Trodvion. COMPOSIT.E. 437 



flowers. — Xutt. in Fras. Cat. & Gen. ii. 127 ; Benth. & Hook. Gen. ii. .5>^ ; 

 Gray, Proc. Am. Acad. ix. 21,5, Bot. Calif, i. 437, & Proo. Am. Acad. xix. 7l! 

 Troximon & Macrorhynchus (Less.j, DC, Torr. & Gray, Fl. ii. 480. 491. 



§ 1. EuTROXiMOX. Akenes more or less linear, beakless, or tapering gradually 

 into a short and thickish beak, on which the nerves or ribs of the body are pro- 

 longed to the apex : pappus rigidulous : perennial from a strong caudex. 



* Xo beak to the akene, its moderately short contracted summit of the same texture as the bodr 

 and equally 10<ostate: involucral bracts somewhat equal, all tapering to a slender acumination, 

 the outer from an oblong or ovate-lanceolate base, glabrous : corolla yellow : root perennial. 

 T. alpestre, Gray. Dwarf from an elongated rootstock or caudex, glabrous : leaves diverse 

 (2 or 3 inches long), narrowly spatulate or lanceolate and pinnately lobed or incised, or 

 parted into narrow linear divisions: scape 2 or 3 inches high, weak: iuvolacre campanulate, 

 7 or 8 lines high; the bracts in about 2 series: akenes 2^ lines lone;, equalled by the slender 

 uniform pappus-bristles. —Proc. Am. Acad. xix. 70, 71. — On Mount Pad do, Washinyron 

 Terr., .'^nkidorf, 18S0. Summit of Cascade Mountains, Oregon, L. F. Henderson. 

 "T. CUSpidatum, Pcrsh. Glauceseent, tomentuluse when young, a span or two or the 

 scape at length a foot high from a thickened caudex : leai es entire, elongated linear-lanceolate 

 and upwardly linear-attenuate, thickish, often nervose, mostly tomentulose-ciliate (2 to 5 

 lines wide) : involucre about inch high ; its bracts in 2 or 3 series : akenes 3 or 4 lines Ljik' 

 when mature, rather shorter than the unequal rigidulous pappus. — PI, ii. 472 ; Torr. &Grav 

 1. c. ; Gray, Mau. 277, cfe Proc. Am. Acad. ix. 21.5. T. marginatum, Xutt. 1. c. — Prairies of 

 W. Illinois and Wisconsin to Dakota ; first coU. by Xultall and Bradbury. .Stronger pap- 

 pus-bristles gradually and slightly widened toward the base. 



* * Akenes with apex tapering gradually into a rather stout and nerved beak which is shorter 

 than the body. — § Xolhotroxlmon, Gray, Bot. Calif. 1. c, partly. 



. T. barbellulatum, Geeexe in herb. Slemler, not glaucous : leaves linear-lanceolate, 

 laciniate-pinnat fid into a few short and narrow loljes, or some entire : involucre narrow, 

 over half-inch high, rather few-flowered ; its 10 to 12 bracts nearly equal, lanceolate, acumi- 

 nate, glabrous : flowers yellow: akenes with the beak (of fully half the length of the fusi- 

 form body) 3 lines long, about the length of the soft distinctly barbellulate pappus. — Castle 

 Lake, near Mount Sliasta, California, C. H. Dwinelle, from Greene. 

 T. glaucum, Xttt. Usually a foot or two high, rather stout, pale or glaucous, either 

 glabrous or with loose pubescence: leaves linear to lanceolate, from entire to sparingly 

 dentate or sometimes laciniate, 4 to 12 inches long: involucre commonly an inch high and 

 many-flowered; its bracts lanceolate or broader; outer series shorter, often pubescent, or 

 even nllous : akenes ^vith the beak 5 or 6 lines long, longer than the pappus, the copious and 

 rather rigid bristles of which are (as in most species) only denticulate-scabrous. — Xutt. in 

 Fras. Cat. & Gen. ii. 12S : Pursh, 1. c. ; Sims, Bot. Mag. t. 1667 ; Torr. & Gray, 1. c. Mncro- 

 rhyndtus i/laucus, Eaton, Bot. King Exp. 204. — Grassy plains, Saskatchewan and Dakota to 

 Brit. Columbia, and mountains of Utah and Colorado; first coU. hy Xuttall and Bradbury. 



Var. parviflorum. A small and slender form : leaves only 2 to 6 inches long : scape 

 a span to a foot high : head smaller and narrower. — T. parviflorum, Xutt. Trans. Am. PhiL 

 Sue. vii. 434. Mncrorhynchus cynthioides, Hook Lond. Joni. Bot. vi. 2.56 i — Plains of X'e- 

 braska and Wyoming to the mountains of X^eiv Mexico. 



Var. laciniatum, Gkay, Bot. Calif. 1. c. Dwarf (a span or two high), with the 

 small heads of the preceding variety, varying to larger, glabrous or glabrate, when young 

 often cinereous-pubescent throughout : rays sometimes purplish externally or in fading : 

 leaves mostly of lanceolate outline and laeiniate-pinnatifid. — Jlotmtains of Colorado and 

 Xew iJIexico to the higher Sierra Xevada, California. Larger forms pass into the next. 



Var. dasyoephalum, Tokr. & Grat. Commonly robust, with large and broad 

 heads; the involucre inch broad as well as high, and from villous to cinereous-pubescent, 

 sometimes early glabrate : receptacle not rarely bearing a few chaffy bracts among the flow- 

 ers : leaves from elongated-lanceolate to oblong-spatulate (the broadest even inch and a 

 half wide), from entire to laciniate or rarely pinnatifid : scape from a span to 2 feet high. — 

 — Ammog'eton scorzonerfefolium, Sclirad. L:d. Sem. Hort. Goett. 1833; DC. Prodr. vii. 98. 

 Troximon glaucum, Eichards. App. Erankl. Jour. ; Hook. Bot. Mag. 3462. T.pumilum, Xutt. 



