40 ERICACEAE. llhudodendron. 



R. Karatschaticum, Pall. A span high : leaves thin and chartaceo-membranaceous, 

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

 ciliatc, shining : sepals large and foliaceous, deciduous : corolla rose-purple, deeply 5-clef t, 

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

 Kamtsc/iaticus, Lindl. in Paxt. Fl. Gard. i. t. 22. — Alaska and Aleutian Islands to JS^orth 

 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 aijproachiug 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 glandidar hairs when young, nearly glabrous 

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

 the axils of the previous year, nodding on short pedicels : sepals menibranaceo-foliaceous, 

 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, 

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

 Columbia. Corolla less than an inch long. 



§ 3. AzXlea, 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 and style more or 

 less exserted and declined (5 to 10). — Azalea, L. chiefly, DC. &c. (with Rhodura, 

 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. Thue 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, of ten 2^ inches long ; ca])sule 

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

 362. Azalea occidental is, Ton- . & Gray, Pacif. K. 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. 



j^ J^^ Atlantic States species (commonly called Swamp Hoxeysuckles), all from 3 to 10 feet 

 \ivj\\ and the leaves from obovate to oblong-oblanceolate. — Species of R liodudendrun, Torr. Fl. 

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



++ Flowers appearing later than the glabrous leaves, deliciously fragrant. 



R. arborescens, Torr. No strigose or chaffy bristles : leaves (fragrant in drying) 

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

 cescent beneath : corolla rose-color, fully 2 inches long ; the tube and the conspicuous 

 narrow-oblong calyx-lobes sparsely glandular-bristly. — Fl. N. & M. States, 425. Azaha 

 cuiiorescens, Pursh, Fl. i. 152; Gray, Man. ed. 1, 2(38. ^. //w/m/(s, Raf. Atm. Nat. 12. — 

 Alleghany Mountains, Pennsylvania to North Carolina. Foliage exhales the odor of Ah- 

 diu.niiit/iiiiit in drying. 



R. viscosum, Torr. Branchlets and niidrib 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, I.e., & Fl. N. Y. i. 430, t. 06. 

 Azalea vtscusa, L. (Catesb. Car. i. t. 57) ; Michx. Fl. i. 150; Emerson, Mass. Rep. ed. 2, 



