SUNFLOWER FAMILY. 



563 



ing base; heads 7 to 8-flo\vered, 3 or 4 lines long, terminating diffuse 

 slender branchlets; involucre turbinate or campanulate, 10 to 20 or 

 25-flowered; corollas short, purple; pappus-bristles longer than the 

 achene, 20 or more, sometimes more or less coalescent at base into sets. 



Dry hills of the North Coast Ranges: Mt. Tamalpais; Cordelia; 

 Howell Mountain and northward. Sept. 



4. L. virgata Gray. Stem and virgate branches rigid; herbage 

 more densely woolly; upper leaves appressed, concave, carinately 

 nerved; heads solitary and sessile in the axil of a leaf of nearly the 

 same length, thus forming a somewhat spicate inflorescence; involucre 

 cylindrical, woolly, 5 to 7-flowered. 



Plains of the Sacramento. 



5. L. leptoclada Gray. Simple below, branching above, 2 ft. 

 high; lower leaves denticulate, those of the branchlets ovate or 

 lanceolate with somewhat sagittately adnate base; branchlets virgate 

 and almost filiform, bearing few or solitary heads; involucre turbinate; 

 bracts in many ranks, greenish at tip and cuspidate; corollas con- 

 spicuously exserted. 



San Mateo Co., and northward. 



6. L. hololeuca Greene. Stem erect, with rigidly ascending 

 branches, nearly 2 ft. high, the whole plant even to the involucres 

 white-tomentose; leaves all entire, the basal ones spatulate and 

 narrowed to a long petiole; cauline leaves oblong or ovate, sessile 

 and almost cordately clasping; rameal ones small; all the leaves and 

 the bracts of the involucre ending in a short spinescent tip; heads 

 turbinate; corollas red-purple; pappus-bristles rufous. 



Low hills of Sonoma Co., Greene. Too near L. ramulosa. 



7. L. adenophora Greene. Repeatedly branched from the base, 

 forming a densely bushy plant 1 ft. high or a little more; lower 

 leaves round-ovate to oblong, somewhat cordately sessile, densely 

 woolly above, glabrate beneath; margins of the leaves (particularly 

 of the upper) densely beset with small stipitate glands; heads numer- 

 ous, 7 to 10-flowered, on filiform branchlets; bracts of the narrowly 

 campanulate or almost cylindrical involucres very acute, suberect, 

 more or less glandular like the leaves, the inner chartaceous, purplish, 

 bristle-pointed; corollas red-pur.ple; pappus-bristles united into 4 to 7 

 paleaceous sets, each set composed of a single stout bristle or of 2 or 3 

 bristles, united for nearly their whole length, or only at base. 



Mountains of the North Coast Ranges: northern Napa Co.; Lake 

 Co.; Colusa Co., acc. to Gray. July-Aug. 



8. L. nana Gray. Depressed, dwarfish, the whole plant densely 

 tomentose with thick wool; stems 2 to 4 in. long, flowering from near 

 the ground; heads 10 to 12-flowered and nearly £ in. long, subtended 

 by oblong or lanceolate leaves; outer bracts of involucre linear- 

 lanceolate, somewhat herbaceous; inner bracts pearly white, tapering 

 into a long awn which conspicuously equals or exceeds the flowers 

 and the dark red pappus; achenes very short and turgid. 



Sandy plains and foothills on the eastern side of the Sacramento 

 and San Joaquin Valleys. Aug. 



