242 THE FLORA. 



3 E. bellidifc'lium. Daisy F. Leaves nearly entire. Kays 50-80, bluisli -p. 



4 E. Fhiladel'phicum. Leaves nearly entire. Eays 150-200, reddish-purple. 



5 E. quercifo'lium. Oak-It). F. Lvis. sinuate-pinnatifid-toothed. Eays 100-200. 8. 

 3E an'nuum. Annual F. Stem leafy, 3-5f. high. Leaves coarse-toothed. 



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

 S E. nudicauae. Naked F. Stem leafless, l-2f. high. Eays about 30. S. 



7. ACHILLE'A. Yarrow. MnifoiL 



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

 flattened, margined, without a pappus. — li European herbs with small, 

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



1 A. millefc'lium. Leaves twice pinnatifid with fine segments. Eays 4 or 5. c. 



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



8. TAR AX' A CUM. Dan'delion. 



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

 than the close, erect row of the inner. Receptacle naked. Achenia 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. Dens-leo'nis. Dan'delion. Outer scales of the involucre refiexed. Leaves run- 

 cinate, smooth, dentate. — In all open situations, blossoming at all 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 is '^ very famil- 

 iar sight to all. 



9. HIERA'CIUM. Hawkweed. 



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

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

 tawny bristles in a single row. — % 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, 3 



b Heads with 40 to 50 florets 4 



b Heads with 20 to 30 florets 5, 6 



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

 toothed. N. 



