» nectariferous, rarely ornamented with scales. 
ERICACEH. XLIII. Ruopopenpron. 
D. Don, in edinb. phil. journ. 17. p. 152. Rhodoràceæ, Juss. 
gen. 158. Anthers 2-celled. Ovarium free. Hypogynous disk 
1 : 1 Buds strobile- 
like from imbricated scales. Leaves flat, having the extremity 
of the midrib callous. 
XLIII. RHODODE’NDRON (from fodoy, rhodon, a rose, 
and devdpor, dendron, a tree ; in reference to the terminal bunches 
of flowers, which are usually red). Lin. gen. no. 548. Schreb. 
gen. no. 746. Geertn. fruct. 1. p. 304. t. 63. Juss. gen. 158. 
D. Don, in edinb. phil. journ. prod. fl. nep. p. 152.—Azalea 
species of authors.—Rhodora, Lin—Chameerhododendros,Tourn. 
inst. t. 373. 
Lin. syst. Penta-Decdndria, Monogynia. Calyx 5-parted. 
Corolla somewhat funnel-shaped, or campanulate ; rarely rotate 
or 5-parted ; limb 5-cleft, somewhat bilabiate; upper lip the 
broadest, and usually spotted. Stamens 5-10, usually exserted, 
declinate ; anthers opening by 2 terminal pores. Capsule 5-celled, 
5-valved, rarely 10-celled and 10-valved, as in R. arbdreum, 
with a septicidal dehiscence at the apex. Placentas simple, an- 
gular. Seeds compressed, scobiform, winged.—Shrubs or trees, 
usually evergreen. Leaves alternate, quite entire, terminated 
by a spacelate apex, or yellow gland. Flowers terminal, corym- 
bose, showy. 
Limb of calyx short, 5-lobed. Co- 
Ovarium 5-celled.— Leaves 
Secr. I. Po’nticum. 
rolla campanulate. Stamens 10. 
coriaceous, evergreen. 
1 R. Po'xticum (Lin. spec. 562.) leaves oblong-lanceolate, 
glabrous on both surfaces, attenuated towards the thick petioles, 
with a streak on the upper surface, of a wide lanceolate form ; 
racemes short, corymbose. h. H. Native of Asia Minor, at 
Pontus ; and of Gibraltar, Iberia, and Caucasus, in wet places in 
beech and alder coppices. Pall. fl. ross. 1. p. 43. t. 29. Jacq. 
icon. rar. 1. t. 78. Lam. ill. 364. Curt. bot. mag. 650. Leaves 
sometimes becoming ferruginous beneath. Corolla purple, large, 
with ovate, acute, or lanceolate segments. Calyx minute, 5- 
toothed, somewhat cartilaginous. This is a very common plant, 
of which there are a great many varieties. The most remark- 
able are those with white, red, or bluish flowers, and striped 
leaves; Tournefort has related that the flowers of this species 
were reputed to impart a noxious quality to honey; this Giilden- 
Stadt contradicts, and imputes it to Azalea Péntica. 
Var. B, obtisum (Wats, dendr. brit. t. 162.) leaves subcordate, 
coriaceous, obtuse; calyx very short, unequally and undulately 
crenated. h. H. Native of Pontus. Shrub 3-4 feet high. 
Flowers purple. 
Var. y, myrtifolium (Lodd. bot. cab. 908.) leaves small ; 
flowers purple. h. H. Native of Gibraltar. 
Var. 6, Smithii (Sweet, fl. gard. n. s. t. 50.) leaves lanceolate, 
clothed with white tomentum beneath ; corymbs many-flowered ; 
Ovarium tomentose, 10-celled ; flowers of a rosy purple, ap- 
proaching to crimson, elegantly spotted with black. h.H. A 
hybrid, raised by Mr. Smith, of Coombe Wood, from the seed of 
R. Pénticum, impregnated by the pollen of R. arboreum. 
Pontic Rhododendron or Rose-bay. Fl. May, June. Clt. 
1763. Shrub 6 to 12 feet. 
2 R. ma’ximum (Lin. spec. p. 563.) arborescent ;_ leaves 
elliptic-oblong, acute, convex, bluntish at the base, whitish or 
rusty beneath, glabrous; calycine segments oval-obtuse : seg- 
ments of corolla roundish. p. H. Native from Canada to 
Carolina, on the mountains near rivulets and lakes. Sims, bot. 
mag. 951. Lam. ill. 364.—Schmidt, abr. t. 121.—Mill. fig. 229. 
—Catesb. car. 3. t. 17. f. 2. Flowers pale red, in umbellate 
corymbs, studded with green, yellow, or purple protuberances. 
Largest Rhododendron or American Rose-bay. Fl. June, 
Aug. Clt. 1736. Shrub 10 to 15 feet. 
843 
3 R. purpu'reuM; arboreous; leaves large, oblong-elliptic, 
flattish, acute, bluntish at the base, green and glabrous on both 
surfaces; segments of corolla oblong, obtuse. h. H. Native 
of Virginia and Carolina, on the highest mountains, near lakes. 
R. maximum y, purpireum, Pursh, fl. amer. sept. 1. p. 297. 
Flowers large, purple. Calycine segments obtuse. This shrub 
approaches near to R. Pónticum, but it differs in its foliaceous 
calyx, and otherwise. It grows to an immense size; its stem 
is often found 18 inches and more in diameter, and its foliage 
triple the size of any other species. 
Purple-flowered Rhododendron. 
20 feet. 
4 R. Pu`rsui: arborescent; leaves cuneate-lanceolate, flat, 
glabrous, tapering gradually to the base, paler beneath; caly- 
cine segments oval, obtuse ; segments of corolla roundish- 
Fl. May, June. Clt.? Tree 
oblong. k. H. Native of New Jersey and Delaware, in 
shady cedar swamps. R. maximum £, álbum, Pursh, fl. amer. 
sept. 1. p. 297. Flowers white, smaller than those of R. 
maximum. 
Pursh’s Rhododendron, Fl. June, Aug. Clt. 1811. Shrub 
6 to 8 feet 
5 R. MACROPHY'LLUM (D. Don, mss. in herb. Lamb.) leaves 
lanceolate, acute, glabrous on both surfaces, as well as the pe- 
duncles, rounded at the base; ovarium bristly. h.H. Native 
of the north-west coast of America, where it was collected by 
Menzies. Petioles an inch long. Leaves 7-8 inches long. 
Flowers copious, smaller than those of R. máximum, white. Caly- 
cine lobes short, rounded. Filaments glabrous. 
Long-leaved Rhododendron. Shrub. 
6 R. Catawsie’nsz (Michx. fl. bor. amer. 1. p. 258.) leaves 
short-oval, rounded, and obtuse at both ends, glabrous, of a 
different colour beneath; calycine segments elongated, oblong. 
hk. H. Native on the high mountains of Virginia and Caro- 
lina, particularly on the head waters of the Catawba River. 
Sims, bot. mag. 1671. Lodd. bot. cab. 1176. Flowers purple, 
disposed in umbellate corymbs. 
Var. B, Russellidnum (Sweet. fl. gard. n. s. t. 91.) leaves oblong, 
finely tomentose beneath; corymbs many-flowered; flowers of 
a bright rosy red, approaching to crimson. kh.H. A hybrid, 
raised from the seed of R. Catawbiénse, impregnated by the 
pollen of R. arboreum, by Mr. Russell, of Battersea. 
Catawba Rhododendron. Fl. June, Aug. Clt. 1809. Shrub 
4 feet. 
7 R. Bracuyca’rpum (D. Don, mss. in herb. Lamb.) leaves 
elliptic-oblong, obtuse, clothed with rusty tomentum beneath, 
rounded at the base; ovaries 5-celled, and are as well as the 
peduncles hairy.? h. H. Native of op Petioles half 
an inch long. Leaves 3 inches long. Calycine lobes very 
short, roundish, revolute, callous. Style elongated. Stigma 
clavate. 
Short-fruited Rhododendron, Shrub. 
8 R. curysa’NtHUM (Lin. 
syste 405. suppl. 237.) leaves 
acutish, attenuated at the base, 
oblong, glabrous, reticulately 
veined, and of a rusty colour 
beneath ; flowers and buds 
clothed with rusty tomentum ; 
pedicels hairy; calyx hardly 
any; segments of the corolla 
rounded ; ovarium tomentose. 
. H. Native of Siberia, on 
the highest mountains, and of 
Caucasus. Pall. itin. append. 
p. 729. no, 87. t. N. f. 1-2. 
fl. ross. 1. p. 44. t. 30. Woodv. 
med. bot. 433. t. 149. Plenk, 
5P2 , 
FIG, 141. 
