2/0 COMPOSITE FAMILY 



3. T. grandiflorum Gray. Perennial. Leaves 4 to 9 in. 

 long, narrow and tapering, entire or with narrow acute lobes. 

 Heads yellow-flowered, 1 to \ l / 2 in. high, on stalks 6 to 18 in. 

 high. Akenes narrowed into a thread-like beak three times 

 as long as the body. — Hetch Hetchy, Yosemite, and the lower 

 slopes. 



4. T. retrorsum Gray. Perennial. Leaves 4 to 8 in. long, 

 parted into linear acute lobes which point backward. Heads 

 yellow-flowered, \y 2 to 2 l / 2 in. high, on stalks 6 to 15 in. high. 

 Akenes with broad summit abruptly contracted to a thread- 

 like beak about three times as long as the body. — Common 

 on dry hillsides up to about 9000 ft. alt. 



5. T. heterophyllum Greene. Annual. Leaves 1 to 4 in. 

 long, entire or bluntly lobed. Heads yellow-flowered, ^ m - 

 or less high, on stalks 2 to 12 in. high. Akenes with slender 

 beak nearly twice as long as the body. — In low places around 

 meadows at Wawona, Yosemite Valley, etc. 



Other species of Troximon doubtless occur, but specimens 

 with ripe akenes are needed for their identification and these 

 are not at hand. 



49. CREPIS. Hawksbeard. 

 Annual and perennial herbs. Involucre narrow, the bracts 

 with thickened midribs. Akenes narrowed above, 10 to 30- 

 ribbed; pappus copious, white and soft. 



1. C. acuminata Nutt. Perennial, 1 to 3 ft. high, the 

 sparsely leafy stems bearing a loose panicle of yellow- 

 flowered heads. Lower leaves lanceolate, parted into narrow 

 sharp lobes, narrowed below to a petiole and above to a tail- 

 like tip, the whole leaf 5 to 10 in. long, finely pubescent. 

 Involucre (of 5 to 8 main bracts) bright green and smooth, 

 enclosing 5 to 10 flowers. — Occasional at middle altitudes. 



2. C. intermedia Gray. Very similar but often more ashy- 

 pubescent, the involucres especially being ashy with short 

 hairs. — Of wide distribution but not common. C. occidentalis 

 Nutt., with 8 to 24 bracts and 10 to 30 flowers in a head, is 

 another perennial which may occur. 



3. C. virens L. Smooth Hawksbeard. Annual, 1 to 2 ft. 

 high, the few-leaved stems bearing loose panicles of yellow- 

 flowered heads. Leaves oblanceolate, deeply lobed, the ter- 

 minal lobe broadest, the whole leaf 2 to 6 in. long, green and 

 nearly glabrous. Involucre hairy and glandular, many- 

 flowered. Akenes smooth, 10-nerved. — Introduced weed in 

 Hetch Hetchy Valley. 



