6So 



ERICACEAE. 



Vol. II. 



I. Rhodora canadensis L. Rhodora. Fig. 3220. 



Rhodora canadensis L. Sp. PI. Ed. 2, 561. 1762. 



Rhododendron Rhodora Gmel. Syst. 694. 1791. 



Rhododendron canadense B.S.P. Prel. Cat. N. Y. 33. 

 ■ 1888. 



A shrub, l°-3° high, the branches slender, ascend- 

 ing or erect, the twigs sparingly strigose. Leaves 

 oval or oblong, 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, I'-z' long, 2"-y" wide ; flowers expanding 

 with or before the leaves; pedicels very short, stiff, 

 hairy; corolla about i' broad; lower lip divided into 

 two linear-oblong obtuse segments; capsule oblong, 

 puberulent, glaucous, s"-y" high. 



In bogs and on wet hillsides, Newfoundland to New 

 Jersey, west to Quebec, central New York and Pennsyl- 

 vania, Lamb-kill. May. 



4. RHODODENDRON L. Sp. PI. 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, S-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, s-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 southern and western North America. Type species: Rhododen- 

 dron ferrugineum L. 



Arctic-alpine shrub, 4^-12' high ; leaves small, lepidote. 

 Tall shrubs or low trees ; leaves large, glabrous. 



Leaves usually acute at both ends ; calyx-lobes oblong, obtuse. 



Leaves mostlv obtuse at both ends ; calyx-lobes short, acute. 



1, R. lapponicum. 



2, R. maximum. 



3, R, catawbiense. 



I. Rhododendron lapponicum (L.) Wahl. Lapland Rose Bay. Fig. 3221. 



Azalea lapponica L. Sp. PI. 151. 1753. 



Rhododendron lapponicum Wahl. Fl. 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"-g" broad, the lobes 

 oblong, obtuse; stamens S or 10; capsule ovoid-oblong, 

 2"-3" high. 



Summits of the higher miountains of New England and the 

 Adirondacks of New York ; Quebec and Labrador to Greenland, 

 west through arctic America to Alaska. Also in northern Eu- 

 rope and Asia. Laurel. Summer. 



