SYNOPSIS OF THE FLORA OF COLORADO. 73 



lanceolate, iucisely toothed; heads pauicnlate ; scales of the exterior in- 

 volucre about 20, linear-lanceolate, hirsute (as well as the peduncles) 

 longer than the interior ; acheiiium oval, hispid-ciliate, 2- toothed at the 

 summit/' Parry, 31. Plains. 



BIDENS FRONDOSA, L. Caiion City, Brandegee. Introduced. 



BIDENS CHRYSANTHEMOIDES, MX. Plains uear Denver, Dr. Smith. 



BIDENS BIPINNATA, L. Ute Pass, Porter. Introduced. 



BIDENS TENUISECTA, Gr., PL FendL, 86. Annual, nearly glabrous ; 

 stein l-2 high, very smooth, terete, branching, ascending ; branches 

 striate-angled, with i-3 heads at the naked summits ; leaves opposite 

 or alternate, bipiiiuately-parted or biternately-divided, segments linear, 

 very entire or 2-3 lobed, a little broader than the rachis ; scales of the 

 hirsute involucre linear; rays 5-8, inconspicuous, scarcely equaling 

 the disk ; achenia attenuate linear, glabrous, somewhat 4-augled, striate, 

 awns 2, short. Huerfano County, Greene. 



XiMENESiA 1 ENCELIOIDES, Cav. Annual, cinereous-pubescent; stems 

 stout, striate, 3-5 G high; branched above; leaves opposite or alternate, 

 ovate, coarsely dentate-serrate, tapering into sj long, winged petiole, 

 tripli-nerved, paler beneath; heads corymbose on long, naked pedun- 

 cles; achenia of the disk slightly villous, surrounded by a broad wing, 

 emarginate at the summit of the deeply 3-toothed, yellow ray. rugose 

 and wingless. Abundant around Caiion City, Brandegee. 



DYSODIA CHRYSA^THEMOIDES, Lag. Plains around Denver and Colo- 

 rado Springs, Porter. 



GAiLLARDiA 2 ARISTATA, Pursh. Perennial, villous-pubesceiit or almost 

 tomentose with jointed hairs; stem simple or branched, l-2 high; leaves 

 alternate, minutely punctate, radical and lower ones lanceolate, tapering 

 into slender petiojes, sinuate-pinnatin'd or coarsely toothed, minutely ser- 

 rate or nearly entire, the uppermost linear or oblong-lanceolate; sessile, 

 usually dilated at the base, and partly clasping; heads large, li'-2J' in 

 diameter including the rays; involucre hirsute; corollas of the disk 

 with short, broadly subulate teeth, of a rich brownish -purple or maroon 

 color: rays 10-18, crowded, elongated cuneiform, deep yellow; chaff of 

 the pappus 0-8, broadly lanceolate; nmbrilhe of the receptacle few, 

 arista* form, slender, distinct, not dilated at the base, 2-3 times the length 

 of the nearly smooth achenia. Hall cfc Harbour. Near Denver, B. 

 H. Smith. Pleasant and Monument Parks, Coulter. Sangrede Cristo 

 Kange, Reflficld. 



GAILLARDIA PINNATTFIDA, Ton-. Ann. S. Y. Lye. 2, p. 214. Peren- 





. Cav. Heads many-flowered^ the rays ligulate, in a single 

 Scales of the involucre somewhat in '2 series, narrow, acute, t'oliaceous, spreading. 

 Receptacle convex: the chaff lanceolate, membranaceoos, embracing the flowers. Tube 

 of the corolla his])i<l. Branches of the style in the disk-flowers appendiculftte. 

 Achenia of the disk Hat (ct)in])ressed laterally.) winded, sonn'what hairy, deeply emar- 

 giiiate at the summit, with 2 setiform awns more or less united with the win;; those 

 of rhe ray mostly dissimilar and wingless. T. .y- (i. /'/. X. Am. 



-GAILLAHDIA, FOII^C. Heads many-floweiv*!, radiate: the ray-tlowers neutral, in a 

 single series, deciduous. Scales of the involucre in about 3 series, vt-ry acute. 

 foliaceoiis, more or less callous and appressed or erect at the base, above spreading or 

 at length rehYxed : the 'xterior largest. Keceptacle convex or hemispherical, limbril- 

 late (the timbrilhe rigid or corneous and elongated,) or in one species nearly naked. 

 Rays cuneiform, palmately 3-cleft or toothed at the summit. Corolla of the disk 

 with a short tube, and an elongated cylindraceous somewhat inflated 5-toothed limb: 

 the teeth usually subulate, and hispid with jointed hairs. Branches of the style ter- 

 minated with a very long and acute filiform hispid appendage. Achenia obpyramidal, 

 iuvolucrate with villous hairs. Pappus of (>-10 membranous 1-neived scales, the 

 nerve*? produced into awns about the length of the corolla. T. ( y- (!. FL X. Am. 



