NYMPHAEACEAE. 



135 



Castalia zanzibarensis (Gasp.) Britton, ZANZIBAR WATER LILY, of Zanzi- 

 bar, with ovate-orbicular, long-petioled leaves with a deep basal sinus, their 

 margins somewhat sinuate, the long-peduncled flowers bright blue, with about 

 20 oblong petals 1'-1A' long, was seen blooming in a tank at Orange Valley in 

 1914, where it had been grown for several years. [Nymphaea Zanzibar ensis 

 Gasp.] 



Lefroy records failure in establishing Nymphaea coerulea Sav., and N. 

 dentata Sch. & Thoum. 



Nelumbo Nelumbo (L.) Karst., INDIAN LOTUS OR SACRED BEAN, Asiatic, 

 with long-petioled erect, orbicular, concave, centrally peltate leaves 1 or more 

 in diameter, and pink flowers 6'-12' broad, the oblong or elliptic petals obtuse, 

 ia occasionally grown in tanks. It represents the related family NELUMBONA- 

 CEAE. [Nymphaea Neluiribo L. ; Nelumbo nu'cifera Gaertn.] 



Family 2. CERATOPHYLLACEAE A. Gray. 

 HORNWORT FAMILY. 



Submerged aquatics, with slender stems, and verticillate pectinate rigid 

 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 1-celled ovary; ovule 1, ortho- 

 tropous, pendulous; style filiform, stigmatie at the summit. Fruit an inde- 

 hiscent nut or achene. Endosperm none ; embryo composed of 4 vertieillate 

 cotyledons, with a short hypocotyl and a plumule of several nodes and 

 leaves. The family contains only the following genus: 



1. CERATOPHYLLUM L. 



Only the following species, which is abundant in ponds and ditches through- 

 out temperate Xorth America and in Cuba. [Greek, horny leaf.] 



1. Ceratophyllum demersum 



L. HORNWORT. DITCHWEED. (Fig. 

 158.) Stems HV7 long. Leaves 

 4"-12" long; ripe fruit oval, 2"-3" 

 long with a 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. 



Bermuda, according to Rein, 

 and also listed by Hemsley ; common 

 in Pembroke Marsh, according to 

 Lefroy. Not found by recent col- 

 lectors, but admitted here because 

 it could not well have been mistaken. 

 Presumably native. The description 

 of this species by H. B. Small ap- 

 plies to the Water Hyacinth, Piaro- 

 pus cra-ssipes, a curious error. 



