842) CCMPOSIT 2 HELIANTHUS 
H. Douglasii T. & G: 1. ¢. Stenis hirsute with spreading hairs, at least: 
above, 1-4 feet high, striate-angled, leafy: leaves oblong-lanceolate, acutish, 
nearly sessile, triple-nerved, rough-pubescent, 2-4 inches long: bracts of 
the involucre linear-lanceolate to subulate, 6-9 lines long: rays an inch long: 
disk nearly an inch broad: achenes obovate, more or less ciliate,fringed: pap- 
pus a pair of elongated awns with more or less chaffy dilated base, or some- 
times reduced to this base, and with mostly conspicuous squamelle. Dry 
grounds eastern Oregon to British Columbia. 
438 HELIANTHUS L. Gen. n. 979. (SUNFLOWER.) 
Erect annual or perennial herbs with simple leaves and large 
heads of yellow flowers, or those of the disk sometimes brown . 
or purple. Involucre hemispherical or depressed; its bracts 
imbricated in several series. Receptacle flat to conic, chaffy: 
the chaff subtending and more or less embracing the achenes. 
Ray-flowers neutral: those of the disk perfect and fertile, with 
short proper tube and 5-toothed limb. Anthers entire or min- 
utely 2-toothed at the base. Style-branches tipped with hir- 
sute appendages. Achenes thick, oblong or obovate, compress- 
or somewhat 4-angled. Pappus of 2 scales or awns, or some- 
times with 2-4 additional ones, deciduous. 
§ 1 Annuals. Involucre spreading, its bracts attenuate to 
a point. Disk-flowers brownish or ane poe Receptacle 
flat or nearly so. Leaves petioled, 3-ribbed from or near the 
base, all but the lower usually alternate. | 
H. annuus L: Sp. ii, 904. Stems hispid or scabrous, stout, branched 
above, 2-6 feet high, or in cultivated forms sometimes 15 feet high: leaves 
all but the lowest alternate, broadly ovate, petioled, 3-nerved, dentate or den- 
ticulate, acute at the apex, rough on both sides, sometimes pubescent beneath 
cordate at base, 2-12 inches long: bracts of the involucre hispid and hispid- 
ciliate, the outer ovate and abruptly attenuate to a stout bristle; the inner 
lanceolate and attenuate : rays lanceolate, 1-2 inches long: disk an inch or 
more or in cultivated plants 4-10 inches in diameter: chaff of the receptacle 
3-cleft: achenes obovate-oblong, appressed-pubescent to nearly glabrous, On 
sandy banks and plains, Brit. Columbia to California and Minnesota. 
H. petiolaris Nutt. Journ. Acad. Philad. ii, 115. Stem strigose-hispid or 
hirsute. 1-3 feet high, simple or branched: leaves all but the lowest alternate, 
petioled, oblong or ovate to lanceolate, rough on both sides, usually paler 
beneath, 1-3 inches Jong, entire or denticulate, mostly narrowed at the base 
toa long and slender petiole: bracts of the involucre lanceolate or oblong-lan- 
ceolate, with acute and mucronate or sometimes more attenuate tips, seldom 
at all ciliate; rays oblong, 12-18 lines long: disk 6-10 lines in diameter: chatf 
of the receptacle 3-toothed, not longer than the corollas: achenes villous-pu- 
bescent, On dry prairies, Washington to Arizona Minnesota and the North- 
west Territory. 
H. exilis Gray Proc. Am. Acad. vi, 545, More or less hirsute: stems 
slender, 1-2 feet high, branching: leaves linear-oblong or lahceolate, nearl 
entire, obscurely 3-nerved at base, tapering into a short petiole: heads smail, 
on slender sometimes leafy-bracted peduncles: involucre loosely hirsute, its 
bracts linear-lanceolate, attenvate-acuminate: rays 5-8: chaff of the receptacle 
produced: into an awn-like cusp which equals or surpasses the dark-purple 
corollas: aclienes nearly glabrous: pappus of 2 ovate-lanceolate chaffy scales. 
