560 



ERICACEAE. 



[VOL. II. 



Azalea viscosa glauca Michx. Fl. Bor. Am. i: 151. 1803. 

 Leaves white -glaucous beneath, i'-a' long, shrub i-6 high. Massachusetts to Virginia. 



Azalea viscosa nitida (Pursh) Britton, Mem. Torr. Club, 5: 248. 1894. 

 Azalea nitida Pursh, Fl. Am. Sept. 153. 1814. 



Leaves about i' long, bright green on both sides; low shrub. Massachusetts to Virginia. 



3. RHODORA L. Sp. PI. 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-lippcd, 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 monotypic genus of northeastern North America. 



i. Rhodora Canadensis L. Rhodora. 

 (Fig. 2748.) 



Rhodora Canadensis L. Sp. PI. 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, i-3 high, the branches slender, as- 

 cending or erect, the twigs sparingly strigose. 

 Leaves oval, obtuse and imicronulate 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, j'-a' long, 3"-7" wide; flowers ex- 

 panding with or before the leaves; pedicels very 

 short, stiff, hairy; corolla \'-i%' 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. PI. 392. 1753. 



Branching shrubs, with alternate persistent coriaceous leaves. Flowers large, or middle- 

 si/.ed, 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 5-2o-lobed; ovules numerous. Capsule short or elongated, mostly woody, 

 septicidally dehiscent, 5-20 valved from the summit. Seeds numerous. [Greek, rose-tree.] 



About loo 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'-i2' high; leaves small, lepidote. i. 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. Cataivbiense. 



i. Rhododendron Lapponicum (L/.) Wahl. 

 Lapland Rose Bay. (Fig. 2749.) 



Azalea Lapponica L. Sp. PI. 151. *753- 

 Rhododendron Lapponicinn Wahl. !"!. Suec. 249. 1824. 



Low, depressed or prostrate, branched, 2 / -i2 / 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 // -o/' 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. 



