Boottia.] CXLVI. HYDROCHARIDEE. (J. D. Hooker.) 663 
Densely tufted ; stem with bases of leaves 1-3 in. Leaves fleshy, submerged, 
sessile, oblong, obtuse, 12-18 by 2-3 in., green with purplish cross bands beneath, 
midrib very stout; upper (leaves 4-6 in. long, stout, petioled, oblong-ovate, deeply 
cordate with overlapping rounded lobes. Male spathe 3 in. either way, ampulli- 
form, compressed, mouth toothed, ribs many tuberculate. Flowers 1} in. diam., 
white with yellowish tinge. 
8. ENHALUS, Richard. 
_A submerged marine monœcious or diœcious herb; rootstock crinite 
with the remains of old leaves. Leaves narrowly linear, enclosed in twos 
or threes in a basal sheath. Male fl. many, minute, enclosed in a short 
compressed subsessile 2-leaved spathe, at length escaping and floating ; 
sepals and petals broadly elliptic; stamens 3, anthers subsessile, oblong ; 
pistillode 0. Fem. fl. much larger, solitary, sessile in a longer spathe, 
Scape spiral; sepals oblong, imbricate; petals longer, linear, subvalvate, 
wrinkled, staminodes 0; ovary ovoid with 6 papillose ridges, long-beaked, 
almost 6-celled; styles 6, bipartite, arms slender, fimbriate; ovules few on 
each placenta, anatropous. Fruit ovoid, beaked, indehiscent, deliquescent, 
spathe persistent, placentas nearly meeting in the centre, spongy. Seeds 
ew, large, conoid, testa mucilaginous; plumule many-leaved. 
E. Koenigii, Rich. in Mem. Institut. Fr. 1811, ii. 64; Mig. Fl. Ind. 
Bat. iii. 937. E. acoroides, Zoll. Verz. Ind. Archip. Pf. ii. 69; Boiss. Ft. 
Orient. v. 6; Ascherson in Nuov. Giorn. Bot. Ital. iii. 299, and in Linnea 
xxxv, 188. Stratiotes acoroides, Linn. f. Suppl. 268. Enhalus, Griff. 
Notul. 175; Ic. Pl. Asiat. t. 249, 950. E. marinus, Grif. l c. 178; 
Thwaites Enum. 332.—Rumph. Herb. Amboin. vi. 191, t. 75, È. 2. 
Shores of the Malay Peninsula, Griffith, Beccari. CEYLON, Thwaites, —DISTRIB. 
alay Seas, Australia. , , 
, Rootstock extensively creeping in sand. Zeaves 2-3 ft. by j-i in., margins 
thickened, tip rounded denticulate. Spathes 2 in. long, strigose. Ovary with pa- 
Pillose margins, Fruit raised to the surface for ripening. 
9. HALOPHILA, Thouars. 
Submerged marine plants. Leaves in pairs from the axil of a scarious 
or hyaline scale at every node of a slender creeping stem, petioled, ovate 
or oblong, penninerved. Spathes of both sexes small, of 2 bracts, solitary, 
Sessile between the pairs of leaves, 1l-fld. Male fl. pedicelled ; sepals 3; 
Petals 0 ; anthers 3, alternate with the sepals, subsessile, linear-oblong, 
pitrorse ; pistillode 0. Fem. fl. sessile; sepals 3, minute. Ovary long- 
9 5 l-celled; styles 3, filiform, papillose all over; ovules 2-seriate on 
parietal placentas. Fruit included, subglobose, beaked. Seeds many, 
Subglobose, testa membranous ; embryo thick with the spiral cotyledon ina 
cavity at the side. ; 
H. ovata, Gaud. in Freyc. Voy. Bot. t. 40, f. 1; leaves elliptic-oblong 
23 lanceolate. 'H. ovalis, Hook. J. Ýi. Tasm. ii. 45; Mig. Fl. Ind. Bat. in. 
ni Boiss, FI Orient. v. 9; Benth. Fl. Austral. vii. 182; Aschers. in Nuov. 
En Bot. Ital. iii. 301, and in Linnea xxxv. 173. Barkania punctata, 
Grif ' Sym. P hys. Bot. in Abhandl. Berl. Akad. i. 429. Diplanthera, 
pI le. Pl. Asiat. t. 161 C, £. 2. P Thalassia stipulacea, Miq. Fl. Ind. 
11. 226 (exol, citations). Caulinia ovalis, Br. Prodr. 339. 
