ERICACEAE (HEATH FAMILY) 631 



Var. dilatatum Wahlenb. Leaves broader, linear-ohlong, 1-4 cm. long. — 

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

 northw. (Eurasia.) 



9. RHODODENDRON L. 



Calyx mostly small or minute. Stamens sometimes as few as the corolla- 

 lobes, more commonly twice as many, usually declined ; auther-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, a.nd large and showy flowers in unibeled clusters from 

 terminal buds. ('Po868€p8pov, rose-tree; the ancient name.) 



§ 1. AZAlEA (L.) Planch. Leaves deciduous, glandular-mucronate; 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 lo ng -exserted ; 0.6-6 m. 

 high., with leaves obovate to oblong-oblanceolate. 



-t- Flowers appearing after the leaves. 



1. R. arborescens (Pursh) 'J'orr. (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. R. viscbsum (L.) Torr. (C'lammy Azalea, White Sw^\mp Honey- 

 SLCKLE.) 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 O., Ark , and southw. June, July. Var. glaucum (Michx.) Gray. 

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

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

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



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



3. R. nudifl5rum (L.) Torr. (Purple A., Pinxter Flower.) 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., 1.5-8 cm. long. {Azalea L.) — Open woods 

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

 {Gleason.) May, June. 



4. R. canescens (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 i?. luteum Sweet.) — Woods, s. X. 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 fevmr 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. canadense (L.) BSP. (Khodora.) 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). 



