2930 



RHIPSALIS 



RHODODENDRON 



2-4 short bristles, which on the end branches project as 

 a little brush: fls. near the tops of the short branches, 

 flat, %in. diam., with 12 white Ivs. with yellowish mid- 

 stripe: berry white. Uruguay and Argentina. B.M. 

 4039. 



5. mesembrianthemoides, Haw. (Haridta mesem- 

 brianthemoides, Lem.). Upright, the ends drooping, 

 richly branched : long branches 4-8 in. long, 1 line diam. ; 

 fruiting branches 3-5 lines long, not more than 2 lines 

 diam., spirally attached, thickly crowded: areoles 

 sparsely woolly, with 1-2 bristles which project from 

 the ends of the branches: fls. near the top of the joint, 

 about 5 lines diam., formed of 10 white with yellow 

 midstriped Ivs.: berry white. Brazil. B.M. 3078. 

 Probably hardly more than a slender variety of the 

 preceding species. 



6. gracilis, N. E. Br. Branches terete, slender: fls. 

 either terminal or lateral, minute. Passing in collec- 

 tions under the name of R. penduliflora. 



DD. The branches all alike. 



7. grandifldra, Haw. (R. funalis, Salm-Dyck). 

 Branching, cylindrical, rather stout, the branches reach- 

 ing a height of 3 ft., with a diam. of more than J^in.; 

 ultimate branchlets short, often verticillate : areoles 

 depressed, bordered by a red line, sometimes in old 

 branches bearing a bristle: fls. wheel-shaped, lateral on 

 the branches, nearly 1 in. diam. Brazil. B.M. 2740. 



8. Cassytha, Gaertn. Richly branching, pendulous, 

 sometimes 10 ft. long; branches raraly 2 ft. long, 1-1 K 

 lines diam., pale green; ultimate branchlets spirally 

 attached: areqles with sparse woolly hairs and fre- 

 quently 1-2 minute bristles: fls. lateral on the terminal 

 joints, 2-3 lines diam.: berry like that of the mistle- 

 toe, 1-2 lines diam. Widely dispersed in Cent, and S. 

 Amer., W. Indies, Mex., Mauritius, Ceylon, and Afr. 

 B.M. 3080. 



9. virgata, Web. Richly branching, pendulous, be- 

 coming a yard long; terminal branchlets hardly more 

 than a line thick, spirally attached: areoles bearing 

 sparse woolly hairs, with an occasional bristle: fls. lat- 

 eral, 3-4 lines diam. : berry only 1 ^ lines diam. Brazil. 

 Very much like the preceding. 



cc. Branches not terete. 

 D. The branches narrow, angled. 



10. trigona, Pfeiff. Richly branched, becoming a 

 yard long: branches Yi to nearly 1 in. diam., 3-angled: 

 areoles sparsely woolly and bristly, the blooming 

 areoles much more copiously so: fls. greenish outside, 

 white within, 4 or 5 lines long. Brazil. 



11. paradoxa, Salm-Dyck. Sparingly branched, 1-2 

 ft. long; branchlets 1-2 in. long and Yz-\ in. diam., 

 twisted at the joints, so that the angles alternate with 

 the sides: fls. %in. long, white. Brazil. 



12. pentaptera, Pfeiff. Richly branched, 1-2 ft, long, 

 4-5 lines diam.: branchlets 2-5 in. long, 5-6-angled or 

 almost winged: areoles in crenatures of the angles with 

 scanty wool and an occasional bristle: fls. greenish 

 white, 3-4 lines long: fr. white, bright rose-red above, 

 crowned by the withered fl. S. Brazil, Uruguay, 

 Argentina. 



13. rosea, Lagerheim. Shrubby, more or less erect, 

 usually 10 in. high: branches clustered, often hanging, 

 3-4-angled: fls. rare, large, \Y 2 in. broad, rose-colored, 

 fragrant. Brazil. 



DD. The branches usually fiat or 3-angkd, always broad. 



14. rh6mbea, Pfeiff. (R. Swartziana?, Pfeiff.). 

 Branching, reaching a yard in length: joints green, lf.- 

 like, crenate-oblong or rhombic, 1-5 in. long, J^-2 in. 

 broad: fls. yellow, about 5 lines long. Brazil. 



15. pachyptera, Pfeiff. (R. alata, Steud.). Erect, 

 branching, reaching a height of nearly 3 ft.: joints 

 flat, rarely 3-winged, rather thick, usually somewhat 



concavo-convex, 3-8 in. long, blunt, 2-5 in. broad, often 

 purple-red: fls. about 8 lines long, yellow with reddish 

 tips. Brazil. B.M. 2820 (as Cactus alatus). 



16. Houlletiana, Lem. (R. Houlletii, Lem.). St. 

 richly branched, becoming 3 ft. or more long, 1-1 J^ in. 

 broad, often tapering to the round midrib for a con- 

 siderable distance, then becoming again broad and lf.- 

 like: fls. 8-9 lines long, yellowish white to yellow: berry 

 red. Brazil. B.M. 6089. 



R. angustissima, Web., R. chlordplera, Web., R. N'ovxsii, Lof- 

 gren, R. Simmleri, Beauverd, and R. Wercklei, Berger, are recent 

 species occasionally seen in European collections, but not offered 



J. N. ROSE. 



RHIZOPHORA (Greek, root and bearing, referring 

 to the fact that the seeds germinate even while attached 

 to the plant if they touch the ground). Rhizophoracest >.. 

 Trees, with thick terete scarred branches, sometimes 

 planted to hold seashores: Ivs. opposite, petioled, thick, 

 leathery, ovate or elliptic, entire, glabrous: peduncles 

 axillary, di- or trichotomously branched, few-fld.: fls. 

 rather large, leathery, sessile or pedicelled; calyx-limb 

 4-parted; petals 4; stamens 8-12; ovary semi-inferior, 

 2-celled: fr. leathery, ovoid or obconical, 1-celled, 1- 

 seeded. About 3 species, seashores of the tropics. R. 

 Mangle, Linn. Shrub or tree reaching a height of 30 

 ft.: Ivs. 2-6 in. long, leathery, elliptic or elliptic-obo- 

 vate, obtuse: peduncles 2-3-fld.; fls. pale yellow; sepals 

 lanceolate; petals linear, or nearly so, leathery, cleft 

 at tip. Coast of Fla. and the tropics. It forms impene- 

 trable thickets. 



RHODANTHE: Helipterum. 



RHOD AZALEA: a name given in France to a hybrid 

 (R. Croftxii, Hort.) between a garden rhododendron 

 and Azalea mollis (Rhododendron sinense). Another 

 name for this hybrid is Azaleodendron Crouxii, Hort. 



RH6DEA: Rohdea. 



RHODOCHITON (Greek, red cloak; alluding to the 

 large rosy red calyx). Scrophularidcese. A free-flower- 

 ing graceful vine with Ivs. cordate, acuminate, sparsely 

 and acutely dentate: fls. solitary, pendulous, axillary, 

 long-peduncled; calyx conspicuous, large, membranous, 

 broad bell-shaped, 5-cleft; corolla-tube cylindrical, the 

 throat not personate, 5-lobed; lobes oblong, nearly 

 equal: caps, dehiscent by irregular perforations. One 

 species, Mex. 



volftbile, Zucc. PURPLE BELLS. A vine with habit of 

 maurandia, to which it is allied, but more vigorous and 

 having curious, distinct purplish red fls. over 2 in. long 

 on red peduncles: Ivs. about 3 in. long. B.M. 3367. 

 B.R. 1755. G.C. III. 53:310. G.M. 58:376. Gn.W. 

 12:449. I.H. 42:31. J.H. III. 43:563. R.H. 1910, p. 

 79. Blooms the first season from seed and may be 

 treated as a tender annual. p\ \y. BARCLAY. 



RHODODENDRON (Greek, rhodon and dendron, 

 rose-tree; the Rhododendron of the ancient writers is 

 Nerium). Ericaceae. Including Azalea which most bot- 

 anists consider inseparable from Rhododendron, but 

 horticulturists may be inclined to retain Azalea for the 

 deciduous species and to use the Azalea names given in 

 parentheses. Highly ornamental woody plants, chiefly 

 grown for their beautiful flowers and many species also 

 for their handsome foliage. 



Evergreen or deciduous shrubs, rarely trees: Ivs. 

 alternate, short-petioled, entire: fls. pedicelled, in 

 terminal umbel-like racemes, rarely lateral, in 1- to few- 

 fld. clusters; calyx 5-parted, often very small; corolla 

 rotate, campanulate or funnel-shaped, sometimes tubu- 

 lar, with 5-, sometimes 6-10-lobed limb; stamens 5-10, 

 sometimes more; anthers opening with pores at the apex; 

 ovary 5-10-loculed ; style slender with capitate stigma: 

 caps, separating into 5-10 valves containing numerous 



