U8 



COMPOSITAE. 



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

 often numerous ; Leaves linear to spatulate or oblong, entire, denticulate, or 

 sinuate-pinnatifid, villous-pubescent; ligules short, inconspicuous; involucre 

 campanulatej ltracts 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; fruiting heads about % in. high. — (Troximon heterophyllum Nutt.) 



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

 face 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 yellowish white. — (Troximon humile 

 Gray.) 



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 2% in. broad; 

 achenes 2y 2 to 3 lines long; the beak 10 lines. — (Troximon grandiflorum Gray.) 



Plains of the Sacramento Valley. Var. intermedia Jepson. 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 

 Mts. June. 



6. A. plebeia Greene. Robust, iy± to 2 ft. high; leaves narrowly oblance- 

 olate, pinnatifid into slender upcurving lobes, the apex disposed to be entire 

 and Blenderly acuminate; ligules short, deep yellow, scarcely or not surpassing 

 ilir 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. 



Oakland Hills to Southern California. 



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

 wool more or less deciduous in age; peduncles 3 to 8 in. or even 2 ft. high; 

 Leaves not rarely as long as the peduncles, pinnately parted into narrowly 

 lin.ar or lanceolate retrorse segments, the rachis linear and the lobes more or 

 l.ss remote; outer bracts or involucre broad; inner linear and narrowly acu- 

 minate, as long as the pappus; ligules short; achenes 2% to 3 lines long, 

 passing abruptly into the slender (<) to in lines long) beak. — (Troximon re- 

 t rorsum Gray, I 



Mountain summits from Mendocino Co. southward to Mt. Diablo and South- 

 ern California. May-June. 



15. LACTUCA L. Lettuce. 

 Tall leafy-Stemmed annuals or biennials with panicled heads of yellow 



Bowers. Leaves alternate. Involucre cylindrical or in fruit conical, its bracts 



