. Rhododendron. ERICACEiE. 41 



t- 2-4. — Swamps, Canada and Maine to Florida and Arkansas. Runs into manifold vari- 

 eties ; tlie fiiUowing being tliose most marlced : — 



Var. gla/UCUm. Leaves glaucous-wliitened beneatli, dull and sometimes glaucous 

 above also. — Azalea viscosa, var. glduca, Michx. 1. c. A. yluuca. Lam. 111. t. 110. It. glau- 

 cum, Don, 1. c. Form more strigose-hisjjid is A. hispida, Pursh, 1. c. (A'. Iiispidum, Torr. 1. c.) 

 A. scubi-a, Loddiges, &c. — New England to ^'irginia. 



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

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

 Jlountains, New York to Vu-ginia. 



++ ++ Flowers earlier and less fraen'ant, preceding or accompanying the leaves ; these soft-pubes- 

 cent beneath and more membranaceous, 1 to ^ inches long; the niidrib-and the branchlets either 

 slightly or not at all chaff}' -strigose or hispid: caly.x 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. — A:alea nudiflura, L. Spec, 

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

 cli/menoides & -1. canesceus, Miclix. I.e. A. bicolor, Vursh, I.e. RJiododendron canescens, bicoloi\ 

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

 Varying much in color, &c., at the south sometimes passing into yellow. JIany Iiybrid 

 forms are in cultivation. 



^R. calendtllaceum, Torr. I.e. Corolla from orange-yellow to flame-red; the tube 

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

 beneath. — Azalea cakndulacea, Michx. Fl. i. 151; Pursh, I.e.; Bot. Mag. t. 1721, 2143. — 

 Woods in the Alleghany Mountains, from Pennsj-lvania 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, anterioi-ly divided to the hase; the limb equalling the 10 stamens and st3de. 

 — Jilwdura, Dnhamel, in Linn. Geu. 



R. Rhodora, Don. ^V 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 ; JIaxim. 1. c. 

 liliodord Canadensis, L. ; L'Her. Stirp. i. 161, t. 68 ; Lam. 111. t. 364 ; Bot. JIag. t. 474 ; 

 Duham. Arb, ed. nov. iii. 53; Emerson, I.e. t. 2.5. Rliodora congesia, Moench. Rltodo- 

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

 northward to Newfoundland : fl. May. Mature leaves 1 to 24 inches long, glandular- 

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

 the lower petals more united to the upper lip. 



§ 4. EuRHODODEXDRON. 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 jirevious 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 

 & 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 scobiform 

 or scarious-appendaged at one or both ends. 



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

 R. Calif ornicUTQ, 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. 



