162 KEY AND FLORA 



three suborders : I, Liguliflor^, the corollas all strap-shaped 

 and flowers all perfect ; II, Labiatiflor.e, corollas of all or 

 only the perfect flowers 2-lipped ; III, Tubulifer^, corolla 

 of the perfect flowers tubular and 5-lobed. To the latter 

 belong nine tribes, eight of which are represented by the 

 plants included. The figures refer to illustrations in Part I. 



Key to the Suborders axd Tribes of Composite 



Suborder I. — Liguliflo'r.^. All flowers ray flowers. 

 Herbs with milky juice. 



Suborder II. — Labiatiflo'r^. Corollas of all or only 

 the perfect flowers 2-lipped. Keceptacle naked ; anthers with 

 conspicuous tails ; style branches short, smooth, without 

 appendages. 



Suborder III. — Tubuliflo'r.e. Flowers tubular, the 

 outer ones only with rays, or the ray flowers entirely wanting. 

 The accompanying figures are to illustrate the descriptions of 

 the several tribes. They represent the style branches and 

 anthers as seen when magnified. 



Tribe 1. Eupatoria'ceje. Heads without rays. Flowers 

 all perfect, never yellow. Anthers without tails. Style 

 branches club-shaped. 



Tribe 2. Asteroi'de^. Heads with or without rays. 

 Anthers without tails. Style branches of disk flowers flat, 

 tipped with an appendage. Leaves all alternate. 



Tribe 3. Ixuloi'de.e. Heads usually without ray flowers. 

 Anthers with tails. Style branches of perfect flowers neither 

 truncate nor tipped with an appendage. 



Tribe 4- Ambro'si^. Heads without ray flowers. Anthers 

 distinct, not united. Style abortive, truncate. Corolla of 

 female flowers rudimentary or wanting. Pappus none. 



Tribe 5. Heliaxthoi'de.e. Anthers without tails. Style 

 branches of perfect flowers truncate or tipped with an append- 

 age. Bracts of the involucre not papery. Pappus never 

 capillary. Receptacle with chaffy scales mixed among the 

 flowers or only near those on the outside. 



