40 ERICACE^. Rhododendron. 



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

 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 6-clef t, 

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

 Kamtschaticus, 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- 

 pan ulate : 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 niembranaceo-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 Rhodora, 

 Duhamel). 



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

 form tube, sliglitly 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 higii : 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 wiiite 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. calendidaceum, Hook. & Am. Beech. 

 362. Azalea occidentahs, 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. 



^_ 4_- Atlantic States species (commonlv called Swamp Honeysuckles), all from 3 to 10 feet 

 high and the leaves from obovate to oblong-oblauceolate. — Species oi Rhododendron, Torr. Fl. 

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



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



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

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

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

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

 arborescens, Pursh, Fl. i. 152; Gray, Man. ed. 1, 268. A. frugrans,!^^^ Ann. Nat. 12. — 

 AUegliany Mountains, Pennsylvania to North Carolina. Foliage exhales the odor of An- 

 (lioxanl/ium in drying. 



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

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

 neatli : calyx very small : corolla white, or witii 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 mcosa, L. (Catesb. Car. i. t. 67) ; Michx. Fl. i. 150; Emerson, Mass. Rep. ed. 2, 



