408 FLORA. 



Leaves green both sides; the veins very prominent on the lower surface; flowers pure 

 white, inodorous or very slightly scented; petals oblong, broader than those of 

 C. odorata, obtuse; fruit depressed-globose; seeds globose-ovoid, sessile, longer 

 than or about equalling the aril. Lake Champlain, west through the Great Lakes 

 to Mich., south to Del., Penn. and Ark. Summer. 



3. Castalia tetragona (Georgi) Lawson. SMALL WHITE WATER LILY. (1. 

 F. f 1533-) Leaves oval or oblong, 0.5-1 dm. long, green above, green or pur- 

 plish beneath, the sinus narrow ; petioles and peduncles nearly or quite glabrous ; 

 flowers white, inodorous; petals in about 2 rows, faintly striped with purple, oblong 

 or obovate, thin, about the length of the sepals. In the Misinaibi River, Ont. ; in 

 ponds along the Severn River, Keewatin; near Granite Station, northern Idaho. 

 Also in Siberia, Japan and the Himalayas. Summer. 



5. NELUMBO Adans. 



Large herbs, with thick rootstocks, long-petioled concave leaves, and small and 

 scale-like submerged ones borne sessile on the rootstock. Flowers large, yellow, 

 pink or white. Sepals imbricate. Petals and stamens oo, inserted on the calyx, 

 caducous. Filaments more or less petaloid; anthers introrse. Carpels distinct, 

 contained in pits in the large convex receptacle. Style short; ovules I or 2; endo- 

 sperm none; cotyledons thick, fleshy. Nuts globose, ovoid or oblong. [Ceylon 

 name for N. Nelumbo,] A genus of 2 species, one North American, the other 

 Asiatic and Australasian. 



Flowers pale yellow; plant native. i. N. lutea. 



Flowers pink or white; plant introduced. 2. N. Nelum'oo. 



1. Nelumbo lutea (Willd.) Pers. AMERICAN NELUMBO OR LOTUS. (I. F. f. 

 1534.) Rootstock tuberiferous. Emersed leaves 3-6 dm. broad, nearly orbicular 

 but often somewhat constricted in the middle, centrally peltate, prominently ribbed, 

 glabrous above, more or less pubescent and lepidote beneath, the lower surface 

 marked with an oblong, transverse area; petioles and peduncles thick, 0.9-2.2 m. 

 long, with several large air-canals; flowers 1-2.5 dm. broad; petals concave, obo- 

 vate, obtuse; anthers appendaged; fruit obconic or somewhat hemispheric, 7-10 

 cm. long; seeds nearly globular. Ont. to Mass., Fla., Minn, and Tex. July-Aug. 



2. Nelumbo Nelumbo (L.) Karst. INDIAN LOTUS. (I. F. f. 1535.) Leaves 

 6-9 dm. in diameter, concave, glaucous; petioles and peduncles 9-18 dm. long, 

 glabrous or with scattered minute prickles; flowers 1-2.5 dm. broad, pink or some- 

 times white; petals oblong or elliptic, obtuse; fruit obconic, 10-13 cm - l n g seeds 

 oblong or ovoid. Nat. in ponds about Bordentown, N. J. July-Aug. 



Family 2. CERATOPHYLLACEAE A. Gray. 

 Hornwort Family. 



Submerged aquatics, with slender branching stems, and verticillate 

 leaves, the monoecious or dioecious flowers solitary and sessile in the 

 axils. Perianth many-parted, the segments entire or toothed. Stamens 

 numerous, crowded on a flat or convex receptacle ; anthers sessile or 

 nearly so, linear-oblong, extrorse, the connective prolonged into a thick 

 appendage beyond the sacs. Pistillate flowers with a superior i -celled 

 ovary; ovule i, orthotropous, pendulous; style filiform, stigmatic at the 

 summit. Fruit an indehiscent nut or achene. Endosperm none ; embryo 

 composed of 4 verticillate cotyledons, with a short hypocotyl and a 

 plumule of several nodes and leaves. The family contains only the fol- 

 lowing genus : 



i. CERATOPHYLLUM L. 



Leaves crowded, linear or filiform, spinulose-sermlate, forked. Sterile flowers 

 with 10-20 stamens, the anthers alxmt as long as the perianth. Fertile and sterile 

 flowers generally at different nodes. Ovary and fruit somewhat longer than the 

 perianth, the fruit beaked with the long persistent style. One species or possibly 

 two, widely distributed in fresh water. 



