240 LYTHRACEAE. 



Order 37. MYRTALES. 



Styles present; mostly land-plants. 



Hypanthium merely enclosing the ovary. 95- LYTHRACEAE. 



Hypanthium adnate to the ovary. 96. EPILOBIACEAE. 



Styles wanting; stigma sessile; aquatics. 97- GUNNERACEAE. 



Family 95. LYTHRACEAE Lindl. LOOSESTRIFE FAMILY. 



Hypanthium cylindric. i. LYTHRUM. 



Hypanthium campanulate or hemispheric. 2. AM MANIA. 



i. LYTHRUM L. LOOSESTRIFE. 



i. Lythrum alatum Pursh. In swamps from Mass, and S. D. to Ky. and 

 Colo. Alt. 5000-6000 ft. Near Boulder. 



2. AMMANIA L. 



i. Ammania coccinea Rottb. In swampy places from Ind. to S. D., Fla. and 

 Mex. ; also S. Am. Denver. 



Family 96. EPILOBIACEAE DC. EVENING PRIMROSE FAMILY. 



Flowers 4-merous. 



Fruit a many-seeded capsule, opening by valves. 

 Seeds with a tuft of silky hairs. 



Hypanthium not prolonged beyond the ovary ; flowers large. 



1. CHAMAENERION. 

 Hypanthium somewhat prolonged beyond the ovary ; flowers small. 



2. EPILOBIUM. 

 Seeds without a tuft of silky hairs, naked or tuberculate. 



Hypanthium not produced beyond the ovary ; flowers minute. 



3. GAYOPHYTUM. 

 Hypanthium produced beyond the ovary into a long tube. 



Stigma divided into 4 linear lobes. 



Stamens equal in length ; capsule terete or round-angled. 



Ovules and seeds horizontal, inserted in 2 or rarely more rows, 



prismatic-angled ; petals yellow. 4. ONAGRA. 



Ovules and seeds ascending, in one row, not angled ; buds drooping ; 



petals white or pink. 5. ANOGRA. 



Stamens unequal in length, the alternate longer ; capsule crested or 



winged ; plant acaulescent or low-stemmed. 

 Capsules with more or less distinct double crests on the angles ; 



seed furrowed along the raphe. 6. PACHYLOPHUS. 



Capsules winged or at least sharply angled on the angles. 

 Plants acaulescent, cespitose. 7. LAVAUXIA. 



Plants caulescent with wiry diffuse stems. 8. GAURELLA. 



Stigma discoid or capitate. 



Stigma discoid ; hypanthium-tube funnelform above. 

 Hypanthium-tube longer than the ovary ; stigma entire. 



9. GALPINSIA. 

 Hypanthium-tube shorter than the ovary ; stigma 4-toothed. 



10. MERIOLIX. 

 Stigma capitate. 



Plant acaulescent ; capsules 4-winged ; hypanthium-tube tubular- 



cylindric. u. TARAXIA. 



Plant caulescent ; capsules not winged ; hypanthium-tube obconic or 

 funnelform. 



