228 CLIII, NAIADACEH (BENNETT). [ Vaias. 
7. N. horrida, 4. Br. in Magnus, Beitr. Kennt. Gatt. Najas, p. vii. 
and 46. Stems long, spreading, with short lateral branches and short 
internodes, forming at length dense bushy heads. Leaves faleate, 
with teeth longer than the leaf-widths and a rigid brown spine at the 
apex; sheaths broad, rounded-truncate, with 4—6 minute teeth. Male 
flower subellipsoid. Fruit tapering above. Seed marked with 20 rows 
of pits.—Rendle in Trans. Linn. Soc. ser. 2, Bot. v. 422 and 443, 
NV. pectinata, Magnus in Aschers. & Schweinf. Ill. Fl. Egypte, 145; 
Durand & Schinz, Conspect. Fl. Afr, v. 500. 
Upper Guinea. Senegambia: Lake Guier, Roger; Marsh of Walo, near 
Keurmbaye, Lepriewr. Niger Territory : Nupe; in a deep lake near Jeba, Barter, 
1065! Cameroons: Elephant Lake, near Barombi, Preuss, 452! Johann-Albrechts 
Hohe, Staudt, 488! 
Nile Land. Fazokl, S¢. Ange, 81! Bahr el Ghazal, Sehweinfurth, 1137! at 
the mouth of the River Jur, Schweinfurth, 1228! 
Mozamb. Dist. Lake Tanganyika, Hore ! 
Also in North and South Africa. 
8. N. interrupta, K. Schum. in Engl. Pfl. Ost-Afr. 0.94. Stem 
slender and wiry; internodes elongated. Leaves short, with 10-12 
teeth on the margins ; basal auricle truncate, entire. Female flowers 
with 2-3 stigmas. Fruit fusiform, dull yellowish.—A. Bennett in 
Dyer, Fl. Cap. vii. 51; Rendle in Trans. Linn. Soc. ser. 2, Bot. v. 423. 
Mozamb. Dist. German East Africa: in Lake Victoria at Kageyi, Fischer, 
614! 
Also in South Africa. 
N. australis, Bory, and N. madagascariensis, Rendle, occur in the Mascarene 
Tslands. 
8. CYMODOCBA, Konig; Benth. et Hook. f. Gen. Pl. iii. 1018. 
Flowers axillary, unisexual, or bisexual, in membranous sheaths. 
Perianth 0. Male flowers: Anthers 2, long, connate, stipitate, extrorse. 
Female flowers: Carpels 2, subsessile, ovoid, compressed, 1-ovuled; 
style short ; stigmas subulate; ovule pendulous, orthotropous. Fruit of 
2 ovoid carpels. Seeds pendulous ; testa thick; embryo inflexed.— 
Submerged marine plants, with rigid jointed and creeping rootstocks. 
Leaves oblong or linear, with stipular sheaths. 
Species 5-8? Shores of the Indian and Pacific Oceans. 
Leaves not terete. 
Leaves falcate . : 5 ‘ . ‘ . L. C. ethata. 
Leaves straight. 
Leaves broad . ; A . ; ‘ . 2. C. serrulata. 
Leaves 4 in. or less wide. 
Leaves 3-nerved ‘ : 5 . 4. C. australis. 
Leaves 7-nerved . ; : . 5. C. nodosa. 
Leaves 9—13-nerved 6 
3 
C. rotundata. 
Leaves terete, grooved 
| ©. isoétifolia. 
