180 COMPOSITE. 



leaves lanceolate, acute, entire, 2—5 in. long, entire, or obscurely serrate, 

 the whole margin scabrous: heads J£ in. high, in a more or less ample 

 panicle of short loose leafy racemes; bracts of campanulate or broadly 

 obconic involucre much imbricated, linear or linear-spatulate, with short 

 and rounded green tips: rays 25 — 30, purple or violet, % i n - long. — 

 Common and variable; some forms very showy. Aug. — Oct. 



5. A. Sonomensis. Slender, decumbent at base, 1 — 1% ft. high, 

 glabrous and glaucescenl, only the leaf-margins scabrous-ciliolate: leaves 

 mainly radical, narrowly lanceolate, tapering to a long petiole, this with 

 a dilated and strongly ciliate basal part: heads rather few in a terminal 

 corymbose panicle: involucres % in. high, broad-campanulate to broad- 

 obconic, the well imbricated bracts narrowly oblanceolate, acute; rays 

 purplish, rather narrow, % in. long. — In open plains of the Sonoma 

 Valley, in low subsaline ground. Sept., Oct. 



6. A. lentils. Erect, slender, 4 — 6 ft. high, slightly succulent, glabrous 

 except a slight pubescence under the heads, and a delicately serrulate- 

 scabrous margin to the leaves: lowest leaves 3 — 5 in. long, lanceolate- 

 linear, slightly falcate, those of the flowering branches straight and 

 half -clasping at the sessile base: panicle loose and ample, often a yard 

 long, the branches loosely racemose: heads 4 — 5 lines high; involucres 

 oblong; brads linear, acute, appressed, green-herbaceous and somewhat 

 succulent almost throughout: rays many, % in. long, light purple. — 

 Plentiful along tidal streams in western part of the Suisun marsh; the 

 largest and most beautiful'of Oalifornian species. Oct., Nov. 



* * * Biennial or annual, paniculate; heads small. 



7. A. exilis, Ell. Glabrous, slender, 2—6 ft. high, with narrow 

 lanceolate or linear entire leaves, and a diffuse panicle of very small 

 heads: bracts of narrow involucre lanceolate-subulate, mainly green - 

 herbaceous, the margins scarious: rays white, short and inconspicuous: 

 pappus fine and soft: achenes little compressed. — Borders of Suisun 

 marshes, and elsewhere in low subsaline land. Aug. — Dec. 



18. EEIGEROJf, Linn. Involucre of narrow, usually almost equal 

 bracts which are never coriaceous or distinctly herbaceous-tipped. Bays 

 very narrow, commonly extremely numerous and in several series, but 

 in several of our species wanting. Style branches with short roundish 

 appendages. Achenes compressed, 2-nerved. Pappus of scanty fragile 

 bristles, a short outer series sometimes manifest. 



* Perennials; stems leafy at base; cauline leaves reduced. 



1. E. glancus, Ker. Monocephalous branches several from a sloutish 

 leafy caudex, the whole plant more or less villous or hirsute, especially 

 above; leaves obovate or spatulate-oblong, 2—4 in. long, entire or with 



