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, brown, 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. COXSPICUI. 



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



II. IXTEGRIFOLII. 



Stem-leaves narrowly linear; 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. KINGIANI. 

 Leaves all sessile. 



Bracts narrowly linear, almost equal in length, attenuate. 



Leaves broadly lanceolate or oblong. V. MODESTI. 



Leaves linear. VI. CAMPESTRES. 



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



VII. OBLOXGIFOLII. 

 Involucres and peduncles not glandular. 



Outer bracts neither foliaceous 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. ALPINI. 



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



Upper leaves more or less clasping and auricled at the ba.se. 



IX. AlOLLES. 



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. KADULINI. 

 Leaves narrowly oblanceolate or linear, entire; bracts linear or 



oblanceolate, green-tipped. 



Pubescence villous. XI. AXDIXI. 



Pubescence hirsute or strigose. XII. GRISEI. 



Bracts bristle-pointed, squarrose. XIII. MULTIFLORI. 



Bracts glabrous, except the ciliate 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. PORTERIAXI. 



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

 Heads usually numerous in a leafy panicle or compound corymb. 

 Stem only with pubescent lines. XVII. SALICIFOLII. 



Stem, at least above, pubescent on ah 1 sides. 



XVIII. LOXCHOPHYLLI. 



Heads few in a naked small corymb. XIX. OCCIDEXTALES. 



Bracts oblanceolate, the outer obtuse. XX. ADSCEXDEXTES. 



Outer bracts foliaceous, equalling or surpassing the inner. 



Heads rather numerous in an open leafy panicle. XXI. FULCRATI. 



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

 erect branches. XXII. FOLIOSI. 



I. COXSPICUI. 

 One species. 1. A. conspicuus. 



II. IXTEGRIFOLII. 



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. amplexifolius. 



III. PAUCIFLORI. 



One species. 4. A, pauciflorus. 



IV. KlNGIAXI. 



One specise. 5. A. Kingii. 



