THE ESSENTIAL ORGANS. 41 



118. The number of the stamens is said to be definite when 

 not exceeding twenty, as is sometimes definitely expressed by 

 such terms as follow, compounded of the Greek numerals 

 viz., monandrous, having one stamen to each flower; diandrous^ 

 with two stamens ; pentandrous, with five stamens. If the num- 

 ber exceeds twenty, it is said to be indefinite (denoted thus, oo ) 

 or polyandrous. 



101 



Essential organ*. 99, Rhododendron, five stamens (s), one pistil (p), oblique or slightly irregular. 100, 

 Flower of ^Esculus (Buckeye), regular, 5-toothed calyx (c), very irregular 4-petalled corolla, seven stameni 

 unequal, one style (). 101, Flower of Hydrastis ; s, sepals deciduous. 



119. The position or insertion of the stamens ( 55 ) may 

 be more definitely stated here as hypogynous, on the receptacle 

 below the ovaries ; perigynous, on the calyx around the ovary ; 



102, Stamens (diadelphous) of a Leguminous plant. 103, Stamens (syngenesions) of a Composite: /. 

 filaments distinct; a, anthers united; s, stigmas revolute, etc. 104, Tetradynamous stamens of a Om- 

 cifer. 105, Gynandrous column of Cypripedium; o, ovary; r, torus; s, sterile stamen; a, two pollinia 

 c, stigma. 106, Didynamous stamens ot Lophospermum. 



epipetalouS) on the corolla, as in Phlox ; epigynous, qn the ovary 

 at its summit, and gynandrous (/uv^, pistil, avtfpss, stamens) on 

 the pistil, that is, when the stamens are adherent to the style, as 



