258 COMPOSITE FAMILY 



in. long. Heads scattered, on distinct peduncles. Rays 12 to 

 15, about y 2 in. long, yellow, or with a red spot at base. 

 Pappus none. — Abundant at moderate altitudes. The yellow 

 heads with a central dark eye are very ornamental. 



4. M. glomerata Hook. Erect, usually simple, 4 to 18 in. 

 high, soft-hairy. Leaves linear, erect. Heads clustered, on 

 very short peduncles, yellowish green and glandular. Rays 

 greenish, few or entirely wanting. Pappus none. — Found near 

 Snow Creek at 6600 ft. alt. 



5. M. exigua Greene. Slender, 4 to 8 in. high, glandular 

 and sweet-scented. Leaves linear, 1 in. or less long. Heads 

 scattered, on naked peduncles, small. Rays minute, yellow; 

 disk-flower solitary, without pappus. — Plentiful throughout 

 the Sierra Nevada. 



M. dissitiflora T. & G., is a foothill weed with scattered 

 heads on short peduncles, small yellowish rays, 5 to 20 disk- 

 flowers, and no pappus. 



25. HEMIZONELLA. 

 1. H. minima Gray. Only 2 or 3 in. high, branched, stiff- 

 hairy. Leaves linear, entire, not ^2 in. long. Heads nearly 

 sessile, in small dense clusters, scarcely l /& in. high; bracts 

 folded for their whole length. Rays minute, yellow. Pappus 

 none. In var. parvula Hall, the earliest heads are slender- 

 peduncled, the stems sometimes 6 in. high, and the ray-akenes 

 tipped with a short incurved beak. — Both forms occur with us. 



26. HEMIZONIA. Tarweed. 



Differs from Madia in the obcompressed ray-akenes, which 

 are therefore thick and with broad backs and are not com- 

 pletely enclosed in their bracts, the upper portion of which 

 is flat. 



1. H. wrightii Gray. Commonly 1 ft. high, widely 

 branched above, glandular and sweet-scented. Lower leaves 

 toothed. Heads numerous, on bracted peduncles. Rays 

 mostly 5, yellow, showy. Ray-akenes rough, beaked; disk- 

 akenes with pappus of torn scales. — Plains and foothills, 

 reaching the lower end of Yosemite Valley. 



2. H. douglasii Gray. Stems 1 or 2 ft. high, rarely 

 branched, soft-pubescent. Leaves narrowly linear, entire. 

 Heads sessile, clustered in all the upper leaf-axils, the bracts 

 marked with peculiar tack-shaped glands. Rays few, white 

 purplish or yellow, deeply 3-lobed. Pappus of disk-flowers of 

 10 or 12 linear-lanceolate scales as long as corolla.— A foot- 



