CHAP. LXIX. ERICA‘CE. RHODODE/NDRON. 1135 
* 
arboretum it is named #. pénticum macrophyllum. The year of its intro- 
duction into British gardens is uncertain; nor has it been much cultivated. 
# 4. R. Pu’rsum G. Don. Pursh’s Rhododendron, or American Rose Bay. 
Identification. Don’s Mill., 3. p. 843. 
Synonyme. RK. maximum f album Pursh Fl. Amer. Sept., 1. p. 297. 
Spec. Char., §c. Arborescent. Leaves cuneate-lanceolate, flat, glabrous, tapering gradually to the 
base, paler beneath. Calycine segments oval, obtuse. Segments of corolla roundish-oblong. 
Flowers white, and smaller than those of 2. maximum. (Don’s M7il., iii. p. 843.) A native of New 
Jersey and Delaware, in shady cedar swamps; where it forms ashrub growing from 6 ft. to 8 ft. 
high, flowering from June to August. It was introduced in 1811, but is not common in col- 
ections, 
a 5. R. catawsBie’NsE Michr. The Catawba Rhododendron. 
Identification, Michx. Fl. Bor. Amer., 1. p. 258.; Don’s Mill., 3. p. 843. Lodd. Cat., ed. 1836. 
Engravings. Bot, Mag., t. 1671.; Lodd. Bot. Cab., t. 1176.; and our fig. 933. 
Spec. Char., §c. Leaves short-oval, rounded, and obtuse at both ends, gla- 
brous, of a different colour beneath. Calycine segments elongated oblong. 
Flowers purple, disposed in umbel- 
late corymbs. (Don’s Mill., iii. p. 
843.) It is a native of the high 
mountains of Virginia and Carolina, 
particularly near the head waters 
of the Catawba River, where it is 
ashrub, about 4 ft. high, flowering 
from June till August. Introduced 
in 1809, and now one of the most 
common species in gardens. It is of 
more robust growth than either 2. 
ponticum or R. maximum, but, in 
other respects, seems intermediate / 
between them. There are many 
hybrids in cultivation between it 
and the former species, though with- 
out names; partly from the minuteness of the shades of distinction 
between them, and partly from their having been raised by nurserymen who 
had not sufficient influence or energy to bring them under the notice of 
botanists. There are some very distinct varieties in the Knaphill Nursery. 
Plants vary in price from 1s. to 5s. 



Varieties. 
# R.c. 2 Russellianum Brit. Fl.-Gard., 2ds., t.91., Don’s Mill., iii. 
p- 843.—Leaves oblong, finely tomentose beneath. Corymbs many- 
flowered. Flowers ofa bright rosy red, approaching to crimson. A 
hybrid raised from the seed of R. catawbiénse, impregnated by the 
pollen of R. arboreum, by Mr. Russell of Battersea. It is a very 
splendid variety, but somewhat tender. 
# R. c. 3 tigrinum Hort. is a variety with a corolla much resembling 
that of R.c. Russellidnwm, but with obvious spots on the inside. 
» 6. Rk. curysa’ntuum L. The golden-flowered Rhododendron. 
Identification. Lin. Syst., 405., Suppl., 237. ; Don’s Mill., 3. p. 843. ; Lodd. Cat., ed. 1836. 
Synonyme.  R. officinale Sadish., p. 121. t. 54. 
Engravings. Pall. Itin. Append., p. 729. No. 87. t. n. f. 1—2. ; Fl. Ross., 1. p. 44. t. 20.; Woodv. Med. 
Bot., 433. t. 149. ; Salisb. Par. Lond., t. 80. ; Gmel. Sib., 4. t. 54. 
Spec. Char., §c. 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. Seg- 
ments of the corolla rounded. Ovarium tomentose. Branches decum- 
bent, beset with rusty stipula-formed scales. Flowers handsome, large, 
drooping, revolute, rather irregular, yellow. Stigma 5-lobed. (Don’s Mill. 
ili, p. 844.) It is a native of Siberia, on the highest mountains ; and 
of Caucasus, where it forms a low evergreen undershrub, growing from 
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