Order 70.— ASTERWORTS. 231 



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



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



5 E. quercifo'lium, Oak-lv. F. Lvs. sinuate-pinnatifid-toothed. Eays 100-200. S. 



6 E. 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. 



8 E. nudicau'le. Naked F. Stem leafless, l-2f. high. Kays about SO. S. "^ 



7. ACIIILLE'A. Yarrow. MillfoiL 



Heads many-flowered, rays few, fertile; receptacle flat, chaff*y ; achenia 

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

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



1 A. millefo'lium. Leaves twice pinnatifid with fine segments. Kays 4 or 5. c. 



2 A. Ptar'mica. Sneezewort. Leaves undivided, lance-linear, serrate. Kays 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. 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 reflexed. 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 i very famil- 

 iar sight to all. 



9. HIERA'CIUM. 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, Ac, 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 SO florets 5, 6 



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

 toothed. N. 



