500 



COMPOSITE. 



ifid; ligules elongated and conspicuous; achenes toothed at the apex 

 of the body and abruptly beaked; pappus dull white. 

 Interior districts. Apr.-May. 



2. A. heterophylla (Nutt.) Greene. Peduncles slender, 5 to 12 in. 

 high, often numerous; leaves linear to spatulate or oblong, entire, den- 

 ticulate, or sinuate-pi nnatifid, villous-pubescent; ligules short, incon- 

 spicuous; involucre campanulate; bracts lanceolate-acuminate, the 

 inner glabrous; achenes ribbed or the inner smoothish or merely 

 nerved, 2 lines long or less, tapering into a filiform beak 1^ to 3 

 times as long, and commonly longer than the whitish pappus; fruit- 

 ing heads about f in. high.— (Troximon heterophyllum Nutt.) 



Common in the hilly districts and on the plains of the Sacramento. 

 Surface of achenes and length of beak often exceedingly variable, even 

 in the same head. May. 



3. A. apargioides (Less.) Greene. Low and tufted, the stems 

 erect or ascending from a woody caudex, 7 to 14 in. high; leaves 

 narrow, pinnatifid into slender or remote lobes or sometimes entire; 

 heads 6 or 7 lines high; achenes 1£ to 2 lines long, the beak not 

 longer than the body; pappus dull white. — (Troximon apargioides 

 Less.) 



Sand hills of the San Francisco Peninsula. 



4. A. hirsuta (Hook.) Greene. About 1 ft. high, the herbage 

 short-pubescent; leaves pinnately parted into linear lobes or spatulate 

 and merely toothed; peduncles reddish; flowers bright yellow, fading 

 reddish; achenes 1£ to 2 lines long; pappus commonly dull or yellow- 

 ish white. — (Leontodon hirsutum Hook.) 



Grassy hills about San Francisco Bay. June-Aug. 



5. A. grandiflora (Nutt.) Greene. About 1£ ft. high; herbage 

 hirsutely pubescent or glabrate; leaves spatulate-lanceolate, sinuate- 

 dentate to laciniate, or with salient subfalcate lobes; flowers light 

 yellow; bracts of the involucre lanate or tomentose when young; 

 expanded fruiting head 2 to 2f in. broad; achenes 2£ to 3 lines long, 

 the beak 10 lines. — (Troximon grandiflorum Gray.) 



Plains of the Sacramento Valley. 



Var. intermedium (A. intermedia Greene). Herbage woolly- 

 pubescent when young; leaves pinnately parted, segments narrowly 

 linear, rachis linear and with a linear-lanceolate terminal lobe; 

 achenes sharply carinate-ribbed, 2 to 2 } lines long, the beak 6 to 10 

 lines long; ribs along their sides more or less short-setulose. — Inner 

 Coast Ranges: Mt. Diablo; Vaca Mountains. June. 



6. A. plebeia Greene. Robust, 1£ to 2 ft. high; leaves narrowly 

 oblanceolate, pinnatifid into slender upcurving lobes, the &pex dis- 

 posed to be entire and slenderly acuminate; ligules short, deep yellow, 

 scarcely or not surpassing the bracts of the involucre, which are 

 woolly at base; body of achene 2 to 2£ lines long, the beak 5 or 6 

 lines long; pappus soft and white. 



Western base of the Oakland Hills. 



7. A. retrorsa (Benth.) Greene. Very woolly-pubescent when 



