THE MORPHOLOGY OF WEEDS 



127 



circles of the flower are united, this is adnation; perigynous 

 flowers are where pistils and stamens are inserted on the 

 calyx ; occasionally they are borne from the very summit ; 



Fig. 66. Flowers of barberry: c, 

 sepals; c', petals; s, stamens; p, pis- 

 til; a, anther; n, nectar gland; s', 

 stamen. 



Fig. 67. Flower of to- 

 mato ; small dark bodies, 

 lobes of calyx; inner, 

 larger lobes of petals. 

 Stamens removed. Pis- 

 til in center. (U. S. 

 Dept. Agrl.) 



cpigynous, that is adnate to the ovary ; the term hypogyn- 

 ous is used to designate when the parts of the flower are 

 free; such flowers are said to be superior, having a supe- 

 rior ovary ; when adnate to the calyx, inferior. 



The different types 

 of corolla are : Wheel- 

 shaped, like a tomato 

 flower, parts diverge 

 from the center; salver- 

 shaped or salver-form 



-r. 

 -c,x 



-~-st 



Fig. 68. Flower of tomato: ex, calyx; 

 c, corolla; p, pistil; st, stigma; s, sta- 

 men; o, ovary. (U. S. Dept. Agrl.) 



Fig. 69. Irregular 

 flower of bean, the 

 upper part stand- 

 ard or beaier, the 

 two lower wings 

 and the coiled keel. 



