THE DAISY FAMILY. 



299 



B. — Flowers wholly white (corymbose). 



Stems one to three feet high ; florets of the ray five 

 to ten. 



Leaves linear, lanceolate, serrated 65. Sneezewort. 



Leaves six to eight inches long, narrow, and doubly 



pinnatifid, the segments hair-Hke 64. Yarrow. 



Stems three to four inches high ; shoots procum- 

 bent; leaves white underneath 39. Mountain Cudweed. 



C. — Flowers red, crimson, lilac, or violet. 



• Flowers appearing before the leaves expand, in a 



dense egg-shaped panicle, six to twelve inches 



high 44. Butterbur. 



• ♦ Flowers cotemporaneous with the mature leaves. 



Leaves opposite, in three to five broadly-lanceolate 

 coarsely-toothed lobes ; stems three to four 

 feet high ; flowers Ulac ; pistils longer than 



the florets 85. Lilac Hehpwort. 



Leaves alternate. 

 + Stem and leaves more or less thorny. 

 Leaves beautifully variegated with white veins ; 

 scales very long, thorny at the edges, and 



recurved 25. Milk-thistle. 



Leaves without white veins. 

 Inner scales large, yellowish, and spreading 

 horizontally. Plant rigid, dry, six to 



eighteen inches high 30. Caeline-thistle. 



All the scales green ; inner ones not longer. 

 Flower-heads large and few, far apart, and 

 very handsome. 

 Leaves decurrent. Scales with long and 

 very sharp points. 

 Heads erect. Pappus consisting of 



simple hairs 26. Spear-thistle. 



Heads drooping. Pappus consisting of 



featherj' hairs 24. Musk-thistle. 



Leaves not decurrent, soft, and almost 

 thornless. Scales obtuse, or with a 



very minute point 29. Melancholy- thistle. 



Flower-heads numerous, clustered, and in- 

 conspicuous. 

 Stem three to four feet high, slender, 

 scarcely branched ; very thorny 

 leaves, decurrent and recurved .... 27. Marsh-thistle, 

 Stem eighteen to twenty inches high ; 

 much branched , leaves scarcely 

 decurrent; scales appressed 28. Field-thistle, 



