684 COMPOSITAE 
V. alternifolia, (L.) DC. (Fig. 1, pl. 191.) ActTrnomeErts. (Acti- 
nomeris squarrosa, Nutt.) Stem smooth or somewhat downy, leafy, 4 to 
9 ft. high. Leaves lance-shaped, sharply toothed, alternate, attached to 
stem by a narrowed base, 4 to 12 in. long, Heads numerous, 1 to 2 in. 
broad. Disk round, yellow; rays 2 io 10, yellow. Southern part of our 
area. Aug.-Sept. 
33. COREOPSIS, L 
Herbs, usually with opposite leaves and with large heads on long flower 
stems, bearing both tubular and ray flowers. Involucre hemispherical, the 
bracts in 2 rows, each of about 8 scales, the outer rather leafy. Recep- 
tacle flat or convex with membraneous chaff. Disk flowers fertile; rays 
not fertile, yellow, brown or pink, usually about 8. 
RAyS spine tch ction ic) Wes! ce, vex sotto Uh in st, Se mee atte tere) ere rem OPEC 
Rays yellow. 
Onestortwouteet high) 3.0.6 cs bw) \s, Je) le. fo) me tom uel ohio) ek GR iceman 
Koursto eight feetihigh » « . <<; «2, (6 © ©) (stpeM ECG hMEeIerES 
1. C. rosea, Nutt. (Fig. 2, pl. 191.) Smartt Pink TICKSEED. 
Branching, leafy, smooth, slender, 8 to 24 in. high, Leaves opposite, grass- 
like, without teeth, 1 to 23 in. long. Heads on slender stems; rays rose 
or pink, 3-toothed. Open swamps. July-Aug. 
2. C. lanceolata, L. (Fig. 3, pl. 191.) LANcE-LEAVED TICKSEED. 
Slender, smooth or slightly downy at base, 1 to 2 ft. high. Leaves oppo- 
site, lance-shaped, 2 to 6 in. long, tapering to long leaf-stalks, which partly 
clasp the stem. Heads on elongated stems, showy; rays 6 to 10, yellow, 
- to 7-lobed at end. Dry soil, May-Aug. 
3. C. tripteris, L. (Fig. 4, pl. 191.) Tatt Corropsis. Perennial 
plant, 4 to 8 ft. high. Upper leaves lance-shaped without leaf-stalks, the 
lower on leaf-stalks, compound, of several lance-shaped segments. Smooth 
or rough on the margins. Heads many; rays 6 to 10, yellow. Woods and 
thickets, Penna., and southward. July-Oct. 
34. BIDENS, L. 
Herbs, annual or perennial, with opposite leaves and, mostly, yellow 
rayed flower heads, the rays, however, in some species absent or rudimen- 
tary. Involucre bracts in 2 series, the outer leafy and larger than the 
inner; receptacle fiat, chafly, but the chaff falling with the fruit. Rays, 
when present, not fertile, in our species always yellow; disk flowers: bear- 
ing stamens and pistils producing fruit. Fruit with 2 or more rigid awns 
which are bearded downward. 
Rays developed, mostly conspicuous. 
Leaves simple, lance-shaped. : 
Head with moderately rounded disk and conspicuous rays . B, laevis 
Head with disk almost a pacar aie the 6 to 1o rays not 
very conspicuous . . . : te) et ta el ee 
Leaves compound. 
Heads nearly cylindric, the 4 or 5 rays not conspicuous B. bipinnata 
Heads spreading, the rays very conspicuoous . . . JB. trichosperma 
Rays absent or rudimentary. 
Leaves simple. ‘ i 
Involucre bracts, outer row somewhat exceeding the inner ones 
. B. connata 
Involucre bracts, outer row 3 or 4 times as long as inner . B. comosa 
Leaves compound. we 
Heads’ + im, high or less «ss + sw fas wt ot ee 
Heads 4 in. high or more . . .. .- .- + « . « B. frondosa 
