Genus i. 



WATER LILY FAMILY. 



3. Nymphaea sagittaefolia Walt. Arrow-leaved 

 Pond Lily. Fig. 1841. 



Nymphaea sagiltacfolia Walt. FI. Car. 155. 17S8. 

 Niiphar sagittaefolia Pursh, Fl. Am. Sept. 370. 1814. 



Floating leaves narrowly ovate or ovate-lanceolate, gla- 

 brous, obtuse, 8'-i5' long, 2-3' wide; submerged ones 

 numerous, similar, but membranous and commonly larger ; 

 flowers yellow, about i' broad ; sepals 5 ; petals broadened 

 above, 3" long; stamens in 4 or S rows, the filaments about 

 equalling the anthers; stigmatic disk crenate, ii-15-rayed; 

 fruit ovoid, not constricted into a neck, about i' long. 



In ponds and streams, eastern North Carolina and South 

 Carolina. Recorded as occurring in ponds fnow drained') in 

 southern Indiana and Illinois. Plants of the Gulf States for- 

 merly referred to this species prove to be distinct. Alligator- 

 bonnets. Summer. 



2. CASTALIA Salisb. in Konig & Sims, Ann. Bot. 2: 71. 1805. 



Aquatic herbs, with horizontal perennial rootstocks, floating leaves and showy flowers. 

 Sepals 4. Petals m, imbricated in few to many series, inserted on the ovary, gradually pass- 

 ing into stamens; stamens 00, the exterior with large petaloid filaments and short anthers, 

 the interior with linear filaments and elongated anthers. Carpels ^, united into a compound 

 pistil with radiating linear projecting stigmas. Fruit globose, covered with the bases of the 

 petals, ripening under water. [A spring of Parnassus.] 



About 40 species, of wide geographic distribution. Type species : Castalia piidica Salisb. 

 Flowers 3'-5^' broad, fragrant; leaves orbicular to reniform, purplish beneath. i. C.oclorala. 



Flowers 4'-9' broad, not fragrant ; leaves orbicular, green both sides. 2. C. tubcrosa. 



Flowers I'-i^i' broad not fragrant; leaves oval. 3. C.tctragona. 



I. Castalia odorata (Dryand.) Woodv. & Wood. Sweet-scented White Water 

 Lily. Pond Lily.' Water Nymph. Water Cabbage. Fig. 1842. 



Xyiupliaea odorata Dryand. in .\it. Hort. 



Kew. 2 ; 227. 1789. 

 Castalia pudica Salisb. in Konig. & 



Sims, Ann. Bot. 2: 72. 1805. 

 Castalia odorata Woodv. & Wood in 



Rees' Cyclop. 6: no. i. 1806. 

 Nymphaea odorata var. minor Sims, 



Bot. Mag. pi. i6}2. 1814. 

 Nymphaea odorata var. rosea Pursh, Fl. 



Am. Sept. 369. 1814. 



Rootstock thick, simple or with 

 few branches. Leaves floating, orbic- 

 ular or nearly so, 4'-i2' in diameter, 

 glabrous, green and shining above, 

 purple and more or less pubescent 

 beneath, cordate-cleft or reniform, 

 the sinus open but sometimes narrow; 

 petioles and peduncles slender, with 

 4 main air-channels; flowers white, 

 or sometimes pink, 3'-6' broad, fra- 

 grant ; petals numerous, in many 

 rows, narrowly oblong, obtuse; fruit 

 globose, or slightly depressed ; seeds 

 stipitate, oblong, shorter than the aril. 



In ponds and slow streams, Newfoundland to Manitoba, south to Florida, Louisiana and Kansas. 

 Toad-lily. June-Sept. 



