ENCYCLOPHIDIA OF GARDENING. 
Opium Poppy (Papaver somniferum).—See Papaver. 
Oplismenus (Variegated Panicum).—Ord. Graminew. Green- 
house perennial, trailing grass. Orn, foliage. First introduced 1867. 
Flowers insignificant. Stems, small, wiry, trailing. Leaves, green, 
variegated with white and pink. 
CULTURE: Compost, equal parts peat, loam, leaf-mould, & sand. 
Position, small pots with shoots draping front of staging, or in baskets 
suspended from roof; sun or shade. Pot, March. Water freely March 
to Oct., moderately afterwards. Apply stimulants occasionally in 
summer. Temp., March to Sept. 60° to 75°; Sept. to March 55° to 65°. 
Propagate by cuttings of young shoots inserted in light sandy soil 
in small pots under bell-glass or hand-light in temp. 65° to 75° at any 
time. 
SPEOIES CULTIVATED: O. Burmannii variegatus (Syn. Panicum variegatum), 
trailing, ‘lropics. 
Opuntia (Indian Fig; Prickly Pear; Cochifieal Cactus; Barbary 
Fig).—Ord, Cactacez. Greenhouse & hardy succulent plants. First 
introduced 1596. Stems, fleshy, flat, bristly. Leaves, small, unim- 
portant, fugacious. 
CULTURE OF GREENHOUSE SPECIES: Compost, two parts sandy 
loam, one part powdered brick rubbish & old mortar. Position, sunny 
airy greenhouse or window. Pot, March or April in pots filled 3 of 
depth with potsherds, & just large enough to accommodate roots. Re- 
pot every three or four years only. Water moderately March to Sept. ; 
once a fortnight Sept. to Nov.; none afterwards. Apply stimulants 
to healthy plants, June to Sept. Ventilate freely in summer. Temp., 
March to Sept. 60° to 70°; Sept. to March 50° to 55°. 
CULTURE OF HARDY SPECIES: Soil, sandy loam, freely inter- 
spersed with powdered brick or old mortar. Position, sunny, well- 
rained rockeries. Plant, March or April. Cover surface of soil 
between plants with small pieces of stone. Sprinkle soot freely between 
plants occasionally to keep away slugs. Apply weak liquid manure 
occasionally during summer to healthy plants only. Propagate by 
seeds sown } in. deep in well-drained pots or pans of sandy soil in temp. 
75° in March. Keep soil moderately moist; cuttings of portions of 
stems exposed for a few days, then inserted in small, well-drained 
ides of lime & brick dust in temp. 65° to 75° summer; delicate species 
y grafting on robust kinds in April. 
GREENHOUSE SPECIES: O. arborescens, purple, June, 5 ft., U. States; 
Bigelovii, flowers not known, 10 ft., California; brasiliensis, yellow, June, 10 to 
15 ft., Brazil; cylindrica, scarlet, summer, 4 to 6 ft., Peru; and its orested variety 
oristata; decumana, orange, summer, 10 to 15 ft., 8. America; echinocarpa, green, 
summer, 18 in., U. States; Emoryi, yellow and purple, Aug. and Sept., 18 in., 
Mexioo; ficus-indica (Indian Fig), yellow, May, 2 ft., Trop. America; filipendula, 
purple, May and June, 2 ft., Texas; leucotricha, yellow, June, Mexico; monacantha 
variegata, variegated, 1 ft., 8. America; rosea, rose, June, Mexico; tuna, reddish 
orange, July, 10 to 20 ft., 5. America; Whipplei, red, June, U. States. 
HARDY SPEOIES: O. Engelmanni, yellow, May and June, 6 in., 8.U. States; 
mesacantha (Syn. vulgaris), the Prickly Pear, yellow, June, 2 ft., U. States; 
mescantha Raffinesquii, yellow and red, June, 1 ft.; missouriensis, yellow, May and 
June, 6 in., N. America, etc. 
Orach.—See Atriplex. 
Orange (Citrus aurantium).—See Citrus. 
Orange-ball Tree (Buddleia globosa).—See Buddleia. 
Orange Daisy (Erigeron aurantiacus).-—See Erigeron. 
Orange Lily (Lilium croceum).—See Lilium. 
Orange Monkey-flower (Mimulus glutinosus).—_See Mimu- 
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