560 ERICACEAE. [Vor. II. 
Azalea viscosa glaica Michx. Fl. Bor. Am, 1: 151. 1803. aA! 
Leaves white-glaucous beneath, 1'-2’ long, shrub 1°-6° high. Massachusetts to Virginia. 
Azalea viscosa nitida (Pursh) Britton, Mem. Torr. Club, 5: 248. 1894. 
Azalea nitlida Pursh, Fl. Am. Sept. 153. 1814. | ahem 
Leaves about 1’ long, bright green on both sides; low shrub. Massachusetts to Virginia. 
x 
3. RHODORA IL. Sp. Pl. Ed. 2, 561. 1762. 
A branching shrub, with deciduous oval or oblong short-petioled alternate leaves. Flow- 
ers, umbellate or short-corymbose, short-pedicelled, rose-colored, purple, or nearly white, from 
terminal scaly buds. Calyx minute. Corolla 2-lipped, the upper lip unequally 2-3-lobed, the 
lower divided to the base, the segments recurved. Stamens 10, about equalling the corolla; 
anthers awnless, attached by their backs to the filaments, Ovary 5-celled; ovules numer- 
ous in the cavities; style slender, slightly exserted; stigma capitate. Capsule linear-oblong, 
5-celled, septicidally 5-valved from the summit, many-seeded. [From the Greek, rhodon, 
a rose. 
A San genus of northeastern North America. 
1. Rhodora Canadénsis lL, Rhodora. 
(Fig. 2748.) 
Rhodora Canadensis I,. Sp. Pl. Ed. 2, 561. _ 1762. 
Rhododendron Rhodora Don, Gen. Syst. 3:848. 1834. 
Rhododendron Canadense B.S.P. Prel. Cat. N. Y. 33. 
1888. 
A shrub, 1°-3° high, the branches slender, as- 
cending or erect, the twigs sparingly strigose. 
Leaves oval, obtuse and mucronulate at the apex, 
narrowed at the base, entire, dark green and gla- 
brous, or nearly so, above, light green or pale and 
glaucous and slightly pubescent, at least on the 
veins beneath, 1/—2’ long, 3/’-7’’ wide; flowers ex- 
panding with or before the leaves; pedicels very 
short, stiff, hairy; corolla 17-114’ broad; lower lip 
divided into two linear-oblong obtuse segments; 
capsule oblong, puberulent, glaucous, 5/’-7’” high. 
In bogs and on wet hillsides, Newfoundland to New 
Jersey, west to Quebec, central New York and Penn- 
sylvania. May. 
4. RHODODENDRON L. Sp. Pl. 392. 1753. 
Branching shrubs, with alternate persistent coriaceous leaves. Flowers large, or middle- 
sized, purple, rose-colored or white, corymbose or umbellate, from scaly cone-like buds. 
Calyx small, or minute, 5-lobed or 5-parted. Corolla campanulate, 5-lobed, nearly regular. 
Stamens 5-10 (usually 10), little exserted, declined or equally spreading. Anthers awnless, 
attached by their backs to the filaments, the sacs opening by terminal pores. Style slender; 
stigma capitate or 5-20-lobed; ovules numerous. Capsule short or elongated, mostly woody, 
septicidally dehiscent, 5-20 valved from the summit. Seeds numerous. [Greek, rose-tree. ] 
About 100 species, natives of the northern hemisphere, most abundant in Asia. Besides the 
following some 5 others occur in the southern and western parts of North America. 
Arctic-alpine shrub, 4’-12' high; leaves small, lepidote. 1. R. Lapponicum. 
Tall shrubs or low trees; leaves large, glabrous. 
Leaves usually acute at both ends; calyx-lobes oblong, obtuse. 2. R. maximum. 
Leaves mostly obtuse at both ends; calyx-lobes short, acute. 3. R. Catawbiense. 
1. Rhododendron Lappénicum (L.) Wahl. 
Lapland Rose Bay. (Fig. 2749.) 
Azalea Lapponica L. Sp. Pl. 151. 1753. 
Rhododendron Lapponicum Wahl. Fl. Suec. 249. 1824. 
Low, depressed or prostrate, branched, 2/-12’ high. 
Leaves oval, elliptic or oblong, obtuse and mucronulate 
at the apex, narrowed or rounded at the base, 4’’-9’’ long, 
2//-4’’ wide, densely covered with brownish scales on 
both sides, short-petioled; flowers few in the umbels, on 
short pedicels with scurfy scales; calyx-lobes oblong, 
obtuse, pubescent; corolla purple, 5-lobed, 7’’-9’’ broad, 
the lobes oblong, obtuse; capsule ovoid-oblong, 2’/-3/” 
high. 
Summits of the higher mountains of New England and the 
Adirondacks of New York; Quebec and Labrador to Green- 
land, west through arctic America to Alaska. Also in north- 
ern Europe and Asia. Summer. 
