72 SYNOPSIS OF THE FLORA OF COLORADO. 



length; involucre 6" long; disk 6" broad; ligules 7"-9" long. Caiiby. 

 Ute Pass, Porter. South Park, Coulter. Central City, Greene. 



HELIOMERIS l MULTIFLORA, Nutt. Jour. Acad. Phil., (N. &,) 1, p. 171- 

 Steins few from a woody root, i-2 liigh, simple or corymbosely branched 

 above; leaves narrowly lanceolate, l'-2J' long, 3"-6" broad, more or less 

 scabrous pubescent, entire or obscurely serrate; heads 6"-8" broad, 

 excluding the rays, mostly terminal on long branches; chaff of the re- 

 ceptacle rather rigid, pungently acute, villose; rays 10-12, oblong-oval, 

 entire or slightly emarginate; achenia compressed-pyriform, scarcely 

 angled, black and somewhat shining. Hall t& Harbour, 211. Near Den- 

 ver, Dr. Smith. Among the mountains, Canby. Canon City, Brandegee. 

 Mount of the Holy Cross and Sierra Madre Range, Coulter. 



Yar. LATIFOLI A, Porter. Taller, 3 high; leaves larger, 3'-4' long, 

 I'-IJ broad, usually serrulate with scattered teeth. Foot- hills near Col- 

 or ad"o Springs, Porter. 



THELESPERMA 2 FILIFOLIUM, Gr. Annual, glabrous, l-2 high, much 

 branched, branches slender ; leaves opposite, 1-2 pinnately parted or 

 divided, the upper 3-5 divided or simple, nearly sessile, divisions atten- 

 uate-filiform, scales of the interior involucre with broad scarious margins 

 united nearly to the middle, longer than the linear-subulate, exterior 

 scales; rays obovate, 3-toothed; acheuia 3" long, crowned with two 

 triangular- subulate, concave, at length divaricate short awns or teeth 

 which are fringed with yellow, retiexed, bristly hairs; heads numerous, 

 small, G" broad without the rays. Hall & Harbotir, 280. Canon City, 

 Brandegee. Near Denver, Dr. Smith. Plains around Colorado Springs, 

 Porter. Monument Park, Coulter ; Redfield. 



THELESPERMA GRACILE, Gr. Erect, 2-3 high, branched above 5 

 branches strict, elongated, corymbose ; leaves pinnately or pedately about 

 5-parted, with narrowly-linear, rigid lobes, the uppermost nearly simple ; 

 heads few-many, on long peduncles; involucre campanulate, inner 

 scales united above the middle, obtuse or acutish, often with narrow, 

 scarious margins, exterior ovate, very short, obtuse ; rays none ; achenia 

 oblong-linear, crowned with 2 stout subulate, persistent, spreading,, re- 

 trorsely pectinate-hispid awns. Hall & Harbour, 279. Plains around 

 Denver and Colorado Springs, Porter. 



COREPOSIS TINCTORIA, Nutt. On the plains. Hall. 



COREPOSIS INVOLUCRATA, ^utt. u Minutely pubescent, stem quad- 

 rangular below ; leaves 1-2 piunately 3-7 parted, the divisions linear - 



1 HELIOMERIS, Nutt. 



, Nutt. Heads many-flowered, radiate; rays neutral; disk-flowers 

 numerous, perfect, the corolla with a very short pubescent proper tube, (i. e. ampli- 

 ated very near the base,) 5-toothed. Involucre spreading; oblong-linear scales in about 

 2 rows. Receptacle oblong-conical, covered with persistent lanceolate, concave-cari- 

 nate chaff, partly embracing the disk-flowers and nearly their length. Stamens with 

 broad ovate appendages and blackish anthers. Branches of the style obloiig-clavatc, 

 slightly hispid. Achenia cuneate-oblong, compressed-quadrangular, entirely destitute' 

 of pappus. Perennial Western North American herbs or sunrutescent plants, with 

 nearly entire, mostly opposite leaves and yellow flowers, smaller than those of most 

 ffcUanthi. 



- THELKSPERMA, Gray. ( Covmidhim, T. & G., FL X. Am.) Heads many-flowered ; the 

 ray-flowers about 8, neutral,, or sometimes wanting; those of the disk tubular, perfect. 

 Involucre double, each, of 8 scales; the interior oblong-ovate, somewhat niembrana- 

 ceous, united to the middle, much larger than the exterior. Receptacle flat ; the chaff 

 scarious, oblong, obtuse, with *2 approximate colored nerves, shorter than the flowers, 

 partly investing the achenia, and deciduous with them. Corolla of the disk with a 

 very slender tube and a deeply 5-cleft limb ; the segments long and linear, recurved, 

 Achenia linear-oblong (obscurely-angled when young,) terete or slightly Decompressed, 

 a little incurved and tubercnlate on the back when mature, not rostrate, the abrupt 

 summit crowned with 2 dentiform retrosely pectiiiate-ciliate (persistent '?) awns. 



