Rhododendron.—Of the Rhododendrons the following are satisfactory: R. altaclerense, Anthopogon, arborescens, arboreum Campbelliæ, azaleoides, blandyanum, calendulaceum, campanulatum, campylocarpum, catawbiense, caucasicum,* ciliatum, cinnabarinum,* ferrugineum,* fulgens, glaucum,* hirsutum* and varieties, indicum balsaminæflorum, lancifolium, lepidotum,* myrtifolium,* nobleanum,* n. album,* ponticum* (many varieties), præcox,* punctatum, racemosum, Rhodora, sinensis* (Azalea mollis), Vaseyi,* Wilsoni. These are the principal Rhododendrons that thrive and flower well here. No other shrubs give such a long and varied flower display.
Ribes.—R. alpinum, aureum, and rubrum. R. sanguineum* and its varieties are the principal ornamental currants.
Robinia Pseudacacia.*—An elegant foliage tree, and usually the last to break into leaf.
Rosa.—Practically all the Tea and Hybrid Perpetual Roses can be grown, if sheltered spots are chosen and the plants grown as dwarfs. However, the stronger varieties are the most satisfactory ones, and in bad seasons it is July before they commence to flower, although September has well advanced before they cease. The hybrid Sweet Briars are the freest of all to grow. Groups form thickets of foliage which are almost hidden with blossom. Rosa wichuraiana covers banks, or anything somewhat flat, in a very short time. It flowers through September, and attracts great attention. Such tender Roses as Maréchal Niel, Niphetos, and Banksian are useless.
Rosmarinus officinalis (Rosemary).
Rubus.—Of these, R. arcticus, dwarf; R. lacinatus,* R. nutkanus.* R. deliciosus* is a beautiful shrub, and should be left alone after planting.
Ruscus (Butcher's Broom).—R. aculeatus and R. Hypoglossum.
Salix (Willow).—S. alba, babylonica (Babylonian Willow), and pendula, a lovely tree. S. Caprea* (Goat Willow), fragilis, herbacea (the Alpine Willow, not much larger than the Wild Thyme), Lapponum, nigra, Paulinæ, reticulata, rubra, viminalis.
Sambucus (Elder).—S. canadensis, nigra, racemosus.
Skimmia Fortunei and S. japonica.*