Rhododendron. ERICACEAE. 41 



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 viscosa, var. glaucu, Michx. 1. c. A: c/lauca, Lara. 111. t. 110. R. gUnt- 

 ciun, Don, 1. c. Form more strigose-hisi^id Is A. hisjiida, Pursli, 1. c. (R. hispiduin, Torr. 1. c.) 

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



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

 j-ard 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 ; tliese soft-pnbes- 

 cent beneatli and more membranaceous, 1 to ^ inches long; tlie midrib and the branchlets either 

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



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

 the viscid tid)e as long as or rather longer than the limb. — Azalea midijiora, L. Spec, 

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

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

 &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. — Azalea calendidacea, IMichx. Fl. i. 151; Pursh, 1. c. ; Bot. Mag. t. 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 hardly any tube, anteriorly divided to the base; the limb equalling the 10 stamens and style. 

 — Rkodorii, Duhamel, in Linn. Gen. 



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

 flowers somewhat preceding the leaves, slun-t-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. I.e. 

 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 con/jesta, Moench. Rhodo- 

 dendron pulchellunt, 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. Iiifioresceiice terminal ; the itmbellate or somewhat 

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

 well-imbricated caducous scales), terminating the growth of the j^revious year; 

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

 usually small or minute : corolla mostly o-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) scurfv- 

 tomentose and deciduous: leaves ample and tiuck-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. 



-)— Pacitic species : pedicels wholly glabrous : calyx lobes very sliort and rounded. 

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

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

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

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

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

 bling that of R. Cataivbiense. 



