300 THE DAISY FAMILY. 



+t Stem and leaves entii-ely destitute of thorns. 

 Scales ending in hooks ; stem three to four feet 



high ; leaves broadly heart-shaped 22. Burdock. 



Scales not ending in hooks. 

 All the leaves much divided. 



Flowers few, large, far ajiart, and thistle-like, 

 the inner scales of the basket tinged 

 with 'purple ; leaves pinnatifid, their 



segments finely serrated 23. Saw-woex. 



Flowers very numerous, small, and crowded. 



Flowers in immense panicles, dull red; 



stems three to five feet high ; leaves 



white underneath 38. Mugwoet. 



Flowers in umbels or corj-mbs ; leaves long, 

 narrow, and triply pinnatifid ; the 

 segments hair-like ; stem eighteen 



inches high 64. Eose Yarro-w\ 



Leaves all, or at least the upper ones, simple 

 and undivided. 

 Leaves white underneath ; stems nearly 

 simple, four inches high; flower-heads 



unisexual ; scales pink 39. Mountain Cudweed. 



Leaves green on both sides, rough; stems one 

 to two feet high, branched ; flowers 

 thistle-like ; scales black and fringed.. 32. Hjlrd-heads. 



D. — Flowers sky-blue ; plant two to three feet high. 

 Leaves runcinate ; flowers sessile, axUlary, and in 



pairs 21. Field Chicoey. 



Leaves linear, entire, or nearly so ; flowers on long 



stalks ; plant hoaiy 31. Corn-flowee. 



E. — Scales of the basket brownish or gray ; stems 

 three to eighteen inches high, nearly covered 

 with white down ; leaves linear-lanceolate, un- 

 divided. 

 Flower-heads fine brown, in an elongated leafy) 40. Upright Brown Cud- 



spike ; stems unbranched J weed. 



Flower-heads in lateral or terminal clusters. 



Clusters surrounded by leaves much longer than 

 the heads; stem much branched and dif- 

 fuse 41. Spreading Cudweed. 



Surrounding leaves shorter, or scarcely longer. 

 Stem branched at the summit only ; the prin- 

 cipal head sessile i'l. Prolii krousCi. dweed. 



Stem repeatedly branched and forked from the 



base upwards 43. Least Cudweed. 



