RETIKOS- 

 PORAS BY CUTTINGS IN 

 AUTUMN. 



Base. 2. Side -shoots 

 removed. 3. Depth of 

 insertion. 



Encyclopaedia of Gardening 27 1 



Rest Harrow. See Ononis. 



Retinospora or Retinispora (retinos-pora, from vetine, resin, and 

 sporos, seed. Ord. Coniferae). Handsome small Conifers, resem- 

 bling Cupressus, and amenable to the same 

 culture, in fact they are classed with the 

 Cypresses by modern botanists. Erecta, 

 ericoides, filifera, leptoclada, lycopodioides, 

 obtusa, o. densa aurea, o. alba spica, pisi- 

 fera, p. aurea, plumosa, p. aurea, p. argentea, 

 squarrosa, and other species and varieties 

 are offered by nurserymen under the name 

 of Retinospora. Propagate by cuttings. 



Rhamnus, Buckthorn (rham-nus, from the 

 Celtic rham. Ord. Rhamneae). A large 

 genus, of which only a few species and varie- 

 ties need be considered. Alaternus, which 

 grows 15 to 20 ft. high, and has green flowers 

 in spring, is the best known; angustifolius, 

 a. variegatus and aureus are varieties, of it. p 

 Catharticus, 6 to 8 ft., has green flowers in 

 summer, followed by black fruit. Frangula 

 (syn. latifolius), the Black Dogwood, also i. 

 has black fruit. Libanoticus colours well in 

 autumn. They are all hardy, and not 

 particular as to soil. Propagation is by seed and layers. 



Rhapis (rha-pis, from rhapis, a needle. Ord. Palmae). Flabelli- 

 f ormis is a useful fan-leaved palm, suitable for rooms and corridors ; 

 there is a variegated-leaved variety. For culture, see Palms. 



Rheum, Rhubarb (rhe-um, from Rha, the river near which the 

 plant was found. Ord. Polygonaceae) . Some of the Rheums are 

 useful for prominent positions in the wild garden, as the leaves are 

 broad and massive. Palmatum and its variety purpureum are 

 particularly good. They are hardy, and thrive in ordinary soil. 

 Propagation is by division in spring. Rhaponticum is the common 

 Rhubarb. See Kitchen Garden. 



Rhipsalis, Mistletoe Cactus (rhip-salis, from rhips, a Willow 

 branch, on account of the flexibility. Ord. Cacteae). See Cactus. 



Rhodanthe (rhodan-the, from rhodon, a rose, and anthos, a flower. 

 Ord. Compositae). Pretty half-hardy annual everlastings. Man- 

 glesi, with rosy flowers in summer, grows about a foot high. 

 Botanists now call it Helipterum Manglesii. For culture, see 

 Annuals Half-hardy. 



Rhodochiton volubile (rhodochi-ton, from rhodo, red, and chiton, 

 a cloak, in allusion to the calyx. Ord. Scrophularineae) . A hand- 

 some greenhouse climber, with red flowers in early summer (syn. 

 Lophospermum) . Loam, with sand and a third of leaf soil, suits 

 it. Propagation is by seeds in a greenhouse in spring, or by cuttings 

 in sandy soil under a bell-glass in August (see the Botanical Magazine, 

 t- 3367). 



