NYMPHAEACEAE. 407 



1. Nymphaea advena Soland. Large Yellow Pond Lily. (I. F. f. 1527.) 

 Floating and emersed leaves 1-2.5 dm. Droa< L ovate or orbicular-oval, thick, the 

 sinus generally open; submerged leaves, when present, thin-membranous, nearly- 

 orbicular; petioles, peduncles and lower surfaces of the leaves often pubescent; 

 flowers 3-9 cm. in diameter, depressed-globose, yellow or tinged with purple; 

 sepals 6, oblong, about 3 mm. long; petals oblong, 8-10 mm. long; stamens in 5-7 

 rows; anthers about the length of the filaments; stigmatic disk undulate, yellow, or 

 pale red; fruit ovoid, not deeply constricted into a neck, 3-5 cm. long. In ponds 

 and slow streams, Labrador to the Rocky Mts., Fla., Tex. and Utah. April-Sept. 

 Rev. Thos. Morong (Bot. Gaz. n: 167) describes a var. (?) minor having smaller 

 flowers, the margins of the stigmatic disk more crenate, rays 10, and fruit only 2.5 

 cm. long. Called also Cow-lily and Spatter-dock. 



2. Nymphaea hfbrida Peck. Red-disked Pond Lily. (I.F. f. 1528.) Float- 

 ing leaves 0.5 -1.5 dm. long, sometimes pubescent beneath; submerged leaves 

 generally present, membranous, orbicular; flowers 2.5-4 cm. broad, yellow; 

 sepals 5 or 6; petals 6-8 mm. long, less fleshy than those of the last; anthers 

 nearly the length of the filaments; stigmatic disk crenate, bright red or crimson; 

 stamens in about 5 rows; fruit about 2.5 cm. long, contracted below into a neck. 

 In ponds and slow streams, Vt. to Ont., N. Y., Penn. and Mich. May-Sept. 



3. Nymphaea Kalmiana (Michx.) Sims. Small Yellow Pond Lily. 

 (I. F. f. 1529.) Leaves 0.5-1 dm. long, commonly pubescent beneath; submerged 

 ones always present, membranous, orbicular, larger; flowers 2.5 cm. in diameter 

 or less, yellow; sepals 5; petals 4 mm. long; stamens in 3 or 4 rows, narrowly 

 linear, the anther one-fourth the length of the filament; stigmatic disk crenate or 

 stellate, 4-6 mm. broad, dark red; fruit ovoid, with a short neck. In ponds and 

 slow streams, Newf. to N. Y., Penn., Minn, and Saskatch. Summer, flowering later 

 than the two preceding. 



4. Nymphaea sagittaefolia Walt. Arrow-leaved Pond Lily. (I. F. f. 1530.) 

 Floating leaves glabrous, obtuse. 2-4 dm. long; submerged ones numerous, similar, 

 but membranous and commonly larger; flowers yellow, about 2.5 cm. broad; 

 sepals 5; petals broadened above, 6 mm. long; stamens in 4 or 5 rows, the fila- 

 ments about equalling the anthers; stigmatic disk crenate, n-15-rayed; fruit 

 ovoid, not constricted into a neck. In ponds, S. Ind. and 111., and in the Atlantic 

 States from N. Car. to Fla. Summer. 



4. CASTALIA Salisb. 



Herbs with horizontal perennial rootstocks, floating leaves and showy flowers. 

 Sepals 4. Petals imbricated in several rows, 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 oo , 

 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 25 species, of wide geographic distribution. 



Flowers 0.7-1.5 dm. broad, fragrant ; leaves orbicular, purplish beneath. 1. C. odorata. 

 Flowers 1-2.5 dm. broad, not fragrant ; leaves orbicular, green both sides. 



2. C. t iiber osa. 

 Flowers 2.5-4 cm « broad, not fragrant ; leaves oval or oblong. 3. C, tetragona. 



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

 Water Lily. Pond Lily. (I. F. f. 1531.) Rootstock thick. Leaves 1-3 dm. 

 in diameter, glabrous above, more or less pubescent beneath, cordate-cleft or reni- 

 form; petioles and peduncles with 4 main air-channels ; flowers white, or tinged 

 with pink; petals narrowly oblong, obtuse; fruit globose, or slightly depressed; 

 seeds stipitate, oblong, shorter than the aril. In ponds and slow streams, Newf. to 

 Manitoba, Fla. and Tex. June-Sept. 



Castalia odorata rosea (Pursh) Britton. Flowers large, deep pink or red. E. Mass. 

 to N. J., near the coast. 



2. Castalia tuberosa (Paine) Greene. Tuberous White Water Lily. 

 (I. F. f. 1532.) Rootstock with numerous lateral tuberous-thickened branches. 



