144 FLOBA OF PHILADELPHIA. 



Pistil 1 ; petals none ; leaves whorled, all submerged and dissected. 



Fam. 2. Cexatophyllaceae. 

 Land or marsh plants (some Ranunculaceae aquatic). 



Stamens numerous; -sepals .dist} 110 *:; , petals present (except in some 

 Ranunculaceae). 

 Receptacle not hollow; leaves alternate (except in Clematis). ,. 

 Flowers perfect (except in some .species of ,plejnatis 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. t 



Sepals 3; petals 6; shrubs or trees. 



Fam. 4. Anonaceae. 

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

 , , , ^any, , Fam. 5, Ranunculaceae. 



Anthers opening by valves' (except in Podophyllum) ; 

 pistil 1. Fam. ■ 6. Berberidaceae. 



Dioecious climbing vines with simple leaves; fruit drupaceous. 

 , , Fam. 7. Memspermaceae. 



Beceptacle hollow, enclosing the numerous pistils' and' achenes; 

 opposite-leaved shrubs. Fam. 8..' • . Calycam.thaceae. 



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-Jily Family. . 



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

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



, ■ , Leaves peltate, entire, , floating. , , 2. Brasenia. 



Sepals 4-6; petals numerous of several; carpels united; ovules numerous. •' 

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



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



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



5. Neltmbo. 



1. CABOMBA Aubl. 

 1. Cabomba CaroLiniana A. Gray. M. p. 406. Ponds and slow streams^ 

 Summer. 

 Camden — Timber Creek (Br.). 

 New Castle— Established in Fish Ponds. 



2. BRASENIA Sehreb. 



1. Brasenia purpurea (Miehx.) 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. Spatter Dock. M. p. 407. Still or stagnant 

 water., Summer. 



