488 



ILLUSTRATIONS OF THE NATURAL ORDERS. 



quently tlie embryo) curved or doubled upon itself. Triglochin and 

 Sclieuchzeria chiefly constitute the suborder Juncagine^ ; where 

 the seed and embi-yo are straight, and the petals (if present) are 

 greenish like the calyx. Slightly acrid plants, and some of them 



astnngent. 



1221 



1222 1223 



1232 



1230 



1229 



1224 



1225 



1226 



1227 



1220 



1231 



1228 



935. Ord. ButomaceBC, represented by Butomus, the Flowering- 

 Rush of Europe, and three small tropical genera, is a form of the 

 last with many ovules attached to the whole face of the carpels : 

 these are separate or combined. Some have a milky juice. 



936. Ord. HydrocliaridacefE [Fror/s-Ut Family) consists of a few 

 aquatic herbs, with dioecious or polygamous regular flowers on scape- 

 like peduncles from a spathe, and simple or double floral envelopes, 

 which in the fertile flowers are united in a tube, and adnate to the 

 1 — G-celled ovary, more commonly one-celled with three parietal 

 placentae. Seeds numerous, Avithout albumen. — Ex. Limnobium, 

 Vallisneria, Anacharis. 



937. Ord. Orcllidacea; ( OrcJds Family). Herbs, of varied aspect 

 and form ; distinguished from the other orders with an adnate ovary, 

 and from all other plants, by their irregular flowers, with a perianth 



fig 1220. Kaceme or ppike of Triglochin palustre. 1221. Enlarged flower. 1222. A petal 

 and stamen. 1223. The club-shaped capsule. 1224. A magnified seed, exhibiting the rhaphe 

 and chalaza. 1-X!5. Embryo of the same. 1226. Vertical section of the same, bringing the 

 plumule to -view. 1227. Cross-section (more magnified), showing the cotyledon wrapped 

 around the plumule. 



FIG. 1228. Leaf, and 1229, flower, of Alisma Plantago. 12-30. More enlarged flower, with 

 the petals removed. 1231. Carpel, witli the ovary divided, showing the doubled ovule. 1232. 

 Vertical section of the germinating seed of Alisma Damasonium ; o, the cotyledon ; 6, the plu- 

 mule ; c, the protruding radicle. 



