NYMPHAEACEAE. 



[VOL. II. 



2. Nelumbo Nelumbo (L.) Karst. 

 Indian Lotus. (Fig. 1535.) 



Xymphaea Nelumbo L,. Sp. PI. 511. 1753. 

 Xflnnibo n itcifera. Gaertn. Fruct. & Sem. i: 



73. pi. 19. 1788. 

 .\, lumbium speciosum Willd. Sp. PI. a: 1258. 



1799. 

 Nelumbo Nelumbo Karst. Deutsch. Fl. 553. 



1880-83. 



Leaves 2-3 in diameter, high exserted 

 above the. water or some of them floating, 

 thin, concave, glaucous; petioles and pe- 

 duncles 3-6 long, glabrous or with scat- 

 tered minute prickles; flowers ^-lo' broad, 

 pink or sometimes white; petals oblong or 

 elliptic, obtuse; fruit obconic, 4/-5' long, 

 3 / -4 / in diameter; seeds oblong or ovoid. 



Naturalized in ponds about Bordentown, N. 

 J., where it was introduced by Mr. K. I). Sturte- 

 vant. Native of India, Persia, China, Japan and 

 Australia. A superb plant, often cultivated. 

 July- Aug. 



Family 23. CERATOPHYLLACEAE A. Gray, Ann. Lye. N. Y. 4: 41. 



HORNWORT FAMILY. 



Submerged aquatics, with slender widely 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 following genus. 



i. CERATOPHYLLUM L. Sp. PI. 992. 1753. 



Leaves crowded in verticils, linear or filiform, spinulose-serrulate, forked. Sterile flowers 

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

 generally at different nodes, but sometimes in opposite axils at the same node. Ovary and 

 fruit somewhat longer than the perianth, the fruit beaked with the long persistent stj le. 



One or possibly two species, widely distributed 

 in fresh water. 



i. Ceratophyllum demersum L. 

 Hornwort. (Fig. 1536.) 



Ceratophyllum demersum L. Sp. PI. 092. 1753. 



Stems 2-8 long, according to the depth of 

 water. Leaves in verticils of 5's-i2's, linear, 

 2-3 times forked, the end of the segments capil- 

 lary and rigid, 4"-! 2" long; ripe fruit oval, 2"- 

 3 X/ long with a straight or curved spine-like 

 beak 2 // -4 // long, smooth and spurless or with a 

 long basal spur on each side, or tuberculate and 

 with narrowly winged spiny margins or broadly 

 winged without spines. 



In ponds and slow streams, throughout North 

 America except the extreme north. Several species 

 and varieties have been proposed, based on the 

 spurs, spines or wings of the fruit, but none of them 

 seem to be of any value. June-July. 



