688 



BOTANY 



PAST II 



unilocular and contains only one ovule ; it is formed of three, two, 

 or of a single cai^pel. The large size and feathery and papillose form 

 of the stigmas stand in relation to the wind pollination. Fruits 

 indehiscent. 



Family 1. Cyperaeeae. — The Sedges are characterised by their 

 triangular stems, which are usually neither swollen at the nodes nor 



Pig. 744. — Scirpus xetacevs. 1, plant in 

 flower ; 2, upper portion of a flo^vering 

 shoot ; 3, single flower ; A, the same from 

 behind ; 5, the same without the bract ; 

 6, fruit. (After Hoffmann. 1, nat. 

 size, the others x 2-6.) 



Fig. 745. — Eriopltornvi aiigiistifoliiiin. 1, lufloresJ 

 cence ; 3, a single spikelet ; 3, single flower; 

 /,, flower with bract removed ; 5, fruit. (Afte^ 

 Hoffmann ; 1, about nat. size ; the others 

 3-5.) 



hollow, and by their closed leaf-sheaths. The flowers are unisexua^ 

 and usually monoecious or are hermaj)hrodite ; ovary formed of twc 

 or three carpels with an erect, basal, anatropous ovule. Pericar] 

 not coherent with the seed-coat; embryo small, surrounded by the 

 endosperm. 



The genera Cyx>erus, Sdrxius, and Ei-iopJiorum have hermaphrodite flowers! 

 Fig. 744 rei)resents a plant of Sciiyus setaceus, which is an annual, in flowerl 

 Leaves rigid, channelled above. Fertile shoots with the uppermost internoda 

 elongated. Spikes 1-3, terminal ; enclosed by imbricating bracts and displaced 



