1900 SUPPLEMENT—RECENT INTRODUCTIONS, &C. 635 
RHAZYA (from the Arabic name). Orb. Apocynacece. 
A small genus (two species) of hardy, glabrous, erect 
shrubs or under-shrubs, closely allied to Vinca, natives 
of Greece, Western Asia, and Arabia. Flowers densely 
eymose, corymbose, or somewhat thyrsoid at the tips of 
the branches. Leaves alternate, rather thick. One species 
has been introduced. It requires similar treatment to 
the hardy species of Vinea (which see). 
R. orientalis (Oriental). fl. varying from bright blue to dark 
violet ; corolla seven lines long; cyme terminal, not exserted 
from the uppermost leaves. Summer. /. 2in. long, membranous, 
shining, ovate-lanceolate, acuminate, sub-s >, Br: 
simple, short, erect, thickly leafy. Orient, 1889. (R. 
t. 1345.) 
RHEUM. To the species described on p. 288, 
Vol. III., the following should be added : 
R. australe is regarded by Sir J. D. Hooker as_ probably 
synonymous with R. Emodi. 
R. Collinianum (Collin’s). . crimson, in spikes 5ft. to 6ft. 
high. June and July. China. 
R. compactum (compact). #. white and green; panicle 
branches nodding (erect in fruit). M l. broadly ovate, 
rather thick, obsoletely undulated or , Seven-nerved, very 
obtuse, highly glabrous above, slightly pilose beneath. Stems 
tall, suleate. Siberia, &c., 1758. Syn. R. nutans. 
R. hybridum Florentini (florentin’s hybrid). 
hybrid. between R. Collinianum and R. oficinale. 
A garden 
It has an 
inflorescence 6ft. to 9ft. high, the flowers being excessively 
numerous. 1899. 
R. Moorcroftianum (Moorcroft’s).* fl. bright r 
in a dense, pyramidal inflorescence less than 2ft. hi 
pubescent. 2. oblique, nearly brous. Kumaon, 185 
decorative, probably hardy species. (G. C. 1895, xvii. 
f. 115.) 
R. nutans (nodding). A synonym of R. compactum. 
R. palmatum tanghuticum.* This differs from the type in 
having much longer and more deeply-lobed leaves. It makes 
an excellent lawn plant. 
R. Ribes (Ribes-like). #1. white and green; pedicels fascicled. 
May. i. glaucescent, coriaceous, sub-cordate-orbicular or 
reniform, 4in. to 12in. long, 6in. to 2ft. broad, minutely 
denticulate, often papillose-scabrid beneath. Stems tall, thick, 
leafy below, leatiess above and forming a large, much-branched, 
fastigiate panicle. Orient, 1724. This is unfortunately not 
hardy. (B. M. 7591.) 
RHEXIA. Several species formerly included here- 
under are now referred to Tibouchina. R. Acisanthera is 
synonymous with Acisanthera quadrata (which see). 
RHINACTINA. A synonym of Jungia (which see). 
RHINCHOGLOSSUM. See Rhynchoglossum. 
RHIPSALIS. Mistletoe Cactus. To the species and 
varieties described on p. 290, Vol. III., the following should 
be added. Several others have lately been introduced, but 
are chiefly of botanical interest, the flowers being mostly 
small and unattractive. Sixteen new species and varieties 
1, disposed 
racemes 
A very 
, p. 765, 
were described in the ‘‘Reyne Horticole’? in 1892, but 
they do not appear to be in general cultivation. Some 
of them, however, are listed by German specialists in 
Cactaceous plants. Rhipsalis species succeed best when 
grown in a moist stove. 
R. aculeata (prickly). 7. whitish, small. jr. dark wine-red. 
Stems cylindrical, trailing, slightly eight- to ten-angled, and 
clothed with tufts of slender white spines. Argentina, 1892 
R. cavernosa (cavernous). This is something in the way of 
R. communis, but has flat (mot th ngled), toothed stems, 
ixils of the teeth having a large cavity tilled with woolly 
South Brazil, &c., 1890. There are also white and pink 
yarieties of this. Syn. Lepismium cavernosum (R. G. 1890, 
p. 151, f. 38). 
R. cristatum purpureum (purple). 
broader joints, bronzy-purple in colour. 
R. dissimilis (unlike), Stems stout, cylindrical, jointed, some 
of them smooth, while others are covered with tufts of 
bristles about din. long. South Brazil, 1890. Syn. Lepismium 
dissimile (R. G. 1890, p. 148, f. 36-7; 1891, p. 634, f. 21). The 
form setulosa has five-angled stems. 
R. floccosa (woolly). Stems as in R. Cassytha (of which this 
is probably a variety), but thicker, long and with the 
branchlets in compact clusters on the ends of the long, 
arching branches. Warm-house. 
R. hadrosoma (thick-bodied). 1. white, hyaline. 
drical, bright green. Brazil, 1897. 
R. Knightii (Knight's). 1. white, small. Stems and joints as 
in R. communis; wings of joints usually broad, with red 
margins, the hair in the notches in a dense tuft nearly lin. 
long, pure white, silk-like. A. lft. Brazil. A straggling 
species. Syns. Cereus Knightii, Lepismium Knightii. 
A variety with larger, 
Stems cylin- 
Rhipsalis—continued. 
R. Mittleri (Mittler’s), The correct 
R. Myosurus (mouse-tail).* fl. yellow, tinged with red, small, 
borne from the notches. July. Stems dependent, several feet 
long, branching freely, jointed, with three or four wings or 
angles; angles reddish, notched, with tufts of white hairs 
between the notches. Brazil, 1839. Warm-house. Syn. Lepis- 
mium Myosurus. 
R. pendulifiora laxa (loose). A variety 
curving and more pendulous than in the type. 
R. pulvinigera (cushion-bearing). 7. 
Branches dark 
name of R. communis. 
having branches 
white and yellowish 
having the 
areole 
green. green, terete, in 
regular spirals, and bearing small, roun¢ rudimentary 
leaves or scales of a reddish-brown. Brazil, Sinilar to 
R. floccosa. (R. G. 1889, p. 182, f. 33, 34.) 
R. Regnelli (Regnell’s). #. white, small. Branches broad, 
flat, coarsely toothed. South Brazil, 1890. Similar to 
R. Houlletii. (R. G. 1890, p. 118, f. 29, 31-3.) 
R. salicornoides stricta (erect). 
Joints all pointing up- 
wards. 
Plant much more compact than the type. 
Fic. 646. 
RHIPSALIS SARMENTACEA. 
R. sarmentacea. This species (described in Vol. IIT.) should 
be grown in a ket of peat-tibre, or, better still, on a 
piece of soft Fern-stem. See Fig. 646, for which we are 
indebted to the Gardeners’ Chronicle. 
R. trigona (three-angled). fl. white, small, borne in the 
notches of the angles. Spring. jr. white. Branches usually 
in forks, jin. in diameter, three-angled; angles wavy or 
slightly notched, greyish-green. Brazil. A thin, straggling, 
stove species. 
