92 PLANTS WITH TWO KINDS OF SEEDS. [CHAP. 



Durieu) which produces two kinds of seed (Fig. 56), 

 one somewhat flattened, short and broad, with rounded 

 angles ; the other elongated, hooked, and shaped like 

 a shepherd's crook with a thickened staff. 



Our common Thrincia hirta (Fig. 481^) also pos- 

 sesses, besides the fruits with the well-known feathery- 

 crown, others which are destitute of such a provision, 

 and which probably therefore are intended to take root 

 at home. 



SatiSize 

 Fig. 56. — Seeds oT Cotydatis heierccarpa. 



Mr. Drummond in the volume of Hooker's Journal 

 of Botany for 1842, has described a species of 

 Alismacece which has two sorts of seed-vessels ; the 

 one produced from large floating flowers, the other at 

 the end of short submerged stalks. 



The common Calendula of our gardens produces 

 on each head three forms of seeds — 



1. One which is hooked. 



2. „ winged. 



3. „ resembles a small caterpillar. 

 Before concluding I will say a few words as to the 



very curious forms presented by certain seeds and 



