ENCYCLOPEDIA OF GARDENING. 
Centaury Ce cae centaurium).—See Erythrea. 
Centaury, Yellow (Chlora perfoliata)—See Chlora. 
Centradenia.—Ord. Melastomacew. Stove flowering shrubs. 
Evergreen. First introduced 1840. : 
CULTURE: Compost, two parts peat, one part loam & sand. Posi- 
tion, sunny. Pot, Feb. Temp., Sept. to March 55° to 65°; March to 
Sept. 65° to 75°. Water moderately Sept. to March, freely afterwards. 
Propagate by cuttings of side shoots 2 or 3in. long inserted in pots of 
san x Bt under bell-glass in slate 85° in Feb. & March. ; 
SPECIES CULTIVATED: O. floribunda, red, July, 18 in., Mexico; grandiflora, 
a Sept., 18 in., Mexico; inequalateralis (Syn. C. rosea), rose, April, 1 ft., 
@x1C0. 
Centranthus (Red Valerian; Spur Valerian; German Lilac).— 
Ord, Valerianacew. Hardy herbaceous perennials & annuals. 
CULTURE: Soil, ordinary. Position, old walls, sunny rockeries, 
borders. Plant, March or April. Propagate by seeds sown 4 in. deep 
in light soil in temp. 55° in March, transplanting seedlings outdoors 
in May; or in sunny positions outdoors in April or June, transplanting 
seedlings in May or Aug.; perennials also by division in autumn or 
epring. 
ANNUAL SPECIES: C. macrosiphon, red, July, 2 ft., Spain; macrosiphon albus, 
white. 
PERENNIAL SPECIES: ©. ruber (Red Valerian), red, July, 18 in., Europe 
(Britain); ruber albus, white. 
EOE SPOS Vac On Campanulacee. Stove herbaceous peren- 
nial. 
CULTURE: Compost, equal parts loam, peat, leaf-mould, & a little 
sand. Pot, March. Position, stove Sept. to June; June to Sept. sunny 
frame outdoors. Temp., Oct. to Feb. 50° to 55°; Feb. to June 60° to 
75°. Water moderate y Sept. to Feb., freely afterwards. Prune shoots 
close to soil in Feb. when repotting. Propagate by cuttings of young 
shoots 3in. long, removed with a portion of stem attached, & inserted 
in light sandy soil in well-drained pots under bell-glass in temp. 60° 
0 70°. 
SPECIES CULTIVATED: OC. lucyanus, rose, autumn, 2 ft., a hybrid. Habitat 
of the genus: Trop. America. 
Centrosema.—Ord. Leguminose. Stove evergreen climbers. 
CULTURE: Compost, equal parts peat, loam, leaf-mould, & silver 
sand. Position, pots on staging, shoots trained up rafters or round a 
trellis or sticks. Pot in March. Water freely in spring & summer; 
moderately in winter. Temp., March to Sept. 75° to 85°; Sept. to 
March 55° to 65°. Propagate by seeds in a temp. of 75° in March; 
also by cuttings in sand in a temp. of 85° in summer. 
SPECIES CULTIVATED: O. Plumieri (Syn. Clitoria Plumieri), red and white, 
autumn, 6 ft., S. America, 
Century Plant (Agave americana).—See Agave. 
Cephalanthera (White Helleborine). — Ord. Orchidacee. 
Hardy terrestrial orchids. 
CULTURE: Soil, chalky loam. Position, open & well-drained border. 
Plant, Sept. & Oct. Pepeeaty by division of roots in Sept. 
SPEOIES OULTIVATED: O. ensifolia, white, June, 2 ft.; pallons Syn. O. grandi 
Sore), wire and yellow, June, 18 in.; rubra, purple and white, May, 18 in. Natives 
Cephalanthus (Button bush).—Ord. Rubiaces. Hardy deci- 
duous shrub. Orn. foliage. First introduced 1735, 
CULTURE: Soil, sand ee Position, open shrubberies. Plant, 
Oct. or Nov. Propagate by layers of shoots in Sept. or Oct. 
SPECIES CULTIVATED: O. occidentalis, white, July, 7 ft., N. America. 
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