SYNOPSIS OF THE FLORA OF COLORADO. 75 



acheuium." We have adopted for this variable species the excellent 

 emended description of Prof. Eaton in King's Report, vol. 5, p. 172. 

 Hall & Harbour, 283; Parry; Canty. Upper Arkansas, Porter. 

 Saugre de Cristo Pass and Sierra Mojado, Brandegce. Twin Lakes, 

 Mount La Plata, and Sierra Madre Bange, Coulter. 



HYMEXOPAPPUS TENUIFOLIUS, Pursh. Whitened-tomentose, often 

 becoming smoothish ; stems 8'-15' high, leafy at base, sparingly 

 corymbose toward the summit, sometimes several from a rather stout, 

 simple or branched, perennial caudex; radical leaves petioled, 2 / -4 / 

 long, 2-3 pinna tely divided, divisions very narrowly linear, caiiline ones 

 sessile, similar but smaller or reduced above the linear bracts ; heads 

 pedunculate, 4"-6" wide, hemispherieal-campanulate ; scales of the in- 

 volucre 6-8, oval, appressed, with broad, obscurely-denticulated, scarious 

 margins ; corolla-tube very short, throat abruptly inflated ; pappus of 

 spatulate-oblong, obtuse, slightly-erose scales, nerved to the middle, 

 mostly as long as the tube of the corolla. Hall& Harbour, 282. Upper 

 Arkansas, Porter. Canon City, Brandegee. Plains of the Platte, Coulter. 

 Wet Mountain Valley, Redfield. 



BAHIA 1 OPPOSITIFOLIA, T. & G. Perennial, canescently pubescent, 

 very much branched from the base upward, 4'-S' high ; branches op- 

 posite, more or less spreading or decumbent; leaves opposite, petio- 

 late, 1-2 palmately divided, segments linear or lance-linear, about V 

 long; peduncles slender; involucre campanulate; scales 5-8, oblong- 

 ovate; rays about the same number, very short; pappus minute, scales 

 5-8, partly obtuse, somewhat lacerate ; achenium fusiform, tapering to 

 the base, sparingly scabrous. Hall ci* Harbour, 278. Around Denver, 

 Dr. Sitilth. Colorado Springs, Porter. Canon City, Brandegee; Cahby. 



ViLLANOVA 2 CHRYSANTHEMOIDES, Gr. PL Wright., 2, p. 96. Puber- 

 ulent ; stems erect, l-4 high, coryinbosely-panieulate above; flowering 

 branches and peduncles viscous-glandular; leaves alternate, 1-2 ter- 

 nately parted, segments 2-3 lobed or pinnatitid, lobes oblong or sub- 

 linear, obtuse ; heads 6" in diameter exclusive of the ligules which are 

 5" long ; flowers all yellow ; scales of the involucre 16-20, in about o 

 series, equal, acuminate, herbaceous; ligules 16-20, oval-oblong; flow- 

 ers of the disk many, tubes glandular; receptacle rather convex ; ache- 

 nia quadrangular, sub-clavate, nearly glabrous, striate, all fertile. Hall& 

 Harbour, 281. Canon City, Bnuidegee. Soda Springs, Porter. Twin 

 Lakes, Coulter. 



ACTINELLA ACAULIS, L. Caespitose, dwarf and acauleseeut, villous 

 pubescent or silky; cuudex perennial, simple or branching; leaves all 

 radical, spatulate or linear-obovate, entire, 1 / -2J / long ; scapes l / -6 / high, 

 usually leafless and bearing a single head, O'^-lo" broad; involucre of 

 2 rows of oval or oblong scales, equaling the disk ; rays 10-12, broadly 

 cuneate, 3-toothed. and often sprinkled with resinous atoms ; pappus of 



1 BAIIIA, Lagasea. Heads many-flowered," radiate; rays 5-30, pistillate, fertile; disk- 

 rtoAvers tubular, perfect, fertile ;" corollas glandular-hairy, 5-toothed. Involucre sub- 

 globose or campauulate; the scales appressed, in one or two rows. Receptacle convex 

 or conical ; naked branches of the style in the disk-flowers short, thickened at the apex, 

 and obtuse, or truncate, or with a conical fleshy appendage. Achenia narrowly tur- 

 binate or linear, 4-sided. Pappus a crown of short scarious nerveless or rarely 1 -nerved 

 and even awnless scales. 



2 ViLLANOVA, Lagasca, DC. Prod. 6, p. 75. Heads few-flowered, heterogamous. 

 Ray-florets 5-10, pistillate, ligulate, obovate, toothed at the apex. Flowers of the 

 disk perfect, fertile, tubular, terete, 5-toothed. Scales of the campanulate involucre 

 tew, iii 1 series. Receptacle flat, naked. Branches of the style in the disk-flowers 

 capitate, blunt. Acheiiia obpyramidal, wingless, punctate, glabrous. Disk epigynous, 

 minute. Pappus none. 



