40 ERICACEiE. Rhododendron. 



R. Kamtschaticum, Pall. A span high : leaves thin and chartaceo-membranaeeous, 

 sessile, obovate, or the upper oval, very obtuse, nervose-veined and reticulated, bristly 

 ciliate, shining : sepals large and f oliaceous, deciduous : corolla rose-purple, deeply 5-cleft 

 nearly an inch long : capsule thin. — Fl. Ross. i. 48, t. 33 ; Hook. Fl. ii. 43. Rhodothamms 

 Kamtschalicus, Lindl. in Paxt. Fl. Gard. i. t. 22. — Alaska and Aleutian Islands to North 

 Japan, &c. 



§ 2. Azaleastrum, Planchon, Maxim. Inflorescence lateral ; the flowers 

 •from the same bud as the leafy shoot or from separate 1-3-flowered lateral buds 

 below : scales caducous : leaves deciduous : corolla rotate or approaching cam- 

 panulate : stamens 5 to 10. 



R. albiflorum, Hook. Shrub 2 or 3 feet high, with slender branches, pubescent with 

 slender strigose or silky and some short glandular hairs when young, nearly glabrous 

 in age : leaves membranaceous, oblong, pale green : flowers from separate small buds of 

 the axils of the previous year, nodding on short pedicels : sepals membranaceo-f oliaceous, 

 oval or oblong, half the length of the white 5-cleft corolla, as long as the ovoid capsule : 

 stamens 10, included: filaments bearded at the base: stigma peltate-5-lobed. — Fl. ii. 43, 

 t. 133, & Bot. Mag. t. 3670. — "Woods of the northern Rocky Mountains and Oregon to 

 British Columbia. Corolla less than an inch long. 



§ 3. Azalea, Planchon, Maxim. Inflorescence terminal ; with the umbellate 

 flowers from a separate strobilaceous bud, terminating the growth of the previous 

 year, surrounded at' the base by lateral and smaller leaf-buds, developing in 

 spring or early summer ; the thin-scaly bud-scales and bracts caducous or early 

 deciduous : leaves deciduous, glandular-mucronate : calyx small, sometimes minute : 

 corolla chiefly funnelform, glandular- viscid outside: stamens (5 to 10) and style 

 more or less exserted and declined. — Azalea, L. chiefly, DC. &c. (with Hhodbra, 

 Duhamel). 



* Strobilaceous flower-buds of numerous much imbricated scales : corolla with conspicuous funnel- 

 form tube, slightly irregular limb, and acute oblong lobes: stamens (chiefly 5) and style long- 

 exserted. Tkue Azaleas. 



*■— Pacific States species : flowers more or less later than the. leaves. 

 R. OCCidentale, Gray. Shrub 2 to 6 feet high : branches not bristly : leaves obovate- 

 oblong, nearly glabrous at maturity, but ciliate, thickish, bright green and shining above 

 (1 to 3 inches long) : lobes of the 5-parted calyx oblong or oval : corolla white or barely 

 with a rosy tinge and a pale yellow band on the upper lobe, often 2^ inches long ; capsule 

 oblong, three-fourths inch long. — Bot. Calif, i. 458. R. calendulaceum, Hook. & Arn. Beech. 

 362. Azalea occidentalis, Torr. & Gray, Pacif. R. Rep. iv. 116. — California, western foot- 

 hills of the Sierra Nevada through the length of the State, and in the coast ranges, along 

 streams. Fragrance of blossoms sweet, but slightly unpleasant. 



•i— -K- Atlantic States species (commonly called Swamp Honeysuckles), all from 3 to 10 feet 

 high and the leaves from obovate to oblong-oblanceolate. — Species of' Rhododendron, Torr. Fl. 

 N. &M. States (1824). 424. 



-H- Flowers appearing later than the glabrous leaves, deliciously fragrant. 

 R. arborescens, Torr. Few strigose or chaffy bristles : leaves (fragrant in drying) 

 merely ciliolate, slightly coriaceous when mature, bright green and shining above, glau- 

 cesceut beneath : corolla white or tinged with rose, fully 2 inches long ; the tube and the 

 conspicuous narrow-oblong calyx-lobes sparsely glandular-bristly : stamens and style red. — 

 Fl, N. & M. States, 425. Azalea arborescens, Pursh, Fl. i. 152; Gray, Man. ed. 1, 268. 

 A. fragrans, Raf. Ann. Nat. 12. — Alleghany Mountains, Pennsylvania to North Carolina. 

 Foliage exhales the odor of Anthoxanthvjn in drying. 

 R. viscosum, Torr. Branchlets and midrib of the leaves beneath more or less chaffy- 

 bristly : leaves more ciliate, an inch or two long, dull or hardly shining above, pale be- 

 neath : calyx very small : corolla white, or with a rosy tinge, sometimes varying to reddish, 

 the outside very glandular-viscid. — Fl. N. & M. States, 1. c, & Fl. N. Y. i. 439, t. 66. 

 Azalea viscosa, L. (Catesb. Car. i. t. 57)"; Miclix. Fl. i. 150 ; Emerson, Mass. Rep. ed. 2, 



