THISTLE FAMILY 879 



convex, alveolate and often fimbrillate. Ray-flowers pistillate; ligules purple, 

 pink, or white. Disk-flowers perfect; corollas tubular with a bell-shaped throat 

 and short 5-lobed limb, yellow, changing into red, bro^\-n, or purplish. Anthers 

 obtuse at the base. Style-branches flattened, their appendages subulate, lanceo- 

 late, or ovate, acute. Achenes more or less flattened, nerved, or ribbed, gla- 

 brous or pubescent. Pappus of numerous, slender, white bristles in a single 

 series. 



Involucres and peduncles glandular. 



Leaves ovate, oval, or the lower obovate, sharply and coarsely serrate; bracts well 



imbricate, very unequal, broadly lanceolate, not thick. I. Conspicui 



Leaves lanceolate, oblong, or linear, entire or, if slightly toothed, bracts Unear-lanceo- 



late. almost equal in length. 

 Lower leaves petioled. 



Stems stout. 3-5 dm. high, leafy ; bracts lanceolate, firm, ascending. 

 Stem-leaves lanceolate to ovate; disk of heads 1.5-2 cm. broad. 



o^ t ,1. .. , . t , , ^^' IXTEGRIFOUI. 



Stem-leaves narrowly hnear; disk of heads about 1 cm. broad. 



^^ , , ^ ^ , , , III* Pauciflori. 



stem low, slender, few-leaved, 0.5-2 dm. high; bracts narrowly linear-lanceo- 

 late, with reflexed tips. IV. Kingiaxi 

 Leaves all sessile. 



Bracts narrowly linear, almost equal in length, attenuate. 



Leaves broadly lanceolate or oblong. V. Modesti 



Leaves linear VI. Campestres. 



Bracts tmck, oblanceolate, well imbricate; leaves oblong or lanceolate. 



T 1 ^ J , , , , ^"11- Oblongifoui. 



Involucres and peduncles not glandular. 



Outer bracts neither fohaceous nor equalling or surpassing the inner. 

 Bracts more or less pubescent on the back. 

 Bracts not bristle-pointed. 



Heads solitary; plant less than 3 dm. high; leaves oblanceolate or the upper 

 ^ linear. VIII. Alpeni. 



Heads corymbose or paniculate; plant over 3 dm. high. 



Upper leaves more or less claspmg and am^icled at the base. 



IX. JMOLLES. 



Upper leaves neither auricled nor clasping. 



Leaves obovate, broadly oblanceolate, oval or lanceolate, usually 

 more or less toothed ; bracts lanceolate, often tinged with purple. 



X. Radtjlini. 

 Leaves narrowly oblanceolate or linear, entire; bracts linear or 



oblanceolate, green-tipped. 

 Pubescence villous. XI. AxDixr. 



Pubescence hh^sute or strigose. XII. Grisei. 



Bracts bristle-pointed, squarrose. XIII. Multiflori. 



Bracts glabrous, except the cihate margins. 



Bracts linear, oblong or lanceolate, all acute or acutish. 



Lower leaves long-petioled ; blades cordate or ovate (rarely broadly lanceo- 

 late), usually more or less serrate. XIV. Sagittifolii. 

 Lower leaves oblanceolate. linear, or lanceolate. 

 Plants perfectly glabrous throughout. 



Bracts whitish-coriaceous below and with a distinctly rhombic 



green tip above; upper leaves clasping. XV, Laeves. 

 Bracts linear-subulate, green nearly throughout; leaves narrowly 

 linear, not clasping. XVI. Pohteriaxt. 



Upper part of the stem and peduncles with at least pubescent lines. 

 Heads usually nimierous in a leafy panicle or compound corymb. 

 Stem only with pubescent lines. XVII. SAHCiFOLn. 



Stem, at least above, pubescent on all sides. 



XVIII. LOXCHOPHTLLI. 



Heads few in a naked small corjmib. XIX. Occidextales. 



Bracts oblanceolate, the outer obtuse. XX. Adsoevdextes. 



Outer bracts foliaceous, equaUing or surpassing the inner. 



Heads rather nimierous in an open leafy panicle. XXI. Fiilcrati. 



Heads few, in a usually simple, racemose, or corjinbose inflorescence with nearly 

 erect branches. XXIL FOLiosi. 



I. Coxspicm. 



One species. 1. A. conspicuus. 



II. INTEGRIFOLII. 



Stem almost glabrous below; auricles of the thinnish leaves small; bracts narrowly linear, 

 lanceolate. 2. A, integrifolius. 



Stem hirsute-villous throughout; auricles of the thick leaves broad; bracts oblong or 

 lanceolate. 3. A, ample xifolius. 



III. Pauciflori. 



One species. 4. A. pauciflorus, 



IV. KINGIANI. 



One specise. ■5- -^^ -^i"<rti. 



