154 



RHEUM— RHODODENDRON. 



alnif alius, (dwarf-alder, w-g. M. ■^.) tin- 

 armeu; leaves oval, acuraiuate, serrulate, 

 pubescent on tlie nerves beneath ; flowers 

 dioecious; peduncles 1-flowered, aggregate; 

 calj^x acute ; fruit turbinate ; berries black. 

 Rocky hills. 



cathar"ticus, (buckthorn, y-g. ^ .) branches 

 spiny ; leaves opposite, ovate ; flowers 

 4-cleft, dioecious. Mountain woods. 



frcnguloi'Jcus, (w-g. M. ^ .) unarmed ; 

 leaves ^oval, acuminate, serrulate, pubes- 

 cent at the nerves beneath ; peduncles ag- 

 gregate, 1-flowered ; calyx acute ; fruit 

 turbinate ; berries black. 



caroUn"ia'nu!^, (^v. J. ^.) unarmed; 

 leaves alternate, oval-oblong, sub-entire, 

 ribbed, glabrous ; umbels peduncled ; flo^v- 

 ers all fertile ; berry black, globose. 4-6 f. 



lanccoln'tus, ( ^ .) unarmed ; leaves nearly 

 opposite, oval, serrulate ; flowers very mi- 

 nute, divisions spiked, alternately sessile on 

 the rachis ; style 3-cleft ; bei-ries 3-seeded. 



parvifoUus, unarmed ; leaves ovate, ser- 

 rulate, w^hen young, pubescent, acute, or 

 emarginate ; flowers solitary, or 2 to 3 to- 

 gether, axillary, short-pedicelled, tetan- 

 drous ; petals minute, 2-lobed, partly sur- 

 rounding the very short stamens ; styles 2, 

 united below, very short and conical. S. 



minutijlo'rns, (Oc. 1? .) unarmed ; leaves 

 nearly opposite, oval, serrulate ; flowers 

 very minute, divisions spiked, alternately 

 sessile on the rachis ; style 3-cleft ; berries 

 3-seeded. 

 RHE'UM. 9— .1. (Polygoncp.) [From KAa, an 



ancient name of the Wolga, on whose banks 



it was discovered.] 



palma'ta, (rhubarb, J. If.) leaves pal- 

 mate, acuminate. Ex. 



Thapon"ticum, (pie rhubarb, w. J. 2/.) 

 leaves heart-ovate, obtuse and acute, 

 smooth ; veins sub-pilose beneath, the sinu- 

 ses at the base dilated ; petioles furrowed 

 on the upper side, rounded at the edge ; 

 radical leaves very large. 2-4 f. Ex. 

 RHFX"IA. 8—1. [Mdastomim.) 



■maria'na, (w-r. Ju. 2X-) veiy hairy; 

 leaves lanceolate, acute at each end, 3- 

 nerved, sub-petiolate ; calyx tubular, nearly 

 smooth. Var. piirpu'rea, has purple flow- 

 ers; petals obovate, hairy on the outer sur- 

 face. 



virgm"ica, (deer-grass, meadow-beauty, 

 p. Ju. 2^.) stem with winged angles, square, 

 somewhat hairy ; leaves sessile, ovate-lan- 

 ceolate, ciliate, serrate, 3-7 nerved, sprin- 

 kled with hairs on both sides ; corymbs di- 

 chotomous. Wet meadows. 1 f. 



cilio'sa, (p. Ju. 2^.) stem nearly square, 

 smooth ; leaves sub-petioled, oval,serrulate, 

 ciliate, 3-nerved, glabrous beneath, slightly 

 hispid above; flowers involucred. 12-18 i. 



glahel'la, (deer-grass, p. Ju.) glabrous, 

 stem terete ; leaves lanceolate and ovate, 

 3-nerved, denticulate, slightlj glaucous ; 

 calyx glutinous. 2-3 f. S. 



serrulalta, (p. 2^.) stem nearly square, gla- 

 brous ; leaves small, sub-petioled, roundish- 

 oval, acute, smooth on both sides, margin 

 serrulate, base sub-ciliate ; flowers pedun- 

 •iled, about in threes ; calyx glandular-hir- 

 sute. 6-10 i. (S. 



I lu'tea, (y. Ju. 0.) hirsmte ; leaves Iinea^ 

 I lanceolate, sometimes wedge-form at the 

 base, 3-nerv'cd ; panicle pyramidal ; an 

 thers erect, terminal. 18 i. S. 



angnstifo'lia, (w. Ju. 11-) anthers incum- 

 bent ; leaves linear and lance-linear, soirie- 

 what clustered ; plant hirsute. <S. 



stric"ta, (p. J. li.) stem 4-angled, straight, 

 winged, glabrous, bearded at the joints; 

 leaves sessile, narrow-lanceolate, acumi- 

 nate, 3-nervcd, glabrous on both sides ; cor- 

 ymb dichotomous. S. 



lincarifo'lia, (y.) stem cylindrical, sub- 

 pubescent ; leaves alternate, linear, oblong, 

 obtuse, sessile, pubescent on both sides ; 

 flowers generally solitary. S. 

 RHINAN"THUS. 13-2. {Pcdiculares.) [From 



rin, nose, and anthos, flower.] 



cristagaV'li, (yellow-rattle, y. J. 0.) up- 

 per lip of the corolla arched ; calyx smooth; 

 leaves lanceolate, serrate, opposite ; flow- 

 ers axillary, somewhat spiked, yellow 

 Meadows. 

 RHIZOPHO'RA. 12-5. (Salicaria.) [From 



rhizo, root, and phero, to bear, on account of 



its peculiar root.] 



man"gle, (mangrove, '^ .) leaves acute 

 ovate, oppo.site ; peduncles axillary ; ft ait 

 clavate, subulate. 

 RHODODEN"DRON. 10-1. (Rhododendra.) 



[From rodon, a rose, dendron, tree ; 9o called 



because it resembles the rose.] 



7nax"i7num, [wild rosebay, E. r. Ju. Tp.) 

 leaves oblong, glabrous, paler beneath 

 umbels terminal, dense ; corollas some- 

 what bell-form. Var. rose'um, corolla 

 pale rose-color; segments roundish; leaves 

 obtuse at the base. Var. aV'hum, corolla 

 smaller, white, segments oblong; leaves 

 acute at the base. Var. purpu'reum, co- 

 rolla purple ; segments oblong ; leaves ob- 

 tuse at the base, green on both sides. 4-20 f 



poii"ticum, (rosebay, p. ^.) leaves oblong, 

 glabrooa, both sides colored alike ; coiymba 

 terminal ; corolla bell-wheel-form ; petals 

 lanceolate. A native of Asia Minor. 



lappon"icum, (p. Ju. Tp ,) flowers in termi- 

 nal, leafy clusters, campanulate ; stamens 

 mostly 8 ; leaves elliptical, punctured, cori- 

 aceous, evergreen ; shrub 8-10 i. Whito 

 hills. 



albijlo'rum,, (w. ^ .) erect ; leaves decidu- 

 ous, lance-oval, very entire, membrana- 

 ceous, glabrous, fasciculate in the apex of 

 the branches ; peduncles fasciculate, lateral 

 and terminal ; calyx sub-foliaceous, hispid 

 corolla rotate-campanulate ; stamens 10 

 erect, equal. 2-3 f. 



puncta'tum, (r. Ju. fp.) leaves oval, lance- 

 olate, glabrous, with resinous dots beneath 

 umbels terminal; corolla funnel-form ; cap- 

 sules long. 4G f. iS. 



cataivbie)t"se, (r. J. Ip .) leaves short-oval, 

 glabrous, roundish-obtuse at each end ; 

 umbels terminal ; segments of the calyx 

 narrow-oblong ; corolla campanulate. 3-4 f 

 S. 



arbo'reum, grows about 20 feet high, 

 with immense bunches of dark scarlet oi 

 crimson velvet-like flowers. These flowers 

 secrete honey in such abundance, thai 

 when the tree is shaken, tne dropn .)f Jioaey 



i 



