WYETHIA COMPOSITE 341 



HELIANTHELLA 



bearing a single large head or rarely 3 or 4: leaves from oval 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 leas 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 twD 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, H-2 inches long, pappus a cup or 

 crown with very irregular laciniately cut teeth. In damp ground , Blue 

 Mountains of Oregon. 



W. robusta Nutt. 1. c. W. angustifolia of authors as to the Oregon plant. 

 More or less villous hirsute: stems stomtish, 1-3 feet high mostly erect, leafy, 

 bearing 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. Fl. 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 

 Bquamellse. 



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- 

 cre pubescent or slightly hirsute : rays a full inch long: achenes more or less 

 cilia te : pappus a pair of long awns and rather conspicuous aquameltoe. 

 tern Oregon to the Rocky Mountains," 



