242 THE FLORA. 



3 E. bellidifo'lium. Daity F. Leaves nearly entire. Kays 50-80, bluish -p. 



4 E. Fhiladel'phicnm. Leaves nearly entire. Rays 150-200, reddish-purple. 



5 E. querciib'linm. Oak-lv. F. Lvs. sinuate-pinnutifid-toothed. Rays 100-200. 8. 



E. an'mram. Annval F. Stein leafy, 3-5f. high. Leaves coarse-toothed. 

 7 E. strigo'stun. Rough F. Stem leafy, 2-3f. high. Leaves nearly entire. 

 S E. nudicau'le. Naked F. Stem leafless, 1- 2f. high. Rays about 30. 8. 



7. ACHILLE'A. Yarrow. Millfoil. 



Heads many -flowered, rays few, fertile; receptacle flat, chaffy ; acbenia 

 flattened, margined, without a pappus. U European herbs with small, 

 4-12-rayed heads in corymbs. June -Sept. 



1 A. millefo'linm. Leaves twice pinnatifld with fine segments. Rays 4 or 5. c. 



2 A. Ptar'mica. Sneezewort. Leaves undivided, lance-linear, serrate. Rays 8-12. r, 



8. TARAX'ACUM. Dan'delion. 



Involucre many-flowered, double, the outer of small scales much shorter 

 than the close, erect row of the inner. Receptacle naked. A chenia pro- 

 duced into a long beak crowned with copious white, hair-like bristles of 

 the pappus. Acaulescent herbs with runcinate leaves. (Figs. 504-506.) 



T Dcns-leo'nis. Dan'delion. Outer scales of the involucre reflexed. Leaves run 

 cinate, smooth, dentate. In all open situations, blossoming at nil seasons ex- 

 cept winter. Scape round, hollow, lengthening after flowering, and bearing a 

 globular head of seeds and seed-down, whose light and airy form <s H very famil 

 iar sight to all. 



9. HIERA'OIUM. Hawkweed. 



Involucre more or less imbricated, egg-shaped, many-flowered. Ache- 

 nia not prolonged into a beak, striate. Pappus of rough, brittle, numerous 

 tawny bristles in a single row. U Leaves alternate, entire, or toothed 

 Florets yellow. July-Sept. 



* Involucre and stalks smooth or nearly so a 



Involucre, stalks, &c., rough with glandular hairs.... b 



a Heads with 50 to 60 florets 1 



a Heads with 10 to 20 florets. . . .2, 8 

 b Heads with 40 to 50 florets. . . .4 

 b Heads with 20 to 30 florets 5, 6 



1 H. Canaden'se. Canada H. Stem leafy, corymbed at top. Leaves sharp- 

 toothed. N. 



