132 
RHAMNUS-RHUS. 
luleo'la , (dier’s weed, y.) leases lanceolate, undulate, entire, each side of the 
base toothed ; calyx 4-cleft; flowers in a spike. Introduced. 
RIIAMNXJS. 5—1. ( Rhcimni .) [From raio , to destroy, on account of the many thorns of 
some of its species.] 
alnifo'lias , (dwarf-alder, w-g. M. T 7 ) unarmed; leaves oval, acuminate, ser¬ 
rulate, pubescent on the nerves beneath; flowers dioecious; peduncles 1 - 
flovvei ed, aggregate ; calyx acute ; fruit turbinate ; berries black. Rocky 
hills. 
catkar"ticus , (buckthorn, y-g. T 7 .) branches spiny; leaves apposite, ovate; 
flowers 4-cleft, dioecious. Mountain woods. 
RHEUM. 9 -3. (Polygons .) [From Rha, an ancient name of the Wolga, on whose banks it 
was discovered.] 
palmo/la , (rhubarb, J. %.) leaves palmate, acuminate. Ex. 
rhapon"ticum. (pie rhubarb, w. J. Of.) 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 leaves very large, 
2-4 f. Ex. 
RHEXIA. 8—1. (Melastomicb.) 
mariana , (w-r. Ju. %) very hairy, leaves lanceolate, acute at each end, 3- 
nerved, sub-petiolate ; calyx tubular, nearly smooth. Yar. purpurea, has 
purple flowers; petals obovate, hairy on the outer surface. 
virgin”ica , (deer-grass, meadow-beauiy, p. Ju. '![.) stem with winged angles, 
square, somewhat hairy; leaves sessile, ovate-lanceolate, ciliate, serrate, 3- 
7- nerved, sprinkled with hairs on both sides; corymbs dichotomous. Wet 
meadows. 1 f. 
RHINANTHUS. 13—2. ( Pediculares .) [From rin , nose, and anthos , flower.] 
crista gal"ii, (yellow-rattle, y. J. (v>.) upper lip of the corolla arched ; calyx 
smooth; leaves lanceolate, serrate, opposite; flowersaxillary, somewhat 
spiked, yellow. Meadows. 
RIIIZOPHORA. 12—5. ( Salicaricc .) [From rhizo , root, and phero, to bear, on account of its 
peculiar root.] 
• man"gle , (mangrove, T 7 .) leaves acute, ovate, opposite; peduncles axillary; 
fruit clavate*; subulate. 
RHODODENDRON. 10—1. {Rhododendrcl.) [From rodon , a rose', dendron , tree ; so called 
because it resembles t Die rose.] 
max"imum , (wild rosebay, E. r. Ju. T 7 .) leaves oblong, glabrous, paler be¬ 
neath ; umbels terminal, dense ; corollas somewhat bell-form. 4-20 f. 
pon"ticum. (rosebay, p. I 7 .) leaves oblong, glabrous, both sides coloured alike ; 
corymbs terminal ; corolla bell-wheel-form ; petals lanceolate. Ex. 
lappon'icum , (p. Ju. I 7 .) 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. T 7 .) leaves alternate, oval, entire, pu¬ 
bescent-glaucous beneath ; flowers in terminal umbels or clusters, appear¬ 
ing before the leaves. Mountain bogs. 2 f. 
RHIJS. 5 —3. ( Terebintacecc .) [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 ; 
leaves pinnate, many-paired ; Iqafets lance-oblong, serrate, whitish beneath ; 
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. f>.) very smooth; leaves pinnate ; leafets 
in many pairs, oval, abruptly acuminate, entire ; panicles loose ; flowers di¬ 
oecious. A small tree. 
toxicoden"dron, (g-y. J-Ju. T 7 .) stem erect; leaves ternate; leafets broad, 
oval, entire or sinuate, dentate, sub-pubescent beneath ; flowers dioecious, 
in sessile, axillary racemes. 1-3 f. Yar. radicans , (poison ivy,) stem 
climbing. 
typhi'na , (stag’s-horn sumach, y-g. J. T 7 .) branches and petioles very villose 5 
