Rhododendron. ERICACE^. ^\ 



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 &\&o.— Azalea viscosa, var. glauca, Michx. 1. c. A. glauca, Lara. 111. 1. 110. R glau- 

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

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



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

 yard high. — iJ. nitidum, Torr. 1. c. Azalea nltida, Pursh, 1. c; Lindl. Bot. Reg. t. 414 _ 

 Mountains, New York to Virginia. 

 •H- ++ Flowers earlier and less fragrant, preceding or accompanying the leaves ; these soft-nubes- 



cent beneath and more nierabranaceous, 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 limh. — Azalea nudijlora, L. Spec' 

 ed. 2, 214; Sims, Bot. Mag. 1. 180; Emerson, 1. c. t. 24. A. lutea, L. Spec. ed. 1. A. peri', 

 dymenoides & A. canescens, Michx. 1. c. A. hicolor, Pursh, 1. c. Rhododendron canescens, bicolm; 

 &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. 



R. calendulaceum, 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. — ^^a/ea cafe?!c/«/acea, Michx. Fl. i. 151; Pursh, l.'c. ; Bot. Mag. 1. 1721, 2143.— 

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

 into the middle country. 



* * ^'™]',''^ceous flower-buds of fewer and early caducous scales : corolla irregular, with a short 



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

 — Jikodora, 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-Iobed ; the anterior of two oblong-linear and recurving nearly or quite distinct petals : 

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

 Rhodora Canadensis, L. ; 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. EuRHODODENDRON. 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 S-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 

 & Osmothamnus (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 scobiforni 

 or scarious-appendaged at one or both ends; 



-1— Pacific species: pedicels wholly glabrous : calyx lobes very short and rounded. 

 R. Calif ornicum, 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 

 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. 



