320 ERICACEAE. (HEATH FAMILY.) 



1. M. glab611a, Gray. Strigose-chaffy scales mostly wanting; leaves 

 obovate, barely mucronate-tipped, ylabrous or nearly so (1 -2' long) ; filaments 

 dilate below; capsule ylabrous or nearly so; seeds long-caudate at each end. 

 Minnesota Point, L. Superior, and northwestward. 



2. M. globularis, Salisb. More or less chaffy, 2-5 high ; leaves obo- 

 vate-oblong, prominently glandular-mucronate, striyose-hirsute especially above : 

 Jilaments glabrous ; capsule beset with short gland-tipped bristles; seeds mere/i/ 

 aplculate. (M. ferrugiuea, var. globularis, of Manual.) In the Alleghauies 

 from Penn. to Ga. 



16. RHODODENDRON, L. ROSE BAY, AZALEA, etc. 



Flowers almost always 5-merous. Calyx mostly small or minute. Corolla 

 various (but not contracted at the orifice), lobed or cleft, or even parted, often 

 somewhat irregular. Stamens sometimes as few as the corolla-lobes, more 

 commonly twice as many, usually declined ; anther-cells opening by a round 

 terminal pore. Capsule 5-celled, 5-valved, many-seeded. Seeds scale-like. 

 Shrubs or small trees, of diverse habit and character, with chiefly alternate 

 entire leaves, and large and showy flowers in umbelled clusters from large 

 scaly-bracted terminal buds. ('PoSoSevSpov, rose-tree ; the ancient name.) 



1. AZALEA. Leaves deciduous, glandular-mucronate; stamens (5 to 10) 

 and style more or less exserted and declined. 



* Flower-buds of numerous much imbricated scales ; corolla with conspicuous 

 funnel-form tube; stamens (chiefly 5) and style long-exserted ; 3-10 high, 

 with leaves obovate to oblong -obi anceolate. 



-t- Flowers appearing after the leaves. 



1. R. arborescens, Torr. (SMOOTH AZALEA.) Branchlets smooth; 

 leaves obovate, obtuse, very smooth both sides, shining above, glaucous beneath, 

 the margins bristly-ciliate ; calyx-lobes long and conspicuous , corolla slightly 

 clammy. (Azalea arborescens, Pursh.) Mountains of Penn. to N. C. June. 

 Rose-colored flowers very fragrant. 



2. R. viscbsum, Torr. (CLAMMY A. WHITE SWAMP-HONEYSUCKLE.) 

 Branchlets bristly, as well as the margins and midrib of the oblong-obovate 

 otherwise smooth leaves ; calyx-lobes minute. ; corolla clammy, the tube much 

 longer than the lobes. (Azalea viscosa, L.) Swamps, mostly near the coast, 

 Canada and Maine, to Fla. and Ark. June, July. Var. GLAUCUM, Gray. 

 Leaves paler, often white-glaucous underneath or on both sides, sometimes 

 rough-hairy. N. Eng. to Va. Var. NITIDUM, Gray. Dwarf, with oblan- 

 ceolate leaves green both sides. Mountains, N. Y. to Va. 



<- -i- Flowers appearing before or with the leaves. 



3. R. nudifldrum, Torr. (PURPLE A. PINXTEK-FLOWER.) Leaves 

 downy underneath ; tube of the corolla scarcely longer than the ample lobes, 

 slightly glandular. (Azalea midiflora, L.) Swamps, Canada to Fla., 111., Mo., 

 and Tex. April, May. The showy flowers vary from flesh-color to pink and 

 purple. There are numberless varieties, some of them with 10 stamens. 



4. R. calendulaceum, Torr. (FLAME-COLORED AZALEA.) Leaves 

 hairy; tube of the corolla shorter than the lobes, hairy. (Azalea caleudulacea, 



