12 DIOECIA. DECANDHIA. 



tago. Are the stamina also really monadelphous? and 8t6 

 12? " alternated upon an axis forked at its summit!" Ob^. 

 Seeds hirsute; capsules globose and recurved. Radicles 

 pubescent, 



800. ^ UDORA. Elodea. Michaux, 



Spathe bifid. '—Masc. Ca/i:r 3 -parted. Corol- 

 la of 3 petals. Stamina 9, 3 of them interior. 

 Fem. Calix 3-parted, tube very long. Petals 

 3. Sterile filaments 3. Uiriculus about S~seed- 

 ed. Seeds rjlindric. 



A submersed aquatic; roots fixed; stem diffusely dichn' 

 tomous; leaves entire, verticillated in 3s and 4s; flowers 

 axillary, very small and evanescent, the female emerg-- 

 ing; the male migrator)', breaking off connection usually 

 widi the parent plant, it instantly expands to the light, 

 the anthers also burst with elasticity and the granular 

 pollen vajiuely floats upon the surface of the water. 

 Grains of pollen didymous, or ^hlobed^ lobes nearly sphe- 

 rical. Gemmuieofthe seed inverted. 



U- ca?iadejisis. Leaves verticillate in 3s and 4s; oblong- 

 linear, mmutely subserrulate, partly obtuse. 



Elodea canadensis Mich. SerpicnlaTerticiUata.M\.\\i\. 

 Catal. p. 84 S. oc«V/e72/a(V*. Ph. 1. p. 33. Haf. In still 

 v/atevs, from Canada to Virgniia. The plant without 

 flowers resembles an aquatic moss (such as Tetraphis peJ- 

 lucida.) Utriculus l-celled, conic. Tube of the calix 

 filitbrni, 4 to 12 inches long. For a figure of the seed of 

 this genus, which appears to hold an intermediate station 

 betwixt Vallisneria and Hydrocharis, see Annales du Mu- 

 seum, 17. p. <!32. 1. 1. f. 30. Flowers scarcely larger than 

 those of a Jungermannia; petals of the male flower ligu- 

 late-spathulate; stigmas of the female 3, ligulate, reflected 

 and bifid, partly crested. 



Serpicula verticiilata of Roxburg, is probably a se- 

 cond species of this very distinct genus. 



Order X.— DECANDRIA. 



)1. CARICA. L. (Fapaw Tree.) 



Masc. Calix scarcely any. Corolla S-cIeft, 

 funnelform. Filaments in the tube of the coroi- 



