HELENIOIDEl!. 205 



8. L. tenella (Nutt.). Erect, sparingly branching, 4—6 in. nigh, 

 somewhat canescent with deciduous woolly hairs: leaves linear, entire, 

 or some of the lower laciniate: rays oval or oblong, short: pale®, and 

 awns each usually 2, but pappus not rarely wholly wanting. — Low 

 plains of Contra Costa Co. April, May. 



9. L. uliginosa (Nutt.). Stouter than the last, freely branching, 

 often decumbent, somewhat flocculent: leaves linear-ligulate, the lower, 

 if any, entire, the upper laciniate-pinnatifid into linear entire or cleft 

 segments: involucral bracts and long-exserted rays 10 — 13: pappus of 

 about 4 slender awns, and as many or twice as many broad truncate 

 laciniate-fimbriate palese. — Common in low grounds. April, June. 



10. L. microglossa (DC). Slender, seldom 6 in. high, branching 

 from the base but erecV leaves entire, pubescent: involucre narrow and 

 nearly cylindrical: rays few, very short and inconspicuous: achenes 

 linear-fusiform, flattish, minutely and sparsely hispid; pappus of 2 — 4 

 rather rigid awned or awn-like scales, or in the ray sometimes none. — 

 Valleys among the coast mountains southward. April, May. 



+- -t— Pappus usually present and uniform, of aivned palese or 



paleaceous-dilated awns; leaves mostly entire. 



++Somewhal succulent; pubescence woolly, if any. 



11. L. platycarpha (Gray). Purplish-stemmed and very wiry, 5 — 8 

 in. high, with erect or ascending branches: leaves linear, or pinnatifid 

 into filiform segments: involucral bracts 6 or 7, S-nerved, the middle 

 nerve carinately prominent: pappus-palese bright-white, ovate, slender- 

 awned, the awn as long as the achene. — Subsaline plains of Solano and 

 Contra Costa counties. April, May. 



12. L. car nosa (Greene). Leaves all filiform, entire: bracts of invo- 

 lucre with a single strongly carinate nerve: pappus of 4 or 5 subulale- 

 awned ovate palese. — Border of salt marsh north of Vallejo: rare or 

 local. April. 



++++ Not succulent; leaves entire ; (except in n. 15) pubescence not woolly. 

 = Pappus invariably none; achenes subclavate. 



13. L. chrysostoma (F. & M.). Hirsutulous, 1 ft. high more or less, 

 freely branching: leaves narrowly linear: head 3 — 4 lines high: bracts of 

 involucre, and the rays, 7—12, the latter 3 — 4 lines long: achenes gla- 

 brous.— Rich fields and sunny slopes. April, May. 



14. L. macrantlia (Gray). Perennial, stout and nearly simple, decum- 

 bent at base, with peduncles 4—8 in. long: leaves somewhat 3-nerved 

 and obtuse, linear, 4 8 in. long, hispid- ciliate toward the base: heads % 

 in high and as broad: involucre of about 12 hirsute-pubescent thickish 

 herbaceous bracts: ligules %— 34 in. long.— Moist lowlands of western 

 Marin Co., and northward. June. 



