ENDOGENOUS OR MONOCOTYLEDONOUS PLANTS. 



483 



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

 greenish like the calyx. 



1085 1086 



1093 



1087 



1094 



904. Ord, Jlydrocharidacea} (the Frog's-lit Family) consists of a 

 few aquatic herbs, with dio3cious 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 - 6-celled ovary, more commonly one-celled with 

 three parietal placenta. Seeds numerous, without albumen. - Ex. 

 Limnobium, Vallisneria, Udora.* 



905. Ord, BurmanniaceSB consists of small, mostly tropical, annual 

 herbs, differing from Orchidacea? by their regular and perfect flow- 

 ers with three stamens. Ex. Burmannia, Apteria, of the South- 

 ern States. 



906. Ord, Orcllidaceae (the Orchis Family). Herbs, of varied as- 

 pect and form ; distinguished from the other orders with an adnate 



* ORD. BUTOMACE^E consists of Butoraus, Hydrocleis, &c. : plants re- 

 sembling the Alisma tribe, but with a milky juice, and the numerous seeds 

 attached to the whole inner surface of the carpels ! 



FIG. 1033. Raceme or spike of Triglochin palustre. 1084. Enlarged flower. 1085. A petal 

 and stamen. 1036. The club-shaped capsule. 1087. A magnified seed, exhibiting the raphe 

 and ehalaza. 1088. Embryo of the same, showing the lateral slit just above the radicular end 

 (634. where this structure is explained). 1089. Vertical section of the same passing through 

 the slit, bringing the plumule to view. 1090. Cross-section (more magnified), showing the co- 

 tyledon wrapped around the plumule. 



FIG. 1091. Leaf, and 1092, flower, of Alisma Plantago. 1093, More enlarged flower, with 

 the petals removed. 1094. Carpel, with the ovary divided, showing the doubled ovule. 1095. 

 Vertical section of the germinating seed of Alisma Damasonium: a, the cotyledon ; b, the plu- 

 mule ; c, the protruding radicle. 



