Part 1, 1914] ERICACEAE 47 
1. Rhododendron maximum L,. Sp. Pl. 392. 1753. 
Rhododendrom purpureum G. Don, Gen. Hist. 3: 843. 1834. 
Rhododendron Purshii G. Don, Gen. Hist. 3: 843. 1834. 
An evergreen shrub commonly 5 m. tall, or rarely a small tree, with scurfy-pubescent 
twigs; leaf-blades oblong or oblong-oblanceolate, 10-25 cm. long, acute or short-acuminate, 
glabrous, or somewhat scurfy beneath, bright-green above, pale-green beneath, abruptly 
narrowed at the base, the stout petioles tomentulose when young; calyx-lobes ovate to oblong, 
mostly longer than wide; corolla mainly white or pink, often somewhat greenish in the throat 
and with yellow or orange spots within, broadly campanulate, 2-3 cm. long, the lobes not 
crisped; filaments slender, the longer ones about 2 cm. long; anthers about 2 mm. long; style 
elongate; capsules narrowly oblong or cylindric-oblong or slightly narrowed upward, 1-1.5 cm. 
long; seeds Jess than 2 mm. long. 
TYPE LOCALITY: Virginia. 
Distrisution: Nova Scotia to Ontario, Ohio, Georgia, and Alabama. 
ILLUSTRATIONS: Lam. Tab. Encyc. pl. 364; Bot. Mag. fl. 951; Michx. f. Hist. Arb. Am. 3: 
pl. 4; Schkuhr,.Handb, pl. 117; Bigel. Med. Bot. pl. 51; Sarg., Silva pl. 238; Britt. & Brown, Ill. Fl. 
f. 2750; ed. 2. f. 3222; Sarg. Man. f. 582; Britton, N. Am. Trees f. 687. 
2. Rhododendron catawbiense Michx. Fl. Bor. Am. 1: 258. 1803. 
An evergreen shrub commonly 1-3 m. tall, or rarely a small tree, with finely pubescent 
twigs; leaf-blades oblong, elliptic, or oval, 7~16 cm. long, abruptly pointed at the apex, glabrous, 
dark-green above, pale-green beneath, mostly rounded or subcordate at the base, the stout 
petioles pubescent; calyx-lobes half-orbicular or broadly deltoid, much wider than long; corolla 
rose-purple or lilac-purple, broadly campanulate, 3.5-5 cm. long, the lobes scarcely undulate; 
filaments slender, the longer ones about 3 cm. long; anthers about 3 mm. long; style elongate; 
capsules narrowly oblong, or slightly enlarged at the base, 2—2.5 cm. long; seeds less than 3 mm, 
long. 
TYPE LocALITy: High mountains of North Carolina. 
DistRIBUTION: Mountains of Virginia and West Virginia to Georgia and Alabama; rarely east~ 
ward to near the coastal plain. 
ILLUSTRATIONS: Bot. Mag. pl. 1671; Bot. Cab. pl. 1176; Britt. & Brown, Ill. Fl. f. 2751; ed. 2. 
Ff. 3223; Britton, N. Am. Trees f. 688; Lounsberry, S. Wild FI. #1. 120. 
3. Rhododendron californicum Hook. Bot. Mag. pl. 4863. 1855. 
A shrub 3 m. tall or less, or sometimes a small tree, with glabrous twigs; leaf-blades oblong, 
elliptic, or somewhat spatulate, 6-15 cm. long, obtuse and mucronate at the apex, glabrous, 
paler beneath than above, acute to rounded at the base, the stout petioles glabrous; calyx-lobes 
very broad and very short, much wider than long; corolla rose-purple, broadly campanulate, 
3-4 em. long, the lobes undulate; filaments stout, the longer ones about 2 cm. long; anthers 
2.5-3 mm. long; style short; capsules ovoid, 1.5—2 cm. long; seeds fully 3 mm. long. 
TYPE LOCALITY: Mountains of California. 
DisrriButTion: British Columbia to California. 
InLusTRaTION: Bot. Mag. pl. 4863; Britton, N. Am. Trees f. 689; M. E. Parsons, Wild Fl. Calif, 
235. 
4. Rhododendron macrophyllum G. Don, Gen. Hist. 3: 843. 1834. 
An erect shrub 5 m. tall or less, with glabrous twigs; leaf-blades oblong or slightly broad- 
ened upward, 12-20 cm. long, abruptly pointed at the apex, glabrous, paler beneath than 
above, somewhat acuminate at the base, the very stout petioles glabrous; calyx-lobes very 
broad and short, much wider than long; corolla white, campanulate, less than 3.5 cm. long, 
the lobes oblong; capsules oblong, about 1.5 cm. long; seeds about 3.5 mm. long. 
TYPE LOCALITY: Northwestern coast of America. 
DistRIsuTION: Washington. 
5. Rhododendron carolinianum Rehder, Rhodora 14: 99. 1912. 
A much-branched shrub, with resinous-dotted foliage; leaf-blades elliptic, oblong-elliptic, 
or somewhat broadened upward, 8-13 cm. long, acute or acuminate at both ends, somewhat 
