Fig. 55. Specialized stamens of the Cabombaceae and Nymjohaeaceae showing vas- 

 cular anatomv', position, and dehiscence of the sporangia. The sporangia are united 

 in pairs by endothecial tissue. 1, 2, abaxial views and cross sections of Cabomha 

 aquatica and C. caroliniana, respectively showing anatomy simple, dehiscence 

 latrorse-extrorse in 1, A- A, and varying from c.\trorse, B—B, to latrorse-extrorse, 

 A-A in 2; 3, Nuphar variegatum, anther sacs protuberant in pairs, connective mas- 

 sive; 4, Brascnia schreheri, anther sacs semiprotuberant, dehiscence latrorse; 5, 

 Nelumbo iiiicifera, vascular supply complex, filament strands five, twisting and re- 

 orienting in their course {B-B, C-C, D-D), evidence of differential growth in de- 

 velopment of terete from laminar filament. (After Moseley.) 



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