433 ERICACEAE azalea 



RHODODENDRON 



and large flowers in terminal umbels developed from scaly buds 

 that terminate the growth of the previous year and surrounded at 

 the base by lateral and smaller leaf-buds. Bud-scales and bracts 

 caducous or early deciduous. Calyx small or minute, 5-parted. 

 Corolla funnelform, glandular-viscid outside, with narrow tube 

 and 5-lobed, often more or less 2-lipped limb. Stamens 5, rarely 

 10, exserted, usually declined : anthers attached to the filaments 

 by their backs, the cells opening by terminal pores. Style slen- 

 der, declined exserted. Ovary 5-celled, many-ovuled. Capsule 

 oblong or narrower, 5-valved from the summit. Seeds minute, 

 with a loose chaff-like coat. 



A. occidentalis T. & G. Pacif. R. Rep. iv, 116. Rhododendron occi- 

 dentalis Gray. Stems erect, 3-10 feet high, much branched: leaves ob- 

 ovate-oblong, nearly or quite glabrous at maturity but minutely ciliate, 

 bright green and shining above, paler beneath, 1-3 inches long, tapering 

 below to a short petiole, tipped with a short red gland : calyx 5-lobed, the 

 oblong or ovate lobes glandular and ciliate, about a line long, corolla 

 cream-white with orange stripes, 2 inches long, with conspicuous funnel- 

 form tube, slightly irregular limb and acute lobes, glandular--viscid out- 

 side : stamens 5, exserted and declined : filaments hairy below ; style long- 

 exserted, curved upward; capsule oblong, 8-13 lines long. About springs 

 and along streams, southwestern Oregon and California. 



12 RHODODENDRON L. Gen. n. 548. 



Shrubs or small trees with alternate evergreen coriaceous leaves 

 and mostly large showy white to rose-colored or purple flowers in 

 terminal umbels or corymbs from scaly buds, the thin scales de- 

 ciduous when the flowers open. Calyx small or minute, 5-lobed 

 or 5-parted, persistent. Corolla campanulate, 5-lobed, nearly reg- 

 ular. Stamens usually 10, little exserted declined or equally 

 spreading : anthers erect, attached by their backs, the cells open- 

 ing by terminal pores. Capsule short or elongated, mostly woody, 

 5-80-valved from the summit. Seeds very numerous and small, 

 with a loose chaff-like coat. 



R. Califomicum Hook. Bot. Mag. t. 4863. Stems 3-12 feet high, 

 with stout erect branches, glabrous : leaves broadly oblong. 3-6 inches 

 long, dark green and shining above: flowers very numerous in the fasci- 

 cles : calyx minute, slightly .'i-lobed : corollas large and showy, rose-color, 

 a little irregular, broadly campanulate more than an inch in diameter, the 

 5 broad lobes undulate: stamens 10, not exserted, ovary rusty-hirsute: 

 capsule 10-18 lines long. On mountains and along the coast, California 

 to Brit. Columbia. 



B. macrophyllum Don Syst. iii, 843. "Shrub 10 to 15 feet high: 

 leaves oblong, acute at both ends, 5 to 8 inches in length, thinnish : corolla 

 white, less than an inch long: its lobes oblong: ovary bristly hirsute. 

 Woods, Puget Sound, Washington, to Brit. Columbia." 



■^ ■>- *- Corolla polypetalous or very nearly so. Filaments fili- 

 form. Placentae borne on the summit of the persistent columella. 

 Seed scobiform or linear. 



