ERICACEAE (HEATH FAMILY) 681 



Var. dilatatum Walilenb. Leaves broader, linear-oblong, 1-4 cm. long. — 

 Nfd., e. Que., Mt. Katahdin, Me., and apparently on the Great Lakes, and 

 nortbw. (Eurasia.) 



9. RHODODENDRON L. 



Calyx mostly small or minute. 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-valYed, 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 umbeled clusters from 

 terminal buds. {'PoSidevSpov, rose-tree; the ancient name. ) 



§ I. AZAleA (L.) Planch. Leaves deciduous, glandular-mueronate; stamens 

 (5-10) 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 ; 0.6-6 m. 

 high, with leaves_ obovdte to oblong-oblanceolate. 



■*- Flowers appearing after the leaves. 



1. R. arbor^scens (Pursh) 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, rose-colored, fragrant. {Azalea Pursh.) — Mts. of Pa., southw. June. 

 \/' 2. H. viscbsum (L.) Torr. (Clammy Azalea, White Swamp Honey- 

 suckle.) 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 L.) — Swamps, mostly near the 

 coast. Me. to 0., Ark., and soutliw. June, July. Var.,GLAT}cuM (Michx.) Gray. 

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

 rough-hairy. — N. E. to Va. Var. ni'tidum (Pursh) Gray. Dwarf, with oblance- 

 olate leaves green both sides. — N. E. to Va. 



^- +- Flowers appearing before or with the leaves. 



^3. R. nudifldrum (L.) Torr. (Purple A., Pinxter Tlowek.) Leaves 

 oblanceolate to obovate, sparingly pubescent, or glabrate except on the ciliolate 

 margins. and strigose midrib (beneath); pedicels strigose-hairy ; corolla flesh- 

 color, pink or purple, the tube strigose or slightly glandular, scarcely longer than 

 ■ the ample lobes ; capsule strigose, 1.8-3 cm. long. (Azalea L.) — Open woods 

 and swamps, Mass. to Fla. and Tex. ; locally n. in Miss, basin to Union Co., 111. 

 (Qleason.) May, June. 



4. R. canfiscens (Michx.) G. Don. Similar ; leaves ovate, obovate, or ellip- 

 tic, softly pubescent beneath, especially when young ; pedicels, corolla-tube, and 

 capsule (1.2-1.8 cm. long) glandular. (Azalea Michx.) — Woods and gravelly 

 shores, N. H. to N. Y., and southw. May, June. — Sometimes too near the 

 preceding species. 



5. R. calendulaceum (Michx.) Torr. (Flame-colored A.) Leaves hairy; 

 tube of the corolla shorter than the lobes, hairy. (Azalea Michx.; A. lutea L., 

 not B. luteum "Sweet.) — Woods, s. N. Y. and mts. of Pa. to Ga. May. — Cov- 



. ered as the leaves appear with large orange blossoms, usually turning to flame- 

 color, not fragrant. 



* * Flower-buds of fewer and early caducous scales ; corolla irregular (usually 



earlier than the leaves), with short or hardly any tube, anteriorly divided to 

 the base ; the limb equaling the 10 stamens and style. 



6. R. canadSnse (L.) BSP. (Rhodora.) Shrub, 1 m. or less high; young 

 parts sparingly strigose-hairy ; leaves oblong, pale, more or less pubescent ; 

 corolla rarely 2 cm. long, purplish-rose-color (rarely white), bilabiate, with the 

 posterior lip 3-lobed, the anterior of 2 oblong-linear and recurving nearly or 

 quite distinct petals. (Bhodora L. ; Bhododendron Bhodora Gmel.) — Swamps 

 and damp slopes, Nfd. to w. Que., Pa. and N. J. May, June (rarely July). 



