: I.
5 9 0 A R B O R E T U M E T F R U T IC E T U M B R IT A N N IC U M .
flowers, except one found in Java by Dr. Horsfield. {Doris Mill.) A
glabrous evergreen shrub. Nepal, on Gossainthan. Height 3 ft. to 6 ft.
Introduced in 1825. Flowers pale pink, changing to white ; April.
A beautiful and very distinct species, and quite as hardy in British gardens
as any of the American kinds.
Wiododéndt'on arhòrexim Smith.—Several hybrids between this species and
li. pónticum and R. catawbiense have been raised, but those only between
the American and the more northerly European species have been found
tolerably hardy.
R. a. venustum D. Don (Brit. Fl.-Gard. May, 1835, 2d ser. t. 285.) is a
hybrid, and an exceedingly showy and interesting plant. I t was raised by
Mr. Win. Smith, nurseryman, Norbiton Common, near Kingston, Surrey,
from seeds of R. caucasicum that had been fertilised by the pollen of R.
arboreum ; and appears sufficiently hardy to survive our winters with a little
protection.
§ iii. Pogonanthum.
Derivation. From pogon, a beard, and anthos, a flower j throat woolly inside.
Sect.Char. Limb of calyx short, 5-lobed. Corolla salver-shaped, with a cylindrical
tube, and a spreading limb. Stamens 5, enclosed. Ovarium 5-celled.
Evergreen shrubs. Leaves coriaceous.
a . 13. R. a n t h o p o 'g o n D. Don. The bearded-flowered
Rhododendron.
Identification. D. Don in Mém. Wern. Soc., 3. p. 409. ; Don’s Mill., 3. p. 84-5.
Synompne. R. aromàticum Wall. Cat.
Engravings. Royle lilust., t. 64. f. 2. ; and o u r/g . 1115.
Spec. Char., 4’c. Bi’anchlets downy. Leaves oval, rusty
beneath from lepidoted tomentum. Corollas with a woolly
throat. Shrub much branched. Leaves ending in a
reflexed mucro, naked above. Flowers glomerate, sulphur-
coloured. Pedicels short, lepidoted, and resinous. Calycine
segments rounded at the apex, with villous margins.
Segments of corolla roundish, with undulated curled
margins. Filaments glabrous. Stigma davate. (JDoris Mül.)
An upright evergreen shrub, with the habit of R. daùricum.
Nepal, on Gossainthan. Height 1ft. to I^ ft. Introduced
in 1820. Flowers yellow ; April and May.
A very interesting species, from the colour of its flowers
and their early appearance. Plants have survived the
winter of 1837-8 in the Hackney Arboretum. ni5. Ä-amhopog,
§ iv. Lepipherum D, Don.
Derivation. From lepis, a scale, and pkero, to bear ; leaves covered with small scales.
Sect. Char. Limb of calyx dilated, 5-lobed. Corolla campanulate or rotate.
Stamens 10. Ovarium 5-celled. Leaves membranous; sometimes deciduous,
but generally persistent. Shrubs, evergreen or deciduous ; natives of Europe,
North America, and the Himalayas.
9*. 14. R. l a p p o 'n i c u m Wahl. The Lapland Rhododendron.
Identification. Wahl. F l. Suec., p. 249. ; Don’s Mill., 3. p. 845.
Synonymes. Azàlea lappónica L in. Fl. Suec. p. 64., Sp. t. 214. ; A. ferruginea Hori.
Engravmgs. Bot. Mag., t. 3106. ; and o u r /g . 1116.
Spec. Char., 4'C. Shrub branched, procumbent. Branches divaricate. Corollas
rotately funnel-shaped. Young branches obscurely pubescent, warted.
Leaves oblong, obtuse, stiff beset with honeycomb-like dots, yellowish and
scaly beneath ; deep green above ; and pale green, and at length yellowish,
beneath ; thickly beset with hollow dots on both surfaces, which are covered
X L I I I . j^ r i c a ' c e a c : j í h o d o d e ' n d r o n .
by umbilicate permanent scales. Flowers crimson,
disposed in umbellate corymbs, 5—6 together, surrounded
by large dotted scales, or bracteas. Calyx
covered with yellow scales, ciliated. Segments of
corolla unequal, and undulated. Stamens 5—8, equal*
in length to the corolla. Stigma capitate, 5-lobed.
Filaments hairy at the base. (Doris Mill.) A procumbent
evergreen shrub. Europe, Asia, and North America,
in the Arctic regions. Height 6 in. to 1 ft. Introduced in
1825. Flowers crimson ; May.
59]
The Dahurian Rhododendron.
m 15. R. d a u ' r i c u m L.
Identification. Lin. Sp., 562.; Don’s Mill., 3.
Engravings. Pall. Fl. Ross., 1. p. 47. t. 32.;
Jfe. 1117.
845.
ig., t. 836. ; and our
Spec, Char., 4-e. Leaves deciduous ; oblong, attenuated at both ends, glabrous,
but sprinkled with rusty scales, especially beneath. Limb of calyx 5-toothed.
Corollas rotate. Roots knobbed, abounding in fibres. Stems twisted
and knobbed in the wild state. Petioles downy. Leaves dotted on both
surfaces, but ferruginous beneath. Before they fall in autumn, they become
of a dusky red colour. The flowers rise before the leaves,
from the tops of the branches, from buds which are composed
of concave downy scales. {Doris Mill.) A deciduous
shrub. Siberia, peculiar to the alpine tracts of Eastern
Asia. Height 2 it. to 6 ft. Introduced in 1780. Flowers
purple ; December to March.
Variety.
m 'K. d .2 atrovh-ens Ker. (Bot. Reg., 1 .194 ; Bot. Mag.,
t. 1888.) — Sub-evergreen. Leaves deep green, and
shining above ; persistent. Siberia.
Very desirable low shrubs, from their flowering so early in
the season ; but, to thrive, they require peat soil. 1117. K.dai.ncwn.
R. lepidòtum Wall. (Royle Illust., p. 260. t. 64. f. 1. ; Don’s Mill., 3. p. 845.)
is a native of Nepal, with the habit of R. daùricum, bnt with leaves of a
thinner texture; and with every part of the plant beset with ferruginous
scale-like dots. I t grows to the height of 2 or 3 feet, but has not yet been
introduced.
§ V. Cliamacistiis D. Don.
e ; plants Derivation. From chamai, on the ground, and cistus, the rock 1 with the habit of
species of Heliánthemum.
Sect. Char. Limb of calyx foliaceous, Srijleft. Corolla rotate. Stamens 10.
Ovarium 5-celled. Diminutive, prostrate, evergreen
shrubs, with small membranous leaves.
16. r t . c a m t s c h a ' t i c u m Pall. The Kamtschatka
Rhododendron.
Identification. Pall. F l. Ross., 1. p. 48. t. 33.; Don’s Mill., 3. p. 845.
Engravings. Gmel. .Sib., 4. p. 126. No. 13. ; and o u r/g . 1118.
Spec. Char., S/c. Leaves obovate, acutish, 5-nerved,
naked, ciliated; peduncles hairy, usually twin. Calycine
segments ciliated, foliaceous. Corollas purple,
rotate. {Doris Mill.) A prostrate evergreen shrub.
Kamtschatka and the Aleutian Islands, in muddy
places on the mountains. Height 6 in. to 1 ft. Introduced
in 1802, but rare in British gardens. Flowers
purple; July.