Encyclopaedia of Gardening 273 



with white flowers in early summer, followed by red berries, which 

 hang a long time if the plants are kept in a cool, airy structure. 

 Loam, with sand and a little leaf mould, suits them. Propagation 

 is by seeds in heat in spring, and by cuttings. See the Botanical 

 Magazine, t. 1781. 



Robinia, Locust Tree (robin-ia, after M. Robin. Ord. Legumi- 

 noseae). Handsome hardy trees and shrubs, with pretty pinnate 

 leaves and Pea-like flowers in bunches. Hispida, the Rose Acacia, 

 is a beautiful tree 5 to 6 ft. high, with rosy flowers in spring (see the 

 Botanical Magazine, t. 311); and inermis which is a spineless 

 variety of it, is still better. Neo-mexicana makes a handsome tree 

 15 to 30 ft. high, with rosy flowers in autumn. Pseudacacia, the 

 False or Bastard Acacia, is the common Locust; it has white flowers 

 in spring, and is a good street tree ; angustifolia, aurea, Bessoniana, 

 and robusta Vignei are varieties of it. The Robinias thrive in most 

 soils, if not stiff and damp. Propagation is by seeds and grafting, 

 but is best done in the nurseries. 



Rochea (ro-chea, after M. La Roche. Ord. Crassulaceae). 

 Handsome evergreen succulents, allied to Crassulas, and grown in 

 the same way. Coccinea, i ft. high, with scarlet flowers in summer; 

 falcata (syn. Crassula falcata); and jasminea, 9 ins., with white 

 flowers in spring, are the principal species. 



Rock Broom. See Genista. 

 Rockery. See Flower Garden. 

 Rocket. See Hesperis. 

 Rocket Candytuft, Iberis coronaria. 

 Rock Jasmine. See Androsace. 

 Rock Rose. See Cistus. 



Rodgersia (rodger-sia, after Admiral Rodgers. Ord. Saxifrageae) . 

 A small genus of hardy herbaceous plants, only one of which, 

 podophylla, which grows 2 to 3 ft. high, and has small yellowish 

 flowers in summer, is grown to any extent. It forms fleshy under- 

 ground stems. It likes a moist, peaty spot. Propagation is by 

 division in spring. See the Botanical Magazine, t. 6691. 



Roller. A roller is almost indispensable in a garden where there 

 are gravel paths and turf. Both benefit greatly by its use after 

 rain. Water-ballast rollers have come into use, but are not superior, 

 An i8-in. roller will suffice for small gardens. 



Romneya Coulteri, Tree Poppy (rom-neya, after Dr. Romney 

 Robinson. Ord. Papaveraceae). A beautiful small Calif ornian 

 tree, growing 3 to 6 ft. high, and with large white flowers in summer. 

 It likes a well -drained loamy soil and a sheltered spot where it 

 will not be worried by strong winds. Propagation is by seeds sown 

 in a greenhouse or heated frame in spring. R. trichocalyx is very 

 similar to Coulteri. 



Rondeletia (rondel e-tia, after M. Rondelet. Ord. Rubiaceae). 

 A small genus of hothouse evergreens, only one of which, odorata 



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