CfEOSS ANAT0M7 OF PLOWEBlNO PLANTS, xxxi 



style of the pistil, as in the Orchids : such are said to be gynan- 

 drous. 

 Structure of Stamens. — Each individual stamen is composed of 



FiQ. xxvni. 



Fia XXEX. 



FiQ. XXVII. 



Fio. XXVII. — Androecium of monadelphous stamens. 

 FiQ. XXVIII.— AndroBoium of diadelpbous stamens. 

 Fio. XXIX. — Androecium of triadelpnous stamens. 



an anther, containing one or more pollen-sacs, borne upon a stalk 

 known as the filament. (Fig. XXX.) 



The principal terms which designate the structural relation be- 

 tween the anther and the filament are : 



Adnate, applied to anthers which are adherent to 

 the upper or lower surface (anterior or posterior) of 

 the filament; when on the upper surface the anthers 

 are introrse; when on the lower, extrorse. 



Innate, applied to anthers which are attached lat- 

 erally to the upper end of the filament, one lobe 

 being on one side, the other on the opposite one. 

 The part of the filament between the two anther- 

 lobes is designated the connective; it is subject to 

 many modifications of form, and often becomes sep- 

 arable by a joint at the base of the anther from the f^™™ „ gj; 

 rest of the filament. ament; 6,'an- 



Versatile is applied to anthers which are lightly 

 attached to the top of the filament, so as to swing easily; these 

 may also be introrse or extrorse. 



THE GTNCBCIUM. 



Numerical Terms. — Tlie gyncecium is made up of one or more 

 carpels (ca/rpids or carpophylla) — i.e., ovule-beaiing phyllomes, 

 and it is said to be mono-, di-,tri-, tetra-, penta-, etc., a,Bd poly- 



Fie. XXX.— 



