320 JLRICACEiE. (heath FAMILY.) 



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



obovate, barely mucronate-tipped, ^/c;Aro?/s or nearly so (1 -2' long) ; Jilaments 

 ciliate below; capsule glabrous 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,s^?-/^ose-A»-swie especially above : 

 Jilaments glabrous; capsule beset with short gland-tipped bristles; seeds merelij 

 apiculate. (M. ferruginea, var. globularis, of Manual.) — In the Alleghanies 

 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. — 

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

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

 scaly-bracted terminal buds. {'PoSodevdpov, rose-tree ; the ancient name.) 



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



and stijle 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 anceol ate. 



■\- 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. visc6sum, Torr. (Clammy A. White Swamp-Hoxeysuckle.) 

 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. NfTiDUM, Gray. Dwarf, with oblan- 

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



■*- ^^- Flowers appearing before or icith the leaves. 



3. R. nudiflbrum, Torr. (Purple A. Pinxter-flower.) Leaves 

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

 slightly glandular. (Azalea nudiflora, 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. calendulkceum, Torr. (Flame-colored Azalea.) Leaves 

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



