TroximoiN. composite. 491 



into a somewhat distinct beak. — Probably not sufficiently distinct from the 



foregoing. 



t Uncertain species. 



5. T. taraxacifolium (Nutt.) : somewhat hirsute ; leaves lanceolate or 

 oval-lanceolate, scarcely acute, incisely runcinate-toothed at the base ; scales 

 of the involucre in about 2 series, the inner linear; achenia ' rostrately at- 

 tenuated.' Na(t. in trans. Amer. phil. soc. I. c. 



Plains of the Wahlamet, Oregon.— Remarkable for its broad leaves, which 

 are an inch and a quarter wide, by six inches in length, most pubescent on 

 the midrib. Scape rather short. Pappus very long and coarse, minutely 

 scabrous. Nutlall. 



T. odoratum, Raf., and the other fictitious species of the Flora Ludoviciana, it 

 would be quite useless to attempt to identify. 



194. MACRORHYNCHUS. Less. syn. p. 139 ; Fisch. 8f Meyer, ind. 

 sem. St. Pelersh. 1835. ; DC. prodr. 7. p. 145. 



Macrorhynchium, Reichenb. — Trochoseris, Pmpp. tf" Endl. 

 Head many-flowered. Scales of the campanulate involucre imbricated 

 in few series, lanceolate; the exterior often foliaceous, sometimes calyculate. 

 Receptacle naked. Achenia mostly terete, or slightly obcompressed, linear 

 or fusiform, about 10-ribbed or grooved, the ribs callous, corky, or alate, the 

 apex at length produced into a long and slender or filiform beak. Pappus 

 shorter than the achenium, consisting of copious uniform soft and white capil- 

 lary bristles, minutely scabrous, often caducous. — Annual or perennial 

 acaulescent or subcaulescent (American, chiefly Western,) herbs, with 

 nearly the habit of Troximon. Leaves entire or laciniate-pinnatifid. Scapes 

 simple, with soUtary heads. Flowers yellow. 



§ 1. Perennial : ligules elongated: achenia fusiform, 10-ribbed or lO-nerved, 

 glabrous {the outer series sometimes infertile, ex Nutt.) ; the ribs uniform, 

 not winged or j)roduced. — Stylopappus, Nutt. 



* Scales of the campanulate involucre consimilar, in few series ; the exterior often 

 squarrose-spreading or calyculate. (Stylopappus § Troximeria, Null.) 



1. M. troximoides: glabrous, at least when old, acaulescent; leaves ob- 

 lanceolate, mostly obtuse and entire (rarely with one or two small salient 

 teeth), tapering into slender margined petioles ; scales of the involucre lanceo- 

 late, appressec?, in about 2 somewhat ecjual series, the exterior rather broader, 

 woolly pubescent when young, as well as the summit of the elongated scape ; 

 achenia fasiform-linear. strongly and closely 10-sulcafe, gradually attenuated 

 into a beak which is nearly as long as the deciduous pappus, but shorter than 

 the proper bo:ly of the achenium.— Troximon auraniiacum, Hook.! Ji. Bor.- 

 Am. 1. p. 300, t. 104,- DC. prodr. 7. p. 252. T. pumilum, Nutt.! in 

 trans. Amer. phil. soc. I. c. ? 



Alpine prairies of the Rocky Mountains, Drunimnnd ! On the Wind 

 River Chain at the elevation of "7000 feet and more, Lieut. Fremont! Mount 

 Ranier, Oregon, Mr. Tolinie .'—Scape a span to a foot high. Corolla orange- 



