162 
COMPOSITAE 
low, in showy heads on long naked peduncles. Involucre double; bracts 
of the inner series erect, membranous, of the outer series loose and 
foliaceous. Achenes flattened, more or less wing-margined. (Greek, an 
ornament.) 
1. C. calliopsidea (DC.) Gray. Leafy, 2.8 to 5.7 dm. high; bracts of 
outer series broadly ovate, those of the inner narrowly ovate; pappus 
paleae 2, linear.—Moist hillsides: South Coast Ranges; S. Cal. 
13. MADIA Mol. Tarweed 
Glandular-viscid erect herbs. Leaves alternate. Heads axillary and 
terminal. Flowers yellow, opening in the evening. Involucre angled, the 
bracts in one series. Receptacle with a single row of chaffy bracts. Rays 
few to many. (Madi, the Chilian name.) 
Receptacle glabrous; rays inconspicuous; achenes of the ray curved...1. M. satitra. 
Receptacle fimbrillate-hirsute; rays showy; achenes of the ray not incurved. 
2. M. elegans. 
1. M. sativa Mol. Chile Tarweed. Robust, 2.8 to 11.5 dm. high, 
pubescent, glandular, ill-scented; leaves broadly lanceolate to linear; rays 
5 to 12, with pale yellow ligules; cup of receptacle enclosing many disk - 
achenes.—Old fields, vacant lots and waysides; nat. from Chile. 
2. M. elegans Don. Common Madia. Stem 2.8 to 8.6 dm. high; 
leaves linear to linear-lanceolate, short-hirsute; herbage viscid; heads 
in a corymbose panicle; rays yellow or with a red spot at base.—Dry 
hillsides and valley fields. 
14. HEMIZONIA DC. Tarweed 
Viscid-glandular and ill-scented annuals with alternate or sometimes 
opposite narrow leaves. Flowers yellow or white. Disk with a circle of 
bracts or chaffy throughout. Ray-achenes short, thick, half enclosed by 
the lower part of the involucral bract. (Greek hemi, half, and zonia, 
zone, the bracts but half enclosing the achenes.) 
Ray-achenes not beaked; flowers white.1. H. luzulaefolia. 
Ray-achenes beaked ; flowers yellow. 
Receptacle with a circle of bracts surrounding disk-flowers. 
Rays 12 to 25 ; heads hemispherical.2. H. corymbosa. 
Rays 5 ; heads very narrow in small clusters.3. H. fasciculata. 
Receptacle with chaffy bracts throughout. 
Rays 4 or 5 ; leaves ending in a truncate gland.4. H. virgata. 
Rays 25 to 40 ; leaves spinose.5. H. pungens. 
1. H. luzulaefolia DC. Hay-field Tarweed. Stem freely branch¬ 
ing, diffuse or erect, 2.8 to 5.7 dm. high; lower leaves crowded, more or 
less tufted, narrowly linear, canescent; heads numerous; outer bracts of 
receptacle united into a cup.—Mowed hay fields and pasture lands. 
2. H. corymbosa (DC.) T. & G. Coast Tarweed. Corymbosely and 
widely branching, 3 to 4 dm. high; basal leaves pinnately divided, the 
upper linear; pappus minute or none.—Valley fields and hillsides, Berkeley 
to Monterey Co. 
3. H. fasciculata (DC.) T. & G. Paniculately branched, 2.2 to 5.7 
dm. high; basal leaves pinnately parted, the stem leaves linear; heads 
fascicled in rather dense small clusters; pappus of linear paleae.—Mt. 
Diablo to S. Cal. 
