THISTLE FAMILY 241 



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

 late, with refle.xed 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. Oblongifolii. 

 Involucres and pedvmcles 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 soUtary; plant less than 3 dm. high; leaves oblanceolate or the upper 



linear. VIII. Alpixi. 



Heads corymbose or paniculate: plant over 3 dm. liigh. 



Upper "leaves more or less clasping and auricled at the base. 



IX. MOLLES. 



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. Radulini. 

 Leaves narrowly oblanceolate or linear, entire; bracts Linear or 

 oblanceolate, green-tipped . 

 Pubescence villous. XI. Andini. 



Pubescence hirsute or strigose. XII. Grlsei. 



Bracts l)ristle-pointed, squarrose. XIII. Multiflori. 



Bracts glabrous, e.xcept 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, Unear, or lanceolate. 

 Plants perfectly glabrous throughout. 



Bracts wliitish-corlaceous below and with a distinctly rhombic 



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

 Bracts linear-subulate, green nearly throughoiit; leaves narrowly 

 linear, not clasping. XVI. Porteriani. 



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

 Heads usually numerous in a leafy panicle or compoimd corymb. 

 Stem only with pube.scent lines. XVII. S.^LiciFOLll. 



Stem, at least above, pubescent on all sides. 



XVIII. LONCHOPHYLLI. 

 Heads few in a naked small corymb. XIX. Ocxidextale.s. 



Bracts oblanceolate, the outer obtuse. XX. Ad.scexdextes. 



Outer bracts foliaceous, equalling or surpassing the inner. 



Heads rather numerous in an open leafy panicle. XXI. Fulcr.\ti. 



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

 erect branches. XXII. FoLiosi. 



I. CONSPICUI. 



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. amplexifolius. 



III. Pauciflori. 



One species.- 4. a. pauciflorus. 



IV. KINGI.4NI. 



One species. 5. A. Kingii. 



V. Modesti. 



Stem not hispid; heads distinctly pedimcled; leaves slightly if at all auricled at the base 

 thin. 

 Stem, especially upwards, with scattered long silky hairs; leaves not auricled, usually 



somewhat hairy. 6. A. major. 



Stem glandular-puberulent or glabrous below, not long-hairy. 



Leaves and lower part of the stem glabrous, the former not auricled. 



7. A. modrstus. 

 Leaves short-pubescent, somewhat scabrous above; stem usually puberulent 

 throughout; leaves with small auricles. 8. A. Sayianus. 



Stem short-Iiispid ; heads crowded, often subsessile, subtended by bract-like leaves; 

 leaves thick, strongly auricled at the base. 9. A. Novae- Angliae. ' 



VI. Campestres. 

 One species. . 10. A. campestris. 



VII. Oblongifolii. 

 Leaves scabrous-hirsutulous, mostly spreading or reflexed. 11. A. Kumleini. 



Leaves glabrous, except the bristly-ciliate margins, ascending. 12. A. Fendleri. 



VIII. Alpini. 



One species. 13. A. alpinus. 



IX. Molles. 



One species. 14. A. Jessicae. 



