| WYETHIA COMPOSIT A 341 
HELIANTHELLA 
bearing a single large head or rarely 3 or 4: leaves from ova! to broadly 
lanceolate, denticulate or entire, mostly narrowed at base to a short margined 
petiole, 4-8 inches long: bracts of the involucre numerous, narrowly lanceo- 
late, hispid-ciliate, usually with more or less colored tips: rays pale yellow 
to white, nearly 2 inches long: achenes 4 lines long, either prismatic-quad - 
rangular or flattish, 12-nerved: pappus shorter than the width of the achene, 
sometimes minute, chaffy-coroniform and cleft into few or several teeth. 
W. amplexicaulis Nutt. 1. c. Glabrous and smooth throughout, balsamic- 
viscid: stems stout, 1-2 feet high, simple: leaves mostly lanceolate-oblong, 
entire or denticulate; radical 7-15 inches long by 3-4 broad, contracted be- 
low to a short winged petiole; upper cauline 2-6 inches long, partly clasping 
' by a rounded or subcordate base: heads solitary or several, short-peduncled: 
involucre campanulate, about an inch high: its bracts broadly lanceolate, 
acute or obtuse often some of the.outer ones larger and foliaceous: rays 5-20, 
1-2 inches long, dark yellow; achenes 3-5 lines long: pappus unequally 3-8- 
toothed, one or two of the teeth often prolonged into awns, Common in wet 
places, British Columbia to Nevada and the Rocky Mountains. 
~W. lanceolata. Smooth and glabrous throughout: stems assurgent, 6-12 
inches long, bearing a single large head: leaves lanceolate, 2-6 inches long, 
entire or obscurely dentate, all on short petioles or the uppermost barely 
sessile: bracts of the involucre lanceolate, 10-12 lines long, acute, or the in- 
nermost acuminate; rays bright yellow, 14-2 inches long, pappus a cup or 
crown with very irregular laciniately cut teeth, In damp ground , Blue 
Mountains of Oregon. 
W. robusta Natt.1.c. W. angustifolia of authors as to the Oregon plant. 
More or less villous hirsute: stems stoutish, 1-3 feet high mostly erect, leafy, 
hearing a single large head: radical leaves narrow-lanceolate, 6-20 inches long, 
petioled, often ‘sparingly sinuate-toothed; cauline lanceolate, acute, entire. 
tapering to the base, the lowest petioled: bracts of the involucre lanceolate, 
very hirsute, especially on the margins: pappus of 5-10 irregular stout teeth 
and mostly 1-4 stout awns. Common in damp soil, western Oregon and 
Washington. 
42 HELIANTHELLA T. &G. FI. ii, 333. 
- Perennial herbs with mostly simple stems, entire scattered 
and sessile leaves and solitary heads with yellow ray and yellow 
or purplish-brown disk-flowers. Heads many-flowered, the ray- 
flowers neutral : those of the disk perfect.. Bracts of the involucre 
in about two series, loose, somewhat foliaceous. Chaff of the re- 
ceptacle persistent, embracing the achenes. Corolla of the disk 
cylindrical, elongated, 5-toothed, with a very short proper tube. 
Branches of the style very hispid, more or less obtuse. Ovaries 
compressed, with one or both margins slightly winged and pro- 
duced at the summit into a short auriculate and lacerate per- 
sistent appendages or into an awn, sometimes with intermediate 
— squamellee. 
- H. uniflora T. & G. 1. c. “Minutely pubescent or somewhat scabrous or 
glabrate, 1-2 feet high: leaves more commmonly opposite, sometimes all at- 
ternate, oblong-oblanceolate, 2-6 inches long; lower short-petioled: involu- 
vre pubescent or slightly hirsute: rays a full inch long: achenes more or less 
ciliate: pappus a pair of long awns and rather conspicuous squamelle, Has- 
tern Oregon to the Rocky Mountains,” 
