74 SYNOPSIS OF THE FLORA OF COLORADO. 



nial, canescent; stems 8'-lU' high, branching; leaves sessile, piima- 

 tifid, the rachis and remote lobes linear; heads rather small ; involucre 

 in about 2 series, nearly equal to the disk; rays deeply 3-cleft; chaff of 

 the pappus lanceolate; fimbrilhe of the receptacle aristreform, slender, 

 sparse, longer than the achenia. Purgatory Kiver, Dr. Bell. 



GAILLABDIA PULCHELLA, Foug. Annual, pnberulent, or slightly 

 hirsute, branching; leaves lanceolate, the lower ones tapering at the 

 base and slightly petioled, somewhat toothed or rarely incised, the 

 upper entire, partly clasping, apiculate-acumiuate ; involucre very hir- 

 sute and callous at the base, longer than the disk ; heads V or more in 

 diameter; rays 10-12, attenuate at the base, deeply 3-cleft, violet-purple, 

 the teeth yellow; corolla of the disk with attenuate, subulate teeth; 

 chaff of the pappus ovate, or lanceolate-oblong, with long awns; tiru- 

 brillie of the receptacle arista^form-subulate, not dilated at the base, 

 slender, longer than the achenia; achenia involucrate with a villous- 

 ferruginous tuft. Plains of Eastern Colorado, Dr. Bell. 



PALAFOXIA 1 HOOKEEIAXA, T. & G., (P. Texana, Hook.) Plant l-2 

 high, strigose-scabrous ; branches paniculate or corymbose ; leaves 

 lanceolate, 1-3 nerved; heads 9" long, many-flowered, radiate j scales 

 of the involucre 12 or more, very glandular as well as the peduncles 

 and branches, imbricated in 2 series, exterior lanceolate, interior obovate- 

 lanceolate or oblong; rays 8-10, more or less exserted, purple, broadly 

 cuneiform, deeply '* cleft; limb of the disk-corolla 5-cleft below the 

 middle ; pappus of the disk-flowers of t>-8 narrowly-lanceolate, acu- 

 minate scales as long as the attenuated, hairy achenium, in the rays ot 

 as many obovate-spatulate, very obtuse, rigid scales, many times 

 shorter than the nearly glabrous achenia. Rail & Harbour, 352. 



Cn^ENACTis 2 DOUGLASII, Hook. & Arn. (C. achillctcfolia, H. & A.) 

 " Biennial and sometimes annual, whitened with a close tomentuin, or 

 rarely smoothish ; stems 2-3 high, simple or much branched, often 

 several from one root ; leaves somewhat fleshy, I'-.')' long, ovate, 

 oblong in outline, 2-3 pinnatifld Avith very numerous and often 

 crowded, minute oblong or obovate, rounded lobes; heads few-many, 

 corymbed ; involucres turbinate or campauulate, the oblong-linear scales 

 in 1-2 series ; tlowers 6" 7" long, whitish or flesh-colored ; corollas 

 pubescent, marginal ones scarcely larger ; achenia linear, hispid, 

 blackish, as long as the corolla; pappus of about 10 unequal and 

 oblong or lanceolate, erosely-deuticulate scales, i- as long as the 



, Lagasca. Heads, 10-30 flowered; the tlowers all perfect and tubular. 

 or tlit> exterior series either imperfectly or manifestly radiate ; the rays 3-cleft, pistil- 

 late, .scales of the obeoiiical or eampanulate involucre 8-15, membranous or her- 

 baceous with scarious tips, appressed (or spreading in fruit,) in 1-2 series, shorter 

 than the disk. Receptacle small, flat, naked or slightly alveolate. Corolla of the 

 disk with a slender tube and an expanded deeply .Vclci't or :Vp;nted limb: the lobes 

 linear or lanceolate, spreading, glabrous. Branches of 1 he style lony; and liliform, 

 Hattish, glandular-pubescent throughout. Achenia quadi-angular, slendt-r, tapering 

 to the base, minutely pubescent. Pappus of G-l^membramu-eous. d'nticulate,pinnately 

 striate scales, furnished with a strong midnerve, which is thickened at the base and 

 often somewhat produced at the apex; the pappus of the exteiior tlowers of fen much 

 shorter. T. j- G. FL X. Jw. 



- 1 Cii.EXATis, DC. Meads niauy-ilowered ; tlowers all tubular and perfect; the 

 corollas glabrous or puberuleut, elongated, narrowly obconic or ampliated above and 

 trumpet-shaped. 5-toothed ; the outer ones (rays) more expanded than the rest and 

 often somewhat irregularly ventricose, 5-cleft ; teeth or lobes pubescent. Involucre 

 rampanulate ; the scales oblong-linear, about '20, in 1-2 rows. Receptacle alveolate. 

 Style with very long, narrowly-linear branches, the upper part hispid. Acheuia 

 linear, tapering to the base, striate or quadrangular. Pappus of 4-12 hyaline, mem- 

 branous, usually nerveless scales, with erosely-dentieulate margins, those of the disk 

 tlowers usually much shorter. 



