84 INFLORESCENCE. 



6th. Cyme, (Fi^. 90, c,) resembles an nrabel in having its common 

 stalks all spring n-om one centre, but differs in having those stalks 

 irregularly subdivided ; as the snowball and elder. 



Fig. 90. 



7th. Corymb, (Fig. 90, a,) or false umbel ; when the peduncles rise 

 from different heights above the main stem, but the lower ones being 

 longer, they form nearly a level or convex top; as the yarrow. 



8th. Fascicle, (Fig. 90, b,) flowers on little stalks variously insert- 

 ed and subdivided, collected into a close bundle, nearly level at the 

 top ; as the sweet-william ; it resembles a corymb, but the flowers 

 are more densely clustered. 



9th. Head, (Fig. 90, c,) or tuft, has sessile flowers heaped together 

 in a globular form ; as in the clover, and button bush, (cephalanthus.) 

 10th. Amcnt or catkin, is an assemblage of 

 flowers, composed of scales and stamens, or 

 pistils arranged along a common thread-like re- 

 ceptacle, as in the chestnut and willow ; this., 

 though described under the divisions of the 

 calyx, is only a mode of inflorescence. The 

 scales of the ament are properly the calyxes ; the 

 whole aggregate, including scales, stamens or 

 pistils, and filiform receptacle, constitutes the 

 ament. At Fig. 91, is the representation of the 

 ament of the poplar, containing pistillate flowers ; 

 this is oblong, loosely imbricated, and cyhndri- 

 cal; the calyx is aflat scale, with deep-fringed 

 partings. At ft, is a representation of the fertile 

 or pistillate flower ; the calyx or bract is a little 

 below the corolla, which is cup-shaped, of one 

 petal, and crowned with an egg-shaped, pointed 

 germ; the germ is superior, and bears four 

 (sometimes eight) stigmas. 

 The staminate ament resembles the pistillate, except that its co- 

 rolla encloses eight stamens, but no pistfl. The poplar is in the 

 class Dioecia, because the pistillate and staminate flowers are on 



Cyme— Corymb— Fascicle— Head— Ament. 



