Hydrilla.] CXLVI. HYDROCHARIDE&. (J. D. Hooker.) 659 
Flowers unisexual, solitary. Fruit winged. . . . . . . 6. OTTELIA. 
Flowers unisexual. Male spathes many-fld. Ovary stoutly 
beaked . . . . . . .. . tot t 
Tribe IV. Thalassiez. Salt-water herbs. Spathes 2-leaved. Ovary 
beaked in all. 
Male spathes many-fld. Perianth double . . . . . . . 8. ENHALUS. 
Male spathes 1-fld. Perianth single. . . . . . . . + 9. HALOPHILA. 
7. BOOTTIA. 
l HYDRILLA, Richard. 
A submerged leafy dicecious herb. Leaves short, 3-4-nately whorled, 
or the lower opposite. Male fi. solitary, shortly pedicelled, in a subglobose 
sessile muricate spathe; sepals 3, ovate or obovate, green ; petals 3, oblon g 
or cuneiform; stamens 3, anthers large reniform, opening elastically ; 
pistillode small. Fem. f. 1-2, sessile in a tubular 2-toothed spathe; 
perianth of the male, but leaflets narrower; ovary produced beyond the 
spathe in a filiform beak, I-celled ; styles 2-3, linear, undivided; stigmas 3, 
mbriate; ovules anatropous. Fruit subulate, smooth or muricate ; seeds 
2-3, oblong, testa shortly produced at each end. 
H. verticillata, Casp. in Monatsber. Akad. Berl. 1857; Pringhs. 
Jahrb, i. 493; Boiss. Fl. Orient. v. 8; Benth. Fl. Austral. vi. 259. H. 
ovalifolia, Rich. in Mem. Inst. Fr. 1811, ii. 76, t. 2; Thwaites Enum. 831 ; 
Dalz. & Gibs. Bomb. Fl. 377. H. dentata, Casp. in Bot, Zeit. 1854, 56. 
H. Wightii, Planch. in Ann. Sc. Nat. Ser. 3, xi. 79. H. angustifolia, Blume 
Mus. Bot. i. 82, Leptanthes verticillata, Herb. Wight. Serpicula verti- 
Cillata, Linn. f. Suppl. 416; Roxb. FI. Ind. ii. 578; Cor. Pl. ii. t. 164; 
Wall. Cat. 5048. Vallisneria verticillata, Roxb. Fl. Ind. iii. 751. Hot- 
tonia serrata, Willd, Sp. PI. i. 816. 
Still and slowly running waters throughout INDIA and CryLon.—DIstRIB. 
ntral Europe, Mauritius, Madagascar, Tropical Asia and Australia. — — 
Plants forming large masses, Leaves 43 in. 4-8 in a whorl, with a short 
sheathing one at the base of each branch and a short pair above this, linear or 
oblong-linear, serrulate or entire. Flowers i-l in. long; perianth segments very 
Variable, Fruit smooth or sometimes muricate or (in Ceylon, Thwaites) squarrose 
with filaments above the middle.— The male fl. escape from the sheath when mature, 
and float on the top of the water. 
2. LAGAROSIPHON, Harv. 
1 Submerged diœcious herbs. Leaves scattered, fascicled or subwhorled, 
ower Opposite, serrulate. Male fl. minute, many in an ovoid 2-fid axillary 
Sessile spathe ; sepals petaloid; petals rather shorter; anthers 2 or 3, ovoid, 
a often 3 staminodes ; pistillode 0. Fem. fl. solitary, sessile in a oduced 
into S Spathe ; perianth of the male ; staminodes 0; ovary oblong, produce 
0 filiform beak ; styles 3, stout, notched; ovules many, orthotropous. 
ruit ovoid, oblong or linear, many-seeded.—Species 5, India, Africa, and 
adagascar, ' 
L. Roxbur . s., . 2—4 in. scattered 
: ehii, Benth. . Pl. iii. 451 ; leaves 
deat lanceolate N J hamarndea e ernifolia, Thwaites Enum, 332. N. 
js "Urghii Planch. in Ann. Se. Nat. Ser. 3, xi. 78 (excl. syn. Roxb. Cor. 
)3 Dale. § Gibs. Bomb. Fl. 277. Vallisneria alternifolia, Roxb, Fl. Jnd. 
