488 



ILLUSTRATIONS OF THE NATURAL ORDERS. 



quently ilic embryo) curved or doubled upon itself. Triglocliin and 

 Sckeuchzeria chiefly constitute the suborder Juncaginejk ; where 

 the seed and embryo are straight, and the petals (if present) are 

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

 astringent. 



93o. Orth Blltomacea\ 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. 



93G. Ol'll. IlydrOCharidaCClB {Froc/s-bit Family) consists of a fe^ 

 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, without albumen. — Ex. Limnobium, 

 Vallisneria, Anacharis. 



937. Ord. Orcllidacea? ( Orchis Family). Herbs, of varied aspect 



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



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



FIG 1220. Raceme or spike of Triglochin palustrc. 1221. Enlarged flower 1222 A petal 

 and stamen. 12C3. The club-shaped capsule. 1224. A magnified seed, exhibiting the rhaphe 

 and rhalaza. 1225 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 1C30. More enlarged flower, with 

 '•e petals removed. 1231 Carpel, with the ovary divided, showing t'.ie doubled ovule. 1C31. 

 .ertiral section of the germinating seed of Alisma Damasonium ; o, the cotyledon ; 4, the plu- 

 mule ; c, the protruding radicle. 



