ENCYCLOPHDIA OF GARDENING. 
ANNUAL SPECIES: 0, linifolia (Venus’s Navel-wort), white, June, 6 to 9 in., 
8. Europe. 
PERENNIAL SPECIES: 0. Lucilim (Rock Navel-wort), blue, summer, 6 in., 
Agia wines verna (Creeping Forget-me-not), blue, spring, 6 in., Europe; verna 
alba, white. 
Oncidium (Butterfly Orchid).—Ord. Orchidacew. Stove & green- 
house epiphytal orchids. Flowers appear at base of new pseudo-bulb 
wee latter is fully grown. First introduced 1791. 
CULTURE: Compost, two parts fibrous peat one part of equal pro- 
portions of sphagnum moss and charcoal. Position, pots, wood or 
earthenware baskets, rafts or blocks. Pot, Feb. or March. Fill pots 
or pans two thirds of their depth with potsherds. Place layer of moss 
on this, then fill remainder of space with compost to lin. above rim. 
Put plants on this, cover roots with compost & layer of moss, and secure 
firmly with copper wire. Baskets: Line interior with moss, then fill 
with compost and place plant on top, securing it firmly with copper 
wire. Blocks: Place roots next wood, cover with peat and sphagnum 
moss, and secure firmly with copper wire. Water plants on blocks twice 
daily in summer, once a day other times; those in pots & baskets once 
a day April to Sept., twice a week Sept. to Nov. and Feb. to April, 
once a week afterwards. Syringe lightly daily in summer. Moist at- 
mosphere highly essential. Shade from bright sunshine only. Ven- 
tilate freely in summer. Temp. for stove species, Nov. to April 60° to 
70°; April to Nov, 70° to 85°; for greenhouse species, May to Oct. 
65° to 75°; Oct. to May 55° to 65°. Growing period, March to Sept. ; 
resting period, Oct. to Feb. Propagate by division of pseudo-bulbs at 
potting time, 
STOVE SPECIES: O. ampliatum, yellow, red, and brown, March to May, 12 
to 16 in., Central America; jonesianum, white, brown, and red, Oct. to Feb., 1 ft., 
Paraguay; kramerianum, red, brown, and yellow, March to Oct., 8 to 10 in., 
Ecuador; lanceanum, yellow, rose, purple, and brown, summer, 18 in., Guiana; 
Fariie (Butterfly Orchid), red, crimson, and yellow, March to Oct., 8 to 10 in, 
W. Indies. 
GREENHOUSE SPECIES: O. concolor, yellow, May, 6 in., Brazil; crispum, red, 
brown, and yellow, June to Feb., 1 ft., Brazil; Forbesii, red, and yellow, autumn, 
2 to 8 ft., Brazil; incurvum, white and yellow, fragrant, autumn, 1 ft., Mexico; 
macranthum, yellow, brown, white, and purple, spring, 18 in., Trop. America; 
marshallianum, yellow and brown, summer, 1 ft., Brazil; ornithorynchum, rose, 
lilac, and yellow, 1 ft., Mexico; phalenopsis, white, purple and violet, spring, 1 to 
2 ft., Ecuador; sarcodes, yellow and brown, spring, 1 ft., Brazil; sphacelatum, 
brown and yellow, spring, 2 ft., Mexico; splendidum, yellow and brown, winter, 
1 ft., Guatemala; superbiens, yellow, brown, and purple, spring, 1 ft., Colombia; 
tigrinum, yellow and brown, violet scented, autumn and winter, 1 ft., Mexico; 
Varieosum, yellow and brown, winter, 1 ft., Brazil; varicosum Rogersii, superior 
varie Ye as 
Onion.—See Allium. 
Onion-plant (Ornithogalum longibracteatum).—See Ornithoga- 
lum. 
Onoclea (Seusitive Fern; Ostrich Fern).—Ord. Filices. Hardy 
deciduous fern. First introduced 1799. Fronds, barren ones, broad, 
once divided, green; fertile ones, narrow, contracted, once divided, 
brown. 
OUTDOOR CULTURE: Soil, two parts good loam, one part leaf- 
mould. Position, semi-shaded cool moist border or margin of ponds. 
Plant, April. 
POT CULTURE: Compost, two parts fibrous loam, one part leaf- 
mould, one part sand. Position, well-drained pots in shady cold frame 
or greenhouse. Pot, March or April. Water copiously, April to Sept. ; 
moderately Sept. to Nov.; keep nearly dry Nov. to March. Repot 
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