132 
RHAMNUS-RHUS. 
luteon,a, (dier's weed, y.) leaves lanceolate, undulate, entire, each side of the 
base toothed ; calyx 4-cleft ; flowers in a spike. Introduced. 
EHAMNUS. 5 — 1. {Rhamni.) [From raio^ to destroy, on account of the many thorns of 
some of its species.] 
alnifo'lias, (dwarf-alder, w-g. M. h ) unarmed; leaves oval, acuminate, ser 
rulate, pubescent on the nerves beneath; flowers dicGcious; peduncles I 
flowered, aggregate ; calyj: acute ; fruit turbinate ; berries black. Rocky 
hills. 
cathar"iicus, (buckthorn, y-g. Tj.) branches spiny ; leaves opposite, ovate ; 
flowers 4-cleft, dicEcious. Mountain woods, 
RHEUM. 9—3. (Polyganoi.) [From JR/^a, an ancient name of the Wolga, on whose banks is 
was discovered.] 
palmo/ta, (rhubarb, J. %.) leaves palmate, acuminate. Ex. 
rhapon"ticmn, (pie rhubarb, w. J. %..) leaves heart-ovate, obtuse and acute, 
smooth ; veins sub-pilose beneath, the sinuses at the base dilated ; petioles 
furrowed on the upper side, rounded at the edge ; radical kaves very large. 
2-4 f. Es. 
SIHEXIA. 8—1. (Melastomm.y 
mario/iia, (w-r. Ju. %) very hairy, leaves lanceolate, acute at each end, 3-- 
nerved, sub-petiolate ; calyx tubular, nearly smooth. Var. purpurea, has 
purple flowers; petals obovate, hairy on the outer surface. 
virgin^ica, (deer-grass, meadow-beauty, p. Ju. ^4-.) stem with winged angleSji, 
square, somewhat hairy ; leaves sessile, ovate-lanceolate, eiliate, serrate, 3~ 
7- nerved, sprinkled with hairs on both sides; corymbs dichotomous. WeS 
meadows. 1 f. 
HHINANTHUS. 1^—2: {Pedicular es.) [From rin, nose, and anthos, flower.] 
cristagaVli, (yellow-rattle, y. J. <v).) upper lip of the corolla arched ; calyx 
smooth; leaves lanceolate, serrate, opposite; flowers axillary, somewhat 
spiked, yellow. Meadows, 
RHIZOPHORA. 12 — 5. {SalicaricB.') [From rhizo, root, and phero, to bear, on account of its 
peculiar root.] 
man^gle, (mangrove, h-) leaves acute, ovate, opposite; peduncles axillary; 
fruit clavate, subulate, 
EHODODENDRON. 10—1. (Rhodndendra.) [From rodon, a rose, dendron, tree ; so called 
because it resembles the rose.] 
maz'Hmiim, (wild rosebay,^ E. r. Ju. Tj.) leaves oblong, glabrous, paler be- 
neath ; umbels terminal, d^ense ; corollas somewhat bell-form. 4-20 f. 
pon/'ticum, (rosebay, p, leaves oblong, glabrous, both sides coloured alike 
corymbs terminal ; corolla bell-wheel-form ; petals lanceolate. Ex, 
lafpon'icum, (p. Ju. I7.) flowers in terminal, leafy clusters, campanulate; sta- 
mens mostly 8 ; leaves elliptical,, punctured, coriaceous, evergreen ; shrub 
8- 10 i. White hills, 
RHODORA. 10—1. (Rhododendra.) 
canaden'sis, (false honeysuckle, p. M. I2.) leaves alternate, oval, entire, pu- 
bescent-glaucous beneath; flowers in terminal umbels or clusters, appear- 
ing before the leaves. Mountain bogs. 2 f. 
RHUS. 5—3. (TerebintaceeB.) [From reo, to flow, so called because it was supposed to be 
useful in stopping haemorrhages.] 
gla'brum, (sleek-sumach, g. r. Ju. T^.) branches, petioles, and leaves glabrous j 
leaves pinnate, many-paired ; leafets lance-oblong, serrate, whitish beneath j 
fruit silky. The leaves are used for tanning morocco leather. Berries 
red and sour. 6-12 f. 
ver'nix, (poison-sumach, y-g. J-Ju. I7.) very smooth; leaves pinnate; leafets 
in many pairs, oval, abruptly acuminate, entire ; panicles loose ; flowers di- 
OBcious. A small tree. 
toxicoden'^dron, (g-y- J-Ju, Tj-) stem erect; leaves ternate j leafets broad, 
oval, entire or sinuate, dentate, sub-pubescent beneath; flowers diojcious, 
in sessile, axillary racemes. 1-3 f, Var, radicans, (poison ivy,) stem 
climbing. 
typhi'tm, (stag's-horn sumach, y-g. J. T^.) branches and petioles very villosej 
