


Compositaceae 395 
BB. Flowers in dense leafy clusters; involucre-bracts woolly except at tip. 
E. Involucre-bracts yellowish or white; plant loose-woolly. W. E. 
G. palustre Nutt. (Marsh Cudweed) 
EE. Involucre-bracts brownish; plant appressed-woolly. W. E. 
G. uliginosum L. (Wart-wort) 
DIMERESIA 
Annual, low, finely woolly. Leaves opposite; in ours oval to obovate, petioled, 
glabrate and green above. Heads many, all alike; flowers perfect; involucre-bracts 2, 
herbaceous, each almost enclosing a flower. Corolla regular, tubular, 5-toothed, purple 
or flesh-color. Avnthers sagittate but not tailed at base. Akenes clavate-pyriform, glab- 
rous, many-striate. Pappus-bristles stout, plumose, in 1 whorl, united at base, early de- 
ciduous. E., D. howellii Gray 
ADENOCAULON 
Perennial; stem conspicuously glandular above. . Leaves alternate, wide, white- 
woolly beneath, green and glabrous above; petioled, in ours deltoid-ovate with cordate 
base. Heads small, panicled; involucre-bracts few, herbaceous, receptacle nearly flat, 
naked. Corolla tubular, white. Pistillate flowers marginal, fertile. Perfect but sterile 
flower central; anthers slightly sagittate at base; style not 2-lobed. Akenes obovoid 
or clavate, obtuse, faintly veined, glandular above, much exceeding the involucre-bracts. 
(Gk. aden==a gland; kaulos=a stem.) W. C. E. 
A. bicolor Hook. (Silver-green) 
INULA 
Perennial, pubescent (ours). Leaves alternate; in ours denticulate, the basal 1-2 
dm. wide by 2—5 dm. long, the stem-leaves sessile or clasping. Heads large, radiate, all 
alike; flowers many; involucre-bracts imbricate, in several series, the outer often folia- 
ceous; receptacle not chaffy, flat or convex. JRay-flowers pistillate; corolla 3-toothed, 
yellow. Dyisk-flowers perfect; corolla tubular, yellow, 5-toothed. Akene 4—5-ribbed. 
Pappus-bristles capillary, rough. (The Latin name.) W. 
I. helenium L. (Hlecampane) 
HELIANTHEAE (SUNFLOWER TRIBE)—Herbs, annual or perennial. Leaves 
commonly opposite at least below. Heads all alike, or staminate and pistillate flowers 
in separate heads, radiate or rayless; involucre not scarious tho sometimes bur-like or 
prickly; receptacle chaffy. Ray-flowers neutral or pistillate, when pistillate either sterile 
or fertile: corolla ligulate, in ours yellow or white or pinkish. Disk-flowers staminate or 
pistillate or perfect, fertile or sterile: corolla 4—5-lobed, in ours brown or purple or 
white or pink or yellow. Anthers not tailed at base. Style branches of the perfect flowers 
truncate or tipped with a hairy appendage. Pappus none or never of capillary bristles. 
A. Heads radiate, i. e., with some ligulate outer flowers. 
B. Rays yellow. 
C. Disk-flowers dark brown or purple. 
D. Upper leaves mostly not dissected, or when some are dissected the plant 
not glabrous; pappus of 2 to several teeth or awns. 
E. Receptacle in fruit conical to columnar, akenes 4-angled, not winged; 
leaves alternate, entire to pinnatifid. RUDBECKIA (p. 399) 
