]44 FLOE A OF PHILADKLFEIA. 



Pistil 1; petals nonej leaves whorled, all submerged and dissected. 



Fam. 2. Ceratophyllaeeae. 

 Land or marsh plants (some Eanunculaceae aquatic). 



Stamens numerous; sepals distinct; petals present (except in some 

 Eanunculaceae). 

 Eeceptacle not hollow; leaves alternate (except in Clematis). 



FlovFers perfect (except in some species of Clematis and Tha- 

 lictrum). 

 Fruit aggregate, cone-like ; trees ; sepals and petals in 3 



series or more, of 3. Fam. 3. Magnoliaceae. 



Fruit not aggregate; the carpels separate, at least when 

 mature. 

 Anthers not opening by valves; pistils usually more 

 than 1. 

 Sepals 3; i^etals 6; shrubs or trees. 



Fam. 4. Anonaceae. 

 Sepals 3-15; petals (when present) about as 

 many, Fam. 5. Banunculaceae. 



Anthers opening by valves (except in Podophyllum) ; 

 pistil 1. Fam. 6. Berber idaceae. 



Dioecious climbing vines with simple leaves; fruit drupaceous. 



Fam. 7. Menispermaceae. 

 Eeceptacle hollow, enclosing the numerous pistils and achenes; 

 opposite-leaved shrubs. Fam. 8. Calycanthaceae. 



Stamens 9-12, in 3 or 4 series of 3; anthers opening by valves; aro- 

 matic trees or shrubs with no petals, more or less united sepals, and 

 1 pistil. Fam. 9. Lauraceae. 



Family 1. NYMPHAEACEAE DC. Water-lily Family. 



Sepals and petals 3 ; stamens 6, hypogynous ; carpels distinct ; ovules few. 



Leaves dissected, excepting the small floating ones. 1. Cabomha. 



Leaves peltate, entire, floating. 2. Brasenia. 



Sepals 4-6 ; petals numerous or several, carpels united ; ovules numerous. 



Petals small or minute; stamens hypogynous. 3. NymiyJiaea. 



Petals large, numerous, stamens epigynous. 4. Castalia. 



Sepals 4-5 ; petals numerous ; carpels distinct, immersed in the receptacle. 



5. Nelumbo. 



1. CABOMBA Aubl. 

 1. Cabomba Caroliniana a. Gray. M. p. 406. Ponds and slow streams. 

 Summer. 

 CoTn den— Timber Creek (Br.). 

 New CastZe— Established in Fish Ponds. 



2. BEASENIA Schreb. 

 1. Brasenia purpurea (Michx.) Casp. Water-shield. M. p. 406. Ponds 

 and slow streams. Summer. 



3. NYMPHAEA L. Spatter-dock. 



Leaves 1-3 dm. long; stigma 12-24-rayed; petals truncate, fleshy. 



1. N. advena. 

 Leaves 0.5-2.5 dm. long; stigma 7-10-rayed; petals spatulate, thin. 



2. N. variegata. 



1. Nymphaea advena Soland. ^patier Dock. M. p. 407. Still or stagnant 

 water. Summer. 



