COMPOSITE FAMILY 257 



2. H. exilis Gray. Annual, erect, 1 or 2 ft. high. Leaves 

 1 to 3 in. long, lanceolate, sparingly toothed, tapering to the 

 petioles. Heads 1 to 2Yz in. across, the bracts hairy on back 

 and edges. Bracts of disk each with an awn longer than the 

 flowers. — Yosemite Valley, Hog Ranch, etc. 



3. H. californicus var. mariposianus Gray. Perennial, 3 to 

 8 ft. high, the stems very smooth. Leaves ovate or lanceolate, 

 entire, 4 to 10 in. long, 3 in. or less wide. Bracts of the 

 involucre linear-lanceolate. Rays, etc., similar to no. 1. — 

 Yosemite Valley, Wawona. 



23. HELIANTHELLA. 



1. H. californica Gray. Root perennial, crowned with tufts 

 of leaves and several slender few-leaved stems each termin- 

 ated by a solitary head (heads rarely 2 or 3). Leaves lanceo- 

 late, entire, tapering to each end, 4 to 10 in. long, Y2. to l l / 2 in. 

 broad, nearly glabrous. Heads about V/2 in. across including 

 the many yellow rays, the disk also yellow; outer bracts leaf- 

 like. Akenes flat, glabrous, the pappus obscure. — Abundant 

 around Wawona and along the foothills. 



24. MADIA. Tarweed. 



Erect herbs with alternate entire leaves and yellow flowers. 

 Involucre angled by the sharply folded bracts, each of which 

 completely enfolds its ray-akene, the tip free. Ray-akenes 

 laterally compressed, with narrow backs, fertile; disk-akenes 

 sterile. 



1. M. yosemitana Parry. Yosemite Madia. A delicate an- 

 nual, 3 to 12 in. high, hairy and glandular. Leaves linear, Y2 

 to 1 in. long. Heads very small, on long peduncles. Rays 5 

 to 10, minute, yellow. Pappus of ray-flowers a minute crown; 

 pappus of disk-flowers of about 5 long bristles. — Common in 

 moist places around Yosemite and Hetch Hetchy valleys, 

 extending to 6500 ft. alt. The type specimens were gathered 

 by Dr. C. C. Parry in June, 1881, "in damp moss at the foot 

 of the Upper Yosemite Fall." 



2. M. bolanderi Gray. Stout, V/ 2 to 4 ft. high, hairy and 

 very glandular. Leaves linear, 5 to 10 in. long, grass-like. 

 Heads large, Y* m - across exclusive of the 12 to 18 yellow rays. 

 Pappus of conspicuous scales (in disk-flowers). — Little Yo- 

 semite Valley and the Mariposa Grove. 



3. M. elegans Don. Common Madia. Plant 6 to 18 in. 

 high, glandular above and white-hairy. Leaves linear, 1 to 4 



