Rhododendron. ERICACEAE. A\ 



t. 24. — Swamps, Canada and Maine to Florida and Arkansas. Runs into manifold vari- 

 eties ; the following being those most marked : — 



Var. glaucum. Leaves glaucous-whitened beneath, dull and sometimes glaucous 

 above also. — Azalea viseosa, var. glauca, Michx. 1. c. A. glauca, Lam. 111. t. 110. R. glau- 

 cum, Don, 1. c. Form more strigose-hispid is A. hispida, Pursh, 1. c. (R. hispidum, Torr. 1. c.) 

 A. scubra, Loddiges, &c. — New England to Virginia. 



Var. nitidum. Leaves oblanceolate, brighter green both sides : stems a foot to a 



yard high. — R. nitidum, Torr. 1. c. Azalea nitida, Pursh, 1. c. ; Lindl. Bot. Reg. t. 414. 



Mountains, New York to Virginia. 



■H- -H- Flowers earlier and less fragrant, preceding or accompanying the leaves ; these soft-pubes- 

 cent beneath and more membranaceous, 1 to 3 inches long; the midrib and the branchlets either 

 slightly or not at all chaffy-strigose or hispid : calyx usually very small. 



R. nudiflorum, Torr. 1. c. Corolla from light rose-color or flesh-color to rose-purple ; 

 the viscid tube as long as or rather longer than the limb. — Azalea nudiflora, L. Spec. 

 ed. 2, 214 ; Sims, Bot. Mag. 1. 180 ; Emerson, 1. c. t. 24. A. lutea, L. Spec. ed. 1. A. peri- 

 cli/menoides & A. canescens, Michx. 1. c. A. bicolor, Pursh, 1. c. Rhododendron canescens, bicolor, 

 &c, Don, 1. c. — Swamps, low grounds, or shaded hillsides, Canada to Florida and Texas. 

 Varying much in color, &c, at the south sometimes passing into yellow. Many hybrid 

 forms are in cultivation. 



B. calendulaeeum, Torr. 1. c. Corolla from orange-yellow to flame-red ; the tube 

 mostly hirsute-glandular, shorter than the ample limb : mature leaves more tomentose 

 beneath. — Azalea calendulacea, Michx. Fl. i. 151; Pursh, 1. c. ; Bot. Mag. 1. 1721, 2143. — 

 Woods in the Alleghany Mountains, from Pennsylvania to Georgia, extending southward 

 into the middle country. 



* # Strobilaceous flower-buds of fewer and early caducous scales : corolla irregular, with a short 



or hardlv any tube, anteriorly divided to the base; the limb equalling the 10 stamens and style. 

 — Rhvutora, Duhamel, in Linn. Gen. 



R. Rhodora, Don. A foot or two high, the young parts sparingly strigose-hairy : 

 flowers somewhat preceding the leaves, short-pedicelled : calyx very small : corolla less 

 than an inch long, purplish-rose-color, bilabiately parted or divided; the posterior lip 

 3-lobed; the anterior of two oblong-linear and recurving nearly or quite distinct petals: 

 leaves oblong, pale, glaucescent, more or less pubescent. — Syst. iii. 848 ; Maxim. 1. c. 

 Rhodora. Canadensis,.!,.; L'Her. Stirp. i. 161, t. 68; Lam. 111. t. 364;. Bot. Mag. t. 474; 

 Duham. Arb. ed. nov. iii. 53 ; Emerson, 1. c. t. 25. Rhodora congesta, Mcench. Rhodo- 

 dendron pulchellum, Salisb. — Cool bogs, New England to mountains of Pennsylvania and 

 northward to Newfoundland : fl. May. Mature leaves 1 to 2| inches long, glandular- 

 mucronulate. Flowers rarely white, sometimes variably or variously cleft or divided, or 

 the lower petals more united to the upper lip. 



§ 4. El-rhododendron. Inflorescence terminal ; the umbellate or somewhat 

 corymbose flowers from a separate strobilaceous bud (of mostly numerous and 

 well-imbricated caducous scales), terminating the growth of the previous year ; 

 the leaf-buds lateral and below : leaves coriaceous and persistent : calyx various, 

 usually small or minute : corolla mostly 5-lobed and little irregular : stamens 

 (commonly 10) and style rarely exserted, somewhat declined, or sometimes equally 

 spreading : flowers mostly large and showy, in early summer. — Eurhododendron 

 & Osmolkamnus (DC), Maxim. 1. c. 



# Not lepidote, glabrous or soon becoming so; the pubescence of young parts (if any) scurfy- 

 tomentose and deciduous; leaves ample and thick-coriaceous: stems and branches stout and 

 erect: flowers many in the cluster, mostly developing earlier than the leaf-buds: seeds scobiform 

 or scarious-appendaged at one or both ends. 



■h- Pacific species : pedicels wholly glabrous : calyx lobes very short and rounded. 

 R. Californicum, Hook. Shrub 3 to 8 feet high, glabrous : leaves broadly oblong, 

 3 to 6 inches long, obtuse with a mucronate or short-acuminate point, acute or acutish at 

 base: corolla rose-purple, broadly campanulate (over an inch long) ; the broad lobes un- 

 dulate : ovary rusty-hirsute. — Bot. Mag. t/4863 ; Gray, Bot. Calif, i. 458. — Woods, 

 California from Mendocino Co. extending into Oregon (E. Hall). Corolla much resem- 

 bling that of R. Catawbiense. 



