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Compositaceae 40] 
KE. Stems |—3 dm. high or long; leaves obtuse, entire. E. 
H. cusickii Gray 
DD. Stems foes m. high, erect; plant pubescent or hirsute; leaves coarsely ser- 
rate or lobed. W.E.  H. tuberosus lb. (Jerusalem Artichoke) 
HELIANTHELLA. 
Perennial; stems simple or nearly so, Leaves opposite or alternate, scattered, entire, 
_ sessile or the lower petioled. Heads radiate, large, yellow, usually solitary, many flow- 
ered; involucre-bracts linear-lanceolate, imbricated in about 2 series, somewhat foliaceous; 
receptacle flat or convex. Ray-flowers neutral, yellow, 2.5—-3 cm. long (ours). Disk- 
flowers perfect, purplish (ours), 5-toothed. Akenes flat, obovate, one or both margins 
slightly winged. Pappus of | awn or chaffy tooth at each margin at the apex, often with 
scales or short bristles like hairs between them... (Diminutive of Helianthus, a related 
genus. ) 
A. Stem stiff-hairy with spreading hairs at least above. E. 
H. dougilasii Torr. 
AA. Stem minutely pubescent or scabrous to glabrous. E. 
H. uniflora T. & G. 
COREOPSIS TICK-SHED 
Biennial (ours), mostly erect, mostly branched above, glabrous thruout (ours). 
Leaves opposite or the upper alternate; in ours the lower 2-pinnately-parted or -divided, 
the upper mostly 3-foliolate. Heads radiate, long peduncled, cymose (ours) ; involucre- 
bracts in 2 series, united at base, outer usually shorter; receptacle flat to concave. Ray- 
flowers neutral, in ours yellow but brown at base. Disk-flowers perfect, fertile, dark pur- 
plish-brown (ours), 5-toothed. Akenes flat, orbicular to oblong, winged (ours). Pap- 
pus in ours of 2 short teeth. (Gk. koris—a bug, opsis—like; referring to the form of the 
akenes.) W. E. C. atkinsoniana Dousgl. 
BIDENS BEGGAR-TICK 
Leaves opposite at least below. Heads radiate or rayless, solitary in panicles, mostly 
rather large; involucre-bracts in 2 series, the outer often foliaceous and much larger; re- 
ceptacle flat or nearly so. Ray-flowers when present neutral, yellow (ours). Disk- 
flowers perfect, yellow, perfect, 5-toothed. Akenes 4-angled to nearly terete, cuneate- 
oblong to linear. Pappus of 2—6 teeth or awns (ours) ; awns retrorsely hispid or barbed. 
(L. bi=2, dens—a tooth; the akenes of some have 2 barbed teeth.) 
A. Leaves usually 5-divided; plant terrestrial; pappus of 2 awns; akene and awns re- 
trorsely barbed to base; annual. E. (Apparently B. frondosa for our region.) 
B. vulgata Gr. (5-leaved Beggar-tick) 
AA. Leaves serrate to laciniate, or submerged and divided into many capillary seg- 
ments; pappus of 3—6 awns. 
B. Annual, terrestrial; stem erect; leaves 7—15 cm. long; rays none or not over 
16 mm. long; akenes not barbed; pappus-awns retrorsely barbed above only. W. E. 
B. vernua L. , (Nodding Beggar-tick) 
BB. Perennial, aquatic; stem slender and not usually erect; leaves 1—5 cm. long; 
rays 20—25 mm. long; akenes retrorsely barbed at margins; pappus awns retrorsely 
batbedttorbases Wo EB. beckit, Torr. (Water Beggar-tick) 
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