NYMJPHJEACEAL 101 



covered with mucilage; leaves alternate ; floating ones peltate ; those 

 submerged palmately divided into filiform segments ; flowers axillary 

 solitary long-pedunculate {Tropical and Subtropical America). See 

 p. 70. 



3. Brasenia Sciirer. — Flowers almost of Cabomba; stamens 

 ] 2— oo. Carpels 6- co ; ovules of Cabomba. Fruit of co drupaceous car- 

 pels and seeds of Cabomba. — Stem branched, covered wi+h mucilage ; 

 leaves all floating peltate entire ; inflorescence of Cabomba {America, 

 Tropical Asia, and Subtropical Australia). See p. 81. 



III. NYMPH.EA^3. 



4. Nuphar Sm.-— Flowers regular ; receptacle convex. Sepals 5, 0, 

 unequal imbricate. Petals indefinite, unequal imbricate, the inner 

 resembling stamens (staminodes) inserted in a spiral series, together 

 with co hypogynous free stamens ; filaments flattened ; anthers 

 introrse, 2-rimose. Germen superior ; apex tapering into a short style, 

 peltate disk-shaped above; stigmas co, linear radiate; cells co; ovules 

 co ; descending, anatropous, inserted on the sides. Fruit ovoid, 

 corticate carpels baccate, separable in decay. Seeds co; embryo and 

 albumen double {Cabomba); micropyle operculate. — Perennial herbs ; 

 rhizome thick, sigdlate ; leaves alternate floating peltate; flowers 

 axillary, solitary or in pairs ; fruit emerged {The Northern Hemisphere 

 beyond the Tropics). See p. 81. 



5. Nymphsea L. — Flowers regular ; receptacle concave cupuli- 

 form. Calyx 4deaved, imbricate, inserted with petals and stamens 

 of Nuphar, in a spiral series on the receptacle from the base to the 

 apex. Germen sunk in the receptacle, cc-locular, with a concave, 

 conical, or round process (the apex of receptacle) protruding vertically 

 from the centre ; styles free, exserted ; apex incurved, free. Ovules co 

 (of Nuphar). Berries spongy, surmounted by scars of perianth and 

 stamens, and by the style, pulpy, at length bursting irregularly. 

 Seeds co (of Nuphar) immersed in pulp, covered by a sacciform aril ; 

 operculum 0. — Herbs, with stem leaves and inflorescence of Nuphar ; 

 fruit maturing under water {All tropical regions, especially of Northern 

 Hemisphere). See p. S3. 



