298 



PB ACTIO AL GUIDE TO GARDEN PLANTS 



CITRUS 



grantisswna, S. Foremani, 8. macro- 

 phylla, 8. intermed/ia and 8. oblata ovata. 

 Culture do. as above. 



S. Laureola (Laureola fragrans). — A 

 somewhat ornamental Himalayan shrub 

 with a rather strong if not actually dis- 

 agreeable odour, by which it may be 

 readily distinguished from its more popular 

 relatives. It grows 3-4 ft. high, and has 

 deep green oblong lance-shaped leaves, 

 3-5 in. long, narrowed at each end and 

 yellowish-green beneath. The pale yellow 

 strongly scented flowers appear in spring, 

 and are replaced in autumn by smooth 

 ovoid berries resembling the fruits of the 

 Olive. 



Culture do. as above. This species is 

 not very much grovra, and is not nearly 

 so hardy as the other kinds mentioned. 

 It is fairly hardy in the Thames Valley, but 

 in more northern parts would probably 

 require protection in severe winters. 



S. Rogfersi. — This is probably a hybrid 

 between 8. Portunei and 8. japonica. It 

 has greenish or dull purple shoots fur- 

 nished with more or less lance-shaped 

 leaves 3 in. or so in length, with margins 

 slightly recurved. The flowers are usually 

 hermaphrodite as in 8. Fortunei and are 

 succeeded by large deep crimson berries 

 in autumn. 



Culture dc. as above. 



CITRUS (Orange). — A genus of trees 

 or shrubs often spiny, with alternate 

 dotted leaves, having a winged stalk 

 jointed with the blade. Flowers herm- 

 aphrodite, very fragrant. Calyx cup- 

 shaped or urn-shaped, 3-5-oleft. Petals 

 4-8, linear oblong, thick, imbricate. 

 Stamens 20-60, variously united, or in 

 many bundles. Disc large, cup-shaped, 

 ringed; style smooth, deciduous, with a 



capitate, lobed stigma. Fruit a globose 

 or oblong, fleshy, manv-celled berry, with 

 a rind, of which the Orange and Citron are 

 good examples. 



Culture and Propagation. — The 

 species of Orange mentioned below are the 

 only ones which can be grown out of 

 doors in this country in the mUdest parts, 

 and even they require protection in 

 severe winters. They are worth growing 

 for their appearance — glossy green leaves 

 with a profusion of white-scented flowers 

 and sometimes many fruits. They wiU 

 flourish in good garden soU, and are best 

 sheltered from the cold winds from the 

 north and east. Fresh plants may be 

 obtained by means of seeds sown as soon 

 as ripe in gentle heat. Cuttings of the 

 plump and firm young shoots may also be 

 inserted in sandy soil in gentle heatmider 

 a bell-glass until rooted. The branches 

 may also be layered out of doors in autumn 

 and budding and grafting may be per- 

 formed on stocks raised from seed. 



C. japonica [Kumguat). — A shrub 

 4-6 ft. high, native of China and Japan, 

 with bright yellow fruit. It requires 

 plenty of water in summer, but should be 

 kept dry in winter. It is frequently 

 grafted on C. trifoUata. 



Culture dc. as above. 



C. trifoliata (Pseudcegle sepiaria). — 

 A Japanese shrub 4 ft. high, with trifoUo- 

 late leaves, fragrant white flowers pro- 

 duced in April and May, and orange-yellow 

 fruits about 1^ in. in diameter. 



Culture da. as above. In the neigh- 

 bourhood of London this species has 

 proved to be perfectly hardy in ordinary 

 winters in open unprotected situations. 

 The flowers appear before the leaves, the 

 latter not attaining their full size until 

 about the end of June. 



XXX. SIMARUBEiE— Tree of Heaven Order 



A natural order containing over 100 species of scentless shrubs or trees, often 

 tall, sometimes herbs, vyith more or less bitter bark. Leaves alternate, or 

 rarely opposite, pinnate, rarely 1-3-foliolate or simple, leaflets without spots, 

 rarely glandular. Stipules none. Inflorescence usually axillary, panicled or 

 racemose, rarely spicate, or a solitary flower. Flowers diclinous or poly- 

 gamous, rarely hermaphrodite, regular, usually small. Calyx 3-5-lobed or 

 parted. Petals 3-5, very rarely absent, imbricate or valvate. Disc rarely 

 absent, ringed, cup-shaped or elongated into a gynophore, entire or lobed. 



