ENCYCLOPMDIA OF GARDENING. 
species in a temp. of 65° to 70° in Feb., March, or April; division of 
old plants in March. 
SPECIES CULTIVATED: H. arborescens, white, fragrant, summer, 4 to 6 ft., 
U. States; aspera, white, summer, 4 ft., China; sinensis, white, summer, 2 to 6 ft., 
China; Hortensia, white or blue, spring and summer, 3 to 4 ft., and its varieties, 
Lindleyi (japonica), white or blue, otaksa, flesh, stellata, pink, rose, or pale blue, 
Thomas Hogg, white, and tricolor, leaves variegated; involucrata, rosy lilac or 
pink, summer, 6 to 10 ft., Japan; paniculata, white, summer, 4 to 6 ft., Japan; 
paniculata hortensis (Syn. floribunda and grandiflora), larger-flowered; petiolaris, 
white, June, climbing, Japan; quercifolia, white, July, 4 to 6 ft., Florida; Thun- 
bergii, rose or blue, summer, 3 ft., Japan. 
Hydrocharis (Frog-bit)._Ord. Hydrocharidacewa. Hardy aqua- 
tic perennial. Stems floating. 
CULTURE: Soil, muddy. Position, shallow ponds, lakes, or rivu- 
lets. Plant, March or April. Propagate by creeping shoots detached 
from plant & inserted in mud under water in March or April. 
SPECIES CULTIVATED: H. Morsus-Rane, green and white, summer, Europe 
(Britain). 
Hydrocleis.—Ord. Alismacew. Hardy aquatic perennial. First 
introduced 1831, 
CULTURE: Soil, two parts loam and one part leaf-mould. Position, 
sunny, shallow ponds or tubs sunk in ground. Plant 6 in. below 
surface of water in March. In cold districts plants best wintered in 
frost-proof greenhouse. Propagate by seeds in pots of rich soil sunk 
in water or division of roots 1n spring. 
SPECIES CULTIVATED: H. Commersonii (Syn. Limnocharis Humboldtii), yellow, 
July to Sept., Buenos Ayres. 
Hymenocallis.—Ord. Amaryllidacew. Stove & greenhouse 
bulbous plants. Evergreen & deciduous. First introduced 1758. 
Flowers, fragrant. 
CULTURE: Compost, two parts sandy loam, one part decayed 
manure and half a part silver sand. Position, well-drained pots in 
sunny part of stove & greenhouse. Pot, March. Repotting necessary 
every three or four years only. Water abundantly April to Sept., 
moderately Sept. to Dec., keep quite dry Dec. to March. Apply liquid 
manure once or twice a week May to Sept. Temp. for stove species, 
70° to 80° March to Sept., 55° to 65° Sept. to March; greenhouse species, 
55° to G5? April to Sept., 45° to 50° Sept. to April. Propagate by offsets 
removed from old bulbs in March and treated as above. 
STOVE SPECIUS: H. macrostephana, white, spring, 2 ft., hybrid; ovata, white, 
autumn, 1 ft., W. Indies; speciosa, white, spring, 1 ft., W. Indies, 
GREENHOUSE SPECIES: H. calathina, white, spring, 1 {t., Peru. 
Hymenophylium Cio aedee Fern; Filmy Fern).—Ord. 
Filices. Stove, greenhouse, half-hardy ferns. Fronds, feathery, deli- 
cate, membraneous. 
CULTURE OF STOVE AND GREENHOUSE SPECIES: Compost, 
equal parts peat, loam, leaf-mould, charcoal, sandstone, & silver sand. 
Position, moist, shady, in damp recesses of rockeries, under bell-glasses 
or in cases. Plant, March. Water freely March to Oct., moderately 
Oct. to March. Syringing unsuitable. Shade most essential. Temp. 
for stove species, 65° to 75° March to Oct., 55° to 65° Oct. to March; 
greenhouse species, 65° to 75° March to Oct., 55 to 65 Oct. to March; 
prec anonee species, 55° to 60° March to Sept., 45° to 55° Sept. to 
arch, 
CULTURE OF HARDY SPECIES: Compost as above. Position, 
deep, moist, shady frames, pits, caverns, or tubs; away from direct 
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