SUNFLOWER FAMILY. 499 



13. CREPIS L. 



Annuals, biennials, or perennials, similar to Hieracium, but tomen- 

 tukius or glabrous, not pilose. Involucre of a single row of equal 

 scales, or often with smaller ones at base. Flowers yellow. Aohenes 

 columnar or fusiform, 10 to 20-ribbed. Pappus copious, white and 

 soft. (Greek krepis, a sandal, the ancient name of some plant.) 



Plants glabrous; heads Ji in. high . . . .I.C.mrens. 



Plants tomentose ; heads J^ in. high. . . .2. C. occidentalis. 



1. C. virens L. Smooth Hawksbeakd. Annual or biennial; 

 stem one, slender, simple below, paniculate above, 1 to 2J ft. high; 

 herbage green and glabrous; leaves thinnish, mostly radical, broadly 

 oblanceolate, toothed (the teeth inclined to be salient) or shallowly 

 pinnatifid, narrowed at base into a petiole; upper eauline lanceolate, 

 with sessile subsagittate base; heads many, small (J in. highi; involu- 

 cre somewhat oalyculate, its bracts linear, acuminate; achenes linear- 

 oblong, narrowed equally to each end, 10-costate, 1 line long. 



Introduced weed: spontaneous at Berkeley. 



2. C. occidentalis Nutt. Gkat Hawksbeard. Perennial; 

 stems stout, one or several, branching above, 4 to 10 in. high; 

 herbage thinly tomentose and often glandulai'-hirsute above, especially 

 on the peduncles; leaves thickish, runcinately toothed, or deeply pin- 

 natifid into linear or lanceolate lobes, the uppermost portion entire, 

 acuminate; involucre 6 to 8 lines high, calyculute, its bracts oblong- 

 lanoeolate; achenes brown, oblong, 10 to 18-eostate, 3 lines long. 



Mt. Hamilton, Brewer, no. 1304; seldom collected in California. 



14. AGOSERIS Raf. 

 Perennial herbs with strong and often deep taproots, or annuals. 

 Stems naked and scape-like, bearing single large heads. Leaves in a 

 radical tuft, elongated. Flowers yellow. Bracts of the campanulate 

 involucre imbricated, the outer ovate, passing into the Imear or lan- 

 ceolate inner ones. Achenes terete, oblong or fusiform, 10-ribbed, pro- 

 longed into a slender or filiform beak. Pappus-bristles fine, copious, 

 white or nearly white, inserted on the dilated apex of the beak. 

 Achenes in fruit expanding and forming a globose head, the bracts of 

 the involucre reflexed. (Greek agos, chief, and Seris, Lettuce.) 



Annuals. 

 Ligules conspicuous .... .1. A. major. 



Ligules inconspicuous . .2. A. heterophylla. 



Perennials. 

 Achenes tapering into the heak. 

 Ligules elongated, much surpassing the involucre. 

 Coast species. 



Beak not longer than body of achene 3. A. apargioides. 



Beak about twice as long as body of achene i. A. hirsuta. 



Interior species ; beak about 3 times as long as body of achene. . . . 



5. A. grandiflora. 

 Ligules very short, scarcely surpassing the involucre; bases of the Bay 



hills .... . .%. A. pltbeia. 



Achenes abruptly beaked; montane. . .7. A. rttrorsa. 



1. A. major Jepson. Six to 18 in. high; leaves frequently pinnat- 



