2 CXXXI. HYDROCHARIDEZ (WRIGHT). | Hydrilla. 
Female spathe tubular, bidentate. Perianth segments 6, narrower 
than in the male. Staminodes 0. Ovary produced beyond the spathe 
into a long filiform beak, 1-celled; placentas 3, rarely 2; styles 3. 
Ovules few, anatropous. Fruit narrow, slightly exserted from the 
ruptured spathe. Seeds oblong; spermoderm slightly produced at each 
end.—Aquatic herb, with submerged, branched stem. Leaves verti- 
cillate. Flowers small, solitary in the axils of the leaves. 
This genus consists of a single variable species widely spread through Tropical Asia, 
the Mascarene Islands, and Australia. 
1. H. verticillata, Royle, IU. Bot. Himal. 376. Stem terete; 
lower internodes shorter than the leaves. Leaves 4 in a verticil, 
oblong, acute ; 4-6 lin. long, #~14 lin. wide, 1-nerved, dentate. Other 
characters as in the generic description.—Presl. Bot. Bemerk. 112; 
Engl. Pf. Ost-Afr. ©. 95. Serpicula verticillata, Roxb. Corom. Pl. t. 164. 
Nile Land. British East Africa: Buddu (ex Engler). 
Mozamb. Dist. German East Africa: Karagwe, Bukoba (ex Engler). 
Var. B. brevifolia, Casp. in Pringsh. Jahrb. i. 415. Lower internodes much longer 
than the leaves. Leaves ovate or ovate oblong, 2-3 lin. long, 1-1 lin. wide, Baker 
in Trans. Linn. Soc. xxix. 152; Engl. Pf. Ost-Afr. C. 95. 
Wile Land. Sources of the Nile, 2° N., Speke and Grant! 
2. LAGAROSIPHON, Harv.; Benth. et Hook. f. Gen. Pl. iii. 450. 
Spathes unisexual. Male ovate, 2-fid at the apex, many-flowered. 
Calyx 3-lobed; lobes narrow. Petals 3, ovate. Stamens 3; anthers 
ovate. Staminodes often 2-3. Female narrowly oblong, 1-flowered. 
Calyx and corolla similar to those of the male. Ovary 1-celled, 
shortly rostrate, with 3 parietal placentas; styles 3, erect; ovules 
many, orthotropous.—Stems elongated, branched, clothed all over 
with leaves. Leaves alternate, subopposite or (in Z. hydrilloides) 
whorled, linear or linear lanceolate. Spathes axillary, solitary. 
One species extends to South Africa, another is confined to the Mascarene Islands, 
and a third to India. 
Female spathe entire or nearly so. 
Leaf with 26-33 teeth. Petals lanceolate 1. L. Nyasse. 
Leaf with 30 teeth. Petals ovate : : ; . 2. L. rubella. 
Leaf with 51-59 teeth. 2 spathe with 2-3 teeth at 
the side S S S i S : 3. L. Schweinfurthii. 
Leaf with 81-87 teeth. 9 spathe without teeth . 4, L. Steudneri, 
Female spathe bifid. 
Leaves alternate or subopposite. 
Leaves 4-5 lin. long, setaceous. 9 spathe not dentate 
at the sides S : ‘ A : ; - 5. L. tenuis, 
Leaves 6 lin. long, setaceous.  spathe dentate at 
the sides : 7 : “ ` 6. L. muscoides, 
Leaves 6-7 lin. long, $ lin. broad, 3-nerved 7. L. crispus. 
Leaves 6-11 lin. long, 3 lin. broad, 1-nerved 8. L. cordofanus. 
Imperfectly known specie : S . 9. D. Fischeri. 
Leaves verticillate : . 10. L. hydrilloides. 
