Compositaceae 375 
A. Akenes 5-angled, without intermediate ridges or lines; involucre-bracts nearly vein- 
less. ; EUPATORIUM (p. 375) 
AA. Akenes 10-ribbed or -striate; involucre-bracts striate-veined. 
COLEOSANTHUS (p. 375) 
EUPATORIUM BONEH-SET 
Herbs or sometimes shrubby, erect; ours glabrous, 2—6 dm. high. Leaves mostly 
entire; in ours alternate or opposite, entire or wavy or dentate, ovate, short-petioled, 
3-veined near the base. Heads in ours 15—25-flowered, in panicles; involucre cylindric - 
or campanulate; bracts in |—3 or more series; receptacle naked, flat. Corolla purple or 
blue or white. Anthers included. Akenes 5-angled, without intermediate ridges or lines. 
(Honor of Mithridates Eupator, King of Pontius, who first used one of these in medicine.) 
| eo E. occidentale Hook. 
COLEOSANTHUS (Brickellia) THOROWORT 
Herbs or shrubs, mostly glandular or viscid. Leaves alternate or opposite. Heads 
variously arranged; ours 10—50-flowered; involucre campanulate; bracts in more than 
| series, linear to ovate, striate-veined, none herbaceous, the outer the shorter; receptacle 
flat, naked. Corolla slender, white or pinkish; teeth usually glandular outside. Style 
bulbous at base. Akene 10-ribbed or -striate. (Gk. koleos—a sheath, anthos—a flower; 
probably referring to the involucre.) 
A. Heads 10—20-flowered, 6—12 mm. high. 
B. Plant glandular; leaves 10—-25 mm. long; outer involucre-bracts with greenish 
somewhat spreading tps. E. C. microphyllus Kuntze 
BB. Plant not glandular; leaves 5—-15 mm. long; involucre-bracts all without green 
Hosa. C. californicus Kuntze 
AA. Heads 35—50-flowered, 12—18 mm. high. 
C. Leaves ovate. a : 
D. Plant puberulent or almost glabrous, not viscid, 6—9 dm. high; leaves some- 
what deltoid, truncate or cordate at base, mostly acuminate, slender-petioled. E. 
C. grandiflorus Kuntze 
DD. Plant very viscid-pubescent, 2—4 dm. high; leaves ovate, obtuse, acuminate, 
sessile or hardly petioled. U. E. C, greenei Kuntze 
CC. Leaves oblong or elliptical-lanceolate. 
E. Akenes glandular, with a few scattered bristles; outer involucre-bracts oblong- 
lanceolate. E. C. oblongifolius Kuntze 
EE. Akenes not glandular, with a double row of bristles along the longitudinal 
grooves; outer involucre-bracts ovate. E. 
C. linifolius Kuntze 
ASTEREAE. (AsTER TRIBE)—Leaves mostly alternate. Heads radiate or ray- 
less, all alike (except staminate and pistillate on separate plants in Baccharis), receptacle 
naked (ours). Ray-flowers pistillate or rarely neutral. Corolla of disk flowers nearly 
always yellow, regular, tubular, 4_—5-lobed: style-branches flat, appendaged. Avnthers 
not tailed at base. Pappus none or various, in most species of capillary bristles. 
A. Rays none or very inconspicuous. . 
B. Herbs tho sometimes woody at base; hairy or glabrous, not usually sticky; heads 
all alike. ws 
C. Pappus of 2—8 rigid awns; involucre glabrous and shining but very gummy. 
GRINDELIA (p. 377) 
