46 VASCULAR PLANTS. 



It- T ? • upper leaves opposite, lower verticil- 

 late. 



3. Cephalanthus, L. 



Flowers capitate. Limb of the calyx 4-den- 

 tate. Corolla tubular, blender, with 4-cleft 

 limb. Stamens 4, inserted in the throat of the 

 corolla. Style 1, exserted; stigma capitate; 

 ovary 2 — 4-locuLir; loculi 1-ovulate. 



J? . leaves opposite or verticillate, stipitate. 



ORDER m. GENTIANALES. 



Family viii. Asclepidiacese. 



Monadelphons. Anthers extrorse; their pol- 

 len changed into pollinaria. Ovaries 2; styles 

 2, united into a pentagonous stigma. Emit a 

 pair of follicles. Lactescent plants. 



1. Asclepias, L. 



Corolla rotate, 5-parted. Stamineal tube 

 short, expanding into a corona of five cncullate 

 processes, from the cavity of each of which, 

 rises a corniform process; loculi of anthers 

 separated, each connected to the loculus of the 

 neighboring one by an apical appendage; the 

 pollinia becoming supended over a gland, 6.Ye 

 of which protude frcm the margin of the stigma. 

 Seeds go, with a silky arillus. % . 



