SUNFLOWER FAMILY. 495 



Heads turbinate in mature fruit; paleae narrowly lanceolate, tapering 

 into and longer than the awn ... . .6.U. acuminata. 



1. M. attenuate G-reene. Scapes rather few, suberect, 11 to 15 in. 

 high; leaves in the radical cluster few, mostly pinnately parted into 

 narrow linear lobes; involucre ^ in. high, barely calyculate at base; 

 pappus 3 to 3^ lines long, equaling or a trifle longer than the achenes; 

 paleae oblong or ovate, J to J the length of the awn, externally either 

 lightly or conspicuously villous. 



Solano Co. to Alameda Co. Apr.-May. 



2. M . aphantocarpha Gray. Scapes decumbent at base or wholly 

 erect, 10 to 16 in. high; leaves subentire or pinnatifid; involucre 

 merely calyculate; achenes slender, 2 to 2J lines long; pappus-bristles 

 3 to 4 lines long, not obviously dilated at base, slender, fragile or 

 deciduous. 



Contra Costa Co. to Southern California. First collected by 

 Brewer, no. 1206, on Bushy Knob, southeast of Mt. Diablo. 



Var. tenella Gray. Pappus-bristles commonly but 2 or 3, with 

 a manifestly ovate palea at base. — Napa Valley; Lower Sacramento 

 Valley and southward. Occasionally destitute of pappus (ace. to 

 Greene). 



Var. indivisa (M. indivisa Greene). Scapes strictly erect; leaves 

 oblanceolate, entire, or a few toothed or pinnatifid; outer row of 

 achenes silvery-silky; pappus-bristles 4 to 5 lines long, the palese 

 triangular. — Plains of Solano Co. about Elmira. Last of .A.pr.-May. 



3. M. elegans Greene. Scapes slender, decumbent at base, com- 

 monly 4 to 7 in. high; head in fruit less than J in. high; achenes 

 little more than 1 line long, tapering gradually from the summit to 

 the base; palese of the pappus ovate-deltoid , either obscurely emargi- 

 niwte or more attenuate into a slender awn about 4 times as long, 

 the palea and the summit of the achene sometimes minutely villous. 



Solano Co., where it is very common on the plains, to Contra 

 Costa Co. 



4. M. Douglasii Gray. Scapes 8 to 17 in. high; leaves in the 

 rosulate radical cluster many, pinnatifid; heads broadly ovoid, or in 

 age hemispherical, 9 or 10 lines high; achenes oblong-turblnate, 

 thickish, obviously contracted under the summit, nearly 2^- lines 

 long, the outermost usually white-villous; palese of the pappus ovate 

 to orbicular, 2 lines long and nearly as broad, scarious, commonly 

 imbricated or convolutely overlapping, abruptly acute or retuse at the 

 apex, J to J as long as the awn, glabrous or villous externally. 



Common from Solano Co. and J^apa Valley to Berkeley and south- 

 ward. Apr.-May. Specimens from the Montezuma Hills show 

 central achenes with only 1 or 2 paleaceous awns. 



5. M. Bigelovii Gray. Often 1 ft. high or more; leaves entire or 

 pinnatifid; head broadly ovate, J in. high; involucre disposed to be 

 somewhat imbricated; achenes oblong-turbinate, 2 lines long, not 

 contracted under the truncate summit, the outermost sometimes 

 villous; pappus brownish or almost rusty, the pale* oblong- to ovate- 



