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. glauca, Michx. 1. c. A. rjluuca, Lam. 111. t. 110. R. rjlau- 

 cum, Don, 1. c. Form more strigose-hisind is A. /tisj)tda, Pursh, 1. c. {R. hispiduin, Torr. 1. c.) 

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



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

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

 Mountains, New York to Virginia. 



■H- ++ Flowers earlier and less fragrant, preceding or aceon-ipanyinc: the leaves ; tliese soft-pubes- 

 cent Ijeneath and more membranaeeoiis, 1 to 3 inches long; the midrib and the branchlets either 

 slightly or not at all chaff^v-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 nudifiora, L. Spec, 

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

 clymenoides & 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. 



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 calendulacea, Michx. Fi. i. IGl; Pursh, 1. c. ; Bot. Mag. t. 1721, 214C. — 

 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. 

 — lihoiliu-d, Duhamel, in Linn. Gen. 



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

 flowers s(niiewhat preceding the leaves, short-pedicelled : calyx very small : corolla less 

 than an inch long, purplish-rosc-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. ; L'Her. Stirp. i. 101, t. G8 ; Lam. 111. t. 364 ; Bot. Mag. t. 474 ; 

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

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

 nortliward to Newfoundland : fl. May. Mature leaves 1 to 2^ inches long, glandular- 

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

 the lower petals more united to the upper lip. 



§ 4. EuRiiODODENDRON. lufloresceiice terminal ; the umbellate or somewhat 

 corymbose flowers IVom a sejaarate strobilaceous bud (of luostly numerous and 

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

 the leaf-buds lateral and below : leaves coriaceous and jiersistent : 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. — Eit rhododendron 

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



# Not lepidote, glabrous or soon beconung so; the pid)escence of young parts (if an}') 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. 



-i— 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 (> inches long, obtuse with a mucronate or short-aciuninate point, acute or aciUish at 

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

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

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

 bling that of A'. Caiawbiense. 



