58 SYNOPSIS OF THE FLORA OF COLORADO. 



1-nerved, l'-3' long, 3" -6" wide, pointed, smooth and glaucous, veins 

 prominently reticulated; heads in contracted corymbs; scales of the 

 involucre in 3 or 4 series, lacerate-fringed, outer ones oval, obtuse, gla- 

 brous, inner ones lanceolate, membranous, acute, purple-tinged, as long 

 as the disk; rays 14-17, purple or pinkish- white ; achenia smooth or 

 slightly pubescent. North Park, Hayden. Eagle River, Coulter. 



ASTER PTARMICOIDES, T. & G. South Park, Canby. Garden of the 

 Gods, Porter. 



ASTER ANGUSTUS, T. & G. Hall & Harbour, 291. 



TowNSENDiA 1 SERTCEA, Hook. Steinless, from a. simple or much 

 branched caudex, l'-2' high; leaves spatulate-linear, silky-can escent, 

 acute, 1-nerved, 12 // -15 // long, erect, surrounding and partly concealing 

 the heads (8" long) which are sessile or on very short peduncles ; scales 

 of the involucre subulate-lanceolate, pubescent, green in the center, 

 purplish towards the tip; margins scarious, lacerate-ciliate; rays long; 

 narrow, not spreading; pappus of the disk white, about as long as the 

 corolla, pappus of the ray of several unequal subulate bristles, much 

 shorter than the achenium and 1 or 2 long ones (sometimes 9 or 10) simi- 

 lar to those of the disk flowers ; achenium hairy, hairs minutely capi- 

 tate. Hall & Harbour, 290. Canon City, Brandegee. 



TOWNSENDIA GRANDIFLORA, Kutt. Strigose-canescent ; stems many, 

 from an annual root thickened at the summit, divaricately branched 

 from the base, central ones short, erect, the lateral decumbent 5'-10' 

 long, often proliferous ; leaves l'-2' long, somewhat succulent, linear- 

 lanceolate, acute, scattered, the uppermost bracteate at the base of the 

 heads; scales of the involucre lanceolate, subulate-acuminate, with 

 fimbriate-ciliolate margins, rays 25-30, pale lilac, with a short pappus 

 composed of lacerate-denticulate squainellge, very short; achenium 

 minutely hairy. Hall & Harbour, 289. Plains of the Platte, Coulter. 

 Colorado Springs, Porter; Redfield. 



MACELER ANTHER A 2 (DIETERIA) PULVERULENTA, Nees. Canescently 

 puberulent; stems 3'-6' high, much branched from the base, branches 

 spreading, bearing few heads on rather naked branchlets ; lower leaves 

 lanceolate, spinulose-serrate, upper ones linear, becoming entire ; scales 

 of the hemispherical involucre linear or lance-linear, very acute, imbri- 



1 TOWNSENDIA, Hook. Heads large ; the rose-colored or whitish rays in one series, 

 rather long, pistillate, sometimes infertile; disk-flowers perfect, with tubular obconic 

 5-toothed corollas. Branches of the style lanceolate, acutish, hairy towards the ends. 

 Involucres hemispherical or subglobose, of numerous rather large, imbricated and 

 appressed, scarious-margined, lacerate-fringed and often tinted scales. Achenia flat- 

 tene( , pubescent or hairy, 2-3 nerved. Pappus of numerous stout barbellate bristles, 

 that ( f the ray commonly shorter, or reduced in part or wholly to short subulate bris 

 ties < r little scales. Dwarf, stemless or branching, annual or perennial herbs, with 

 crowded, linear or spatulate, entire radical leaves. Natives of the mountainous regions 

 east of the Sierras, from the Saskatchewan to New Mexico. 



-MACH.ERANTHERA, Nees. Heads many-flowered; the rays conspicuous, pistillate, 

 fertile, in one species neutral ; disk-flowers perfect, the corolla tubular, 5-toothed. In- 

 volucre ovoid-hemispherical, the scales imbricated in several series, oblong or linear, 

 with spreading or recurved herbaceous points. Receptacle flat, honeycombed, the 

 cells with toothed edges. Appendages of the style narrowly lanceolate, minutely 

 hirsute. Anthers said to have "cultriform appendages." Pappus of numerous very 

 unequal scabrous and rather rigid bristles ; that of the ray flowers somewhat shorter. 

 Achenia obovate-f usif orrn, slightly compressed, indistinctly striate, pubescent or silky. 

 Herbs annual, biennial, or perennial, with branching stems and piunatifid, toothed, or 

 even entire leaves. Genus very near to Aster, but may be easiest distinguished from 

 it by the unequal pappus of disk and ray. Consists of four species found in the region 

 extending from Oregon to Colorado and southward to Mexico. 



