896 CARDUACEAE 



and 1 cm. broad; bracts well imbricate; glandular green tips small, lanceolate. 

 Canons and meadows: Colo. SuhmonL — MonL S. 



23. M. spectabilis Greene. Biennial; stems several, 2-3 dm. high, glabrous 

 or nearly so; lower leaves oblanceolate, petioled, the upper linear and sessile; 

 involucres turbinate, about 1 cm. high and 12 mm. broad; bracts linear, acumi- 

 nate; tips almost as long as the chartaceous portion, glandular-puberulent; 

 hgules violet, 1 cm. long. Mountains: Colo. MonL Au. 



24. M. cichoriacea Greene, Biennial; stem stout, 3-6 dm. high; leaves 

 pale green, glabrous, lanceolate, sessile, 3-5 cm. long, runcinate-dentate; invo- 

 lucres turbinate, about 7 mm. high and broad; bracts linear, acute; tips short, 

 glandular-puberulent; ligules about 6 mm. long, violet. Hills and mountains: 

 Colo. — e Utah — N.M. — Aiiz. Son. — SuhmonL Au. 



25. M. Fremontii 



dm. hieh: basal leave 



4-5 



sharply dentate; upper leaves sessile, linear or lanceolate; heads over 1 cm. high; 

 bracts linear-lanceolate, cinereous; ligules purple, 8-10 mm, long. 

 Colo. Jl. 



_ ^ — J 



River bottoms : 



45. ERIGERON L. Fleabane. 



Annual 



,, , ,. ^ \., i- , , , ,T- , — "" >.capose. Leaves 



alternate, entire, toothed, or lobed. Heads solitary, corymbose, or paniculate, 



radiate or rarely discoid. Involucres hemispheric or saucer-shaped: bracts in 

 1-2, rarely 3 series, sub-equal or slightly imbricate ; receptacle flat, naked. Ray- 

 ttowers pistillate, white, pmk, or purple, rarely ochroleucous or yellow, or want- 

 ing. Disk-flowers perfect with yellow corollas. Anthers entire and obtuse at 

 the base, btigmas flattened, with mostly obtuse appendages. Achenes usually 

 flattened, 2-nerved,m a few species subterete and several-nerved. Pappus in a 

 single series of capillary scabrous bristles, or sometimes with a series of shorter 

 bristles outside. [Wyommgia A. Nels.] 



Bracts of the inv9lucre in 1-2 series of almost equal length, not thickened on the back 



^^^^rf^^'^^'^'^'l?'^' erect, or ascending, usually involute and iic^ved. num^^^^^ 

 often mside them a series of rayless pistillate flowers; leaves entire "''"''''".' 



Hays conspicuous, spreading, flat; no rayless pistillate flowers inside ^^"^^^• 

 Plant without rimners. 



Perennials mth rootstocks or woody caudices. 



Leaves dissected or deeply cleft. ' ttt pn\fPn«4TTT 



Leaves entu-e or merely toothed. <-uMFUbiii. 



Stems low. less than 2 dm. high, scapiform, usually bearing only one 



head; stem-leaves usuaUy reduced & ^ 



^^^'^^"i^il ^"^^ pedmicles vinous with many-celled hairs; bracts 

 comparatively broad. U Untflort 



luTOlucre and peduncles hirsute to glandular-puberulent or glabrate, 

 not long-\illous. *^ j^ RAmrATT 



Stem Ieafy,^^2-10 dm. liigh, if lower bearing several heads; stem-leaves 



Stems ^.^gsely cespitose from a tliick taproot; heads smaU, the 



disk rarely more than 1 cm. wide 



Pappus double; stem hirsute. V Pumili 



Pappus simple; stems strigose. VI ' DErtiMRFNTFS 



Stems usually sohtary from the ends of distinct (sometimes^ branched) 



rootstocks; heads large, the disk more than 1 cm. wide. 

 tracts with loose tips; rays broad; pappus simple; lower leaves 



broadly oblanceolate, the upper often reduced, 

 isracts villous. YU ei^vtiores 



Bracts glandular-puberulent or glabrous. 



V TTT ^ AT ^T^^'T^o^T 



Bracts appressed. except the very tips; rays narrow; pappus 



double; peremuals with short rootstocks. 

 upper stem-leaves ample, ovate to lanceolate, not much 

 smauer than the lower, which are more or less distinctly 

 3-nerved; peduncles usuaUy short, ascending. 



TT^^„„ ^* ™ 1 , , I^- AlACR.\XTHI. 



Upper stem-leaves reduced. Unear-lanceolate ; none of the 

 leaves 3-nerved; peduncles long and erect. 



Annuals or biennials or perennials by means of stolons and offsetf ^^^' 

 Stem-leaves broad, cordate-clasping; perennials with offsets. 



. Phiiadelphici. 



