5 to 9 lines long, y± to % line broad. — A coast form from Sonoma to 

 San Diego Co. (T. stenophyllum Nutt.) Var. stexophtllum forma frax- 

 ciscaxum McDer. Dwarf, the small leaflets as broad as long, rounded at 

 the apex. — Same localities as the last (T. franciscanum Greene). Var. stexo- 

 phtllum forma lacixifolium McDer. Leaflets laciniately toothed; lobes of 

 the involucre highly developed as in var. stenophyllum. — Xot common. Mar. 

 Var. amplectens McDer. Stout, 1 to 1% ft. high; involucre large, 5 to 6- 

 lobed, the lobes rounded, margin scarious. — Abundant on the plains of the 



