400 Compositaceac 
E. Leaves deltoid in outline, entire to laciniate, not stiff-hairy; involucre more or 
less woolly, not stiff-hairy. E. B. terebinthacea Nutt. 
EE. Leaves lanceolate in outline, pinnately-parted or -divided, stiff-hairy; involucre 
rarely woolly, stiff-hairy. E. B. hirsuta Nutt. 
DD. Plant canescent or white-tomentose. 
F. Plant canescent, with appressed or spreading hairs; leaf-divisions linear. W. 
| ime WE balsamorhiza. ) B. hookeri Nutt. 
FF. Plant densely white-tomentose with often floccose hairs; leaf-division oval- or 
oblong. E. B. incana Nutt. - 
WYETHIA 
Perennial; stems usually simple, from stout root or rhizome. Leaves alternate, most- 
ly basal, mostly entire and large. Heads radiate, large, | to few on a stem, many-flow- 
ered, all alike; involucre-bracts loosely imbricated in. 1——3 series, the outer large and 
often foliaceous; receptacle slightly convex.. Ray-flowers pistillate, fertile, yellow, 2-10: 
em. long (ours). Disk-flowers yellow, 5-toothed. Akenes 4—5-angled. Pappus crown- 
fike, laciniate or 3—10-toothed, 0-4 of the teeth prolonged into an awn. (Honor of 
N. J. Wyeth, an American botanist. ) 
A. Ray-corollas white to pale-yellow; leaves oval to broadly-lanceolate; stem stiff- 
hairy. E, W. helianthoides Nutt. 
AA. Ray-corollas bright-yellow; leaves oblong-lanceclate to narrowly lanceolate. 
B. Plant sparsely stiff-hairy; involucre very stiff-hairy. W. E. _(W. robusta.) 
W. angustifolia, Nutt. 
BB. Plant smooth and glabrous thruout: involucre glabrous. 
C. Basal leaves oblong-lanceolate, 17—-38 cm. long, 7—10 cm. wide; upper 
stem-leaves partly clasping. E. W. amplexicaulis Nutt. (Pe-ik) 
CC. Basal leaves lanceolate, 5-15 cm. long, 2—10 cm. wide; upper stem- 
leaves barely sessile and not clasping. E. 
W. lanceolata How. 
HELIANTHUS SUNFLOWER 
Leaves opposite or alternate, simple. Heads radiate, large; solitary or in corymbs; 
involucre-bracts imbricated in several series; receptacle flat to conic. Ray-flowers yel- 
low, neutral, usually entire. Disk-flowers yellow or brown or purple, perfect, fertile, 
5-lobed. Akene oblong or obovate, flattish to 4-angled. Pappus of 2 scales or awns, 
or sometimes with 2—4 additional shorter ones, deciduous. (Gk. helios—the sun, an- 
thos=a flower; said to refer to the resemblance. ) 
A. Annual; disk-flowers brownish or dark purple. 
B. Leaves ovate-lanceolate or wider; rays more than 8; chaff of the receptacle 
3-toothed or -cleft, not awn-like at tip; disk often over 12 mm. wide. 
C. Disk about 1.5 cm. wide; leaves oblong to ovate-lanceolate, 2.58 cm. long. 
, H. petiolarig Nutt. (Prairie Sunflower) | 
CC. Disk 2.5 cm. or more wide; at least the lower leaves ovate or cordate, 517 
cm. long. E. H. annuus L. (Common Sunflower ) 
BB. Leaves lanceolate to linear-lanceolate; rays 5-8; chaff of the receptacle not 
3-toothed, narrowed into an awn-like tooth; disk 12 mm.-or less wide. U. 
AA. Perennial; disk-flowers yellow. 
D. Stems 1.2 m. or less high or long, often not erect; plant scabrous, without hairs; 
leaves entire or serrulate. 
E...- Stems 3—12 dm. high or long; leaves acute or acuminate, entire or serrulate. 
: H. nuttallii T. & G. 
pa 
=— 
a 

