NOTES ON EPILOBIACEAE.
The genus Lua'wrgia as it is now generally interpreted has always seemed to me to contain too many distinct generic types.
* A. Gray, Man. Ed. 6. 418.
I think Linnaeus' idea of holding Isnardia palustris generically separate from Ludwigia altendfolia is the proper way of disposing of these widely divergent species and their respective relatives. There are three clear generic lines in Lirdwzkzei as it is limited by most authors and I think it is much more satisfactory to treat these groups as separate genera than to associate them as sub genera in a composite genus.
I append a synopsis which will serve to emphasize the diag nostic characters : Leaves opposite ; stems prostrate or decumbent, creeping or floating.
Flowers sessile ; petals wanting or very small ; leaves petioled ; capsules short, sessile, straight, with a flat or depressed top. 1. Isnardia. Flowers long-stalked ; petals large and conspicuous ; leaves sessile ; capsules elongated, long-stalked, curved, with a prominent 4-lobed stylopodium.
2. Lua'wigantha.
Leaves alternate ; stems erect or ascending. 3. Ludwigia.