CICHORIACEJE. 225 



11. HIERACIUM, Diosc. Perennial, often rough-hairy herbs. 

 Involucre subcylindric, of uniserial linear braota. Beoeptacle naked. 

 Flowers mostly yellow (in ours white). Achenes linear, 10-ribbed or 

 -striate. Pappus of rigid fragile dull-white or brownish bristles. 



1. H. albiflornm, Hook. Leaves mostly radical, oblong-spatulate, 

 entire or denticulate, 2 — 5 in. long, thickly beset with long bristly hairs: 

 stem nearly naked above, ending in a more or' less ample panicle of 

 white-flowered heads: involucre 3 — 5 lines long, achenes 1% hues long, 

 not tapering, evenly striate-ribbed. — Woods of the Coast Range. 



12. CREPIS, Dalechamps. Perennial, tomentulose or glabrous herbs. 

 Involucre of linear equal bracts, usually with calyculate short ones at 

 base. Flowers yellow. Achenes columnar to fusiform, 10 — 20-costate. 

 Pappus of copious soft white bristles. 



1. C. acuminata, Nutt. Hoary-tomentulose, slender, 1 — 2 ft. high, 

 with open cyme of many slender peduncled narrow heads : leaves radical, 

 runcinately pinnatifld into lanceolate or linear lobes below the middle, 

 the apex prolonged into a narrow entire acumination : involucre 5 — 7 

 lines high, narrow-cylindric: achenes 10-striate, tapering at summit. — 

 Mt. Hamilton; thence southward and eastward. 



2. O. virens, L. Green and glabrous, slender, 1 — 2 ft. high: leaves 

 mostly radical, lanceolate or broader, toothed or pinnatifld; cauline 

 sessile, with subsagittate base: heads very small; fl. yellow: achenes 

 oblong, 10-striate, smooth, narrowed slightly but about equally at both 

 ends. — In shady grassy places about Berkeley; naturalized from Europe. 



13. AGrOSERIS, Raf. Herbs usually quite acaulescent, with tufted 

 radical leaves lanceolate, pinnately toothed or cleft, and simple scapes 

 bearing solitary large heads of yellow or orange-colored flowers. Invo- 

 lucre at first subcylindric, later approaching the conic: bracts imbricated 

 in 2 series, the outer often short, more foliaceous and spreading. Achenes 

 oblong or linear, or slender-fusiform, terete, 10-ribbed; the apex pro- 

 duced in ours into a very slender beak with a dilated terminal areola on 

 which are inserted the copious fine white pappus-bristles. 



* Perennials; achenes tapering into the beak. 



-i— Heads very large, but ligules very short. 



1. A. plebeia, Greene. Sparsely lanate-hirsute on the leaves beneath, 

 the involucres woolly at base, otherwise glabrous: scapes often 2 ft. 

 high: leaves not rarely 1 ft. long, narrowly oblanceolate, usually slenderly 

 acuminate, the sides with several pairs of abrupt triangular teeth or 

 subfalcate lobes: ligules short, suberecl, deep yellow: achenes slender-- 

 fusiform, 2—2*^ lines long; beak 5 or 6 lines; pappus very soft and 

 white.— Western side of the Coast Range, and about the Bay; the most 

 rank and the least showy species. May, June. 



