COMPOSITE FAMILY 243 



Plant in some part very woolly, at least when 

 young. 



Leaves spiny-toothed; thistles 40. Carduus, p. 267 



Leaves not spiny-toothed. 



Pappus of numerous slender bristles. 



Central flowers lacking either stamens or 

 pistils. 



No leaves over H in. wide IS. Antennaria, p. 253 



Lower leaves l /i in. or more wide 16. Anaphalis, p. 254 



Central flowers with both stamens and 

 pistils. 

 Heads white or greenish yellow, nearly 



sessile 17. Gnaphalium, p. 254 



Heads lilac, on slender peduncles 9. Lessingia, p. 247 



Pappus of flat white scales (leaves lobed)...30. Chaenactis, p. 260 

 Pappus none. 



Leaves triangular, 2 to 5 in. broad 18. Adenocaulon, p. 255 



Leaves narrower. 



Depressed annual, 1 in. high 14. Psilocarphus, p. 253 



Tall perennials 36. Artemisia, p. 261 



III. Chicory Tribe. 

 (Rays all strap-shaped.) 



a. Pappus none or very obscure 41. Phalacroseris, p. 267 



b. Pappus of scales or feathery from a scale-like 



base; flowers yellow 42. Microseris, p. 267 



c. Pappus feathery (the bristles branched) ; flowers 



not yellow 43. Stephanomeria, p. 268 



d. Pappus of simple bristles or hairs. 

 Akenes not flattened. 



Heads solitary on unbranched stalks from a 

 leafy base. 



Akenes sharp-toothed 45. Taraxacum, p. 269 



Akenes not toothed 48. Troximon, p. 269 



Heads several to numerous; stems branched 

 above. 

 Annual; white or pink-flowered; pappus 



falling away 44. Malacothrix, p. 268 



Perennials (except one yellow-flowered an- 

 nual) ; pappus persistent. 

 Akenes narrowed above; leaves deeply 



lobed 49. Crepis, p. 270 



Akenes broad at summit; leaves entire 



or toothed SO. Hieraceum, p. 271 



Akenes flat; leafy-stemmed plants. 



Flowers yellow; akenes not narrowed above 



to a beak 46. Sonchus, p. 269 



Flowers bluish; akenes short-beaked 47. Lactuca, p. 269 



Natural Tribes of the Compositae. 



The members of this large family may be grouped, so far as our species 

 are concerned, into ten natural divisions, or tribes. This grouping, however, 

 is based upon technical characters often too minute for the use of the 

 amateur and is here inserted only as a guide for the professional botanist. 

 Others will find the foregoing artificial key more useful. 



