302 
Rhynchoglossum—continued, 
racemes terminal, or at length oPPosjte the leaves, 
secund, loose. Leaves alternate, #™ple, membranous, 
very unequilateral. R. zeylanicum is & pretty annual, or 
at most biennial, requiring culture Similar to Klugia 
(which see), 
R. zeylanicum (Cingalese). in ] terminal, sometimes 
— pom ana leafy, Baseni tee blue, p: i and 
almost white beneath, with a little yefloW- July. l. alternate, 
petiolate, somewhat ovate, one closely Penninerved. R, about 
lft. Ceylon, 1844. (B. M. 4198. 
RHYNCHOPETALUM. Included under Lobelia 
(which see). 
RHYNCHOSIA (from rhynchos, a peak; alluding 
to the shape of the keel). ORD. Leg’minose. A genus 
comprising about seventy-five species Of stove or green- 
house, twining, prostrate, or rarely eTect herbs, shrubs, 
or sub-shrubs, inhabiting warm regions. Flowers yellow, 
the standard often darkly lined, Tarely purple, in 
axillary racemes, rarely solitary in the axils; two upper 
calyx lobes more or less connate; standard obovate or 
orbicular, spreading or reflexed; keel jnourved at the 
apex. Leaves pinnately, or rarely SUb.digitately, tri- 
foliolate, exstipellate or minutely Stipellate; leaflets 
resinous-dotted beneath. The Species are of no great 
beauty; only four call for mention here, They thrive 
in a light, sandy soil, and may be proPagated by seeds. 
Chrysoscias i . en-yellow 01 ; 
— ample; —— E Pa ay Pet at the — 
May. l. on very short petioles ; leaflets 14in- long, oblong-lanceo- 
late, with revolute margins, dark-coloured pove, fulvescent 
beneath. South Africa, 1871. Climbing, Z"eenhouse sub-shrub, 
— a Mie younger portions with g°ld oy tawny hairs. 
R. cyanosperma (blue-seeded). Jl., corolla bright red-purple, 
equalling the calyx. Summer. ` l, leaflets — leathery ; 
central one roundish, 4in. ‘to Sin. long. cuspidate, With a 
petiolule tin. long; lateral ones unequal-Sideg ; up T Surface 
— lower densely, grey-pubescent, Tall, shrubby climper. 
opics. 
R. c. albiflora (white-flowered). A. yellOWish-white. April. 
i. acuminate, with a very long acumen, Climping, stove sub- 
shrub, (B. M. 1859, under name of Cyijsta Glpiflora.) 
_ R. gibba (tumid). A. standard ovate, streaked with brown; 
uncles šin. to fe. long, fioriferous Aboye the middle. 
September and October. J. on rather jong oles; leaflets 
variable, sometimes almost orbicular anq vety obtuse, sometimes 
rhomboid, acuminate, the lateral ones ver Unequal-sided, tin, to 
lsin. long and broad. Stems climbing or iling densely Pubes- 
cent. South Africa. Greenhouse shrub, (B- R275, under name 
of Glycine caribæa.) 
R. phaseoloides (Phaseolus-like). M. standard striped with 
purple; racemes many-flowered. June and July. Z, leagets 
ovate or ovate-rhomboid, pointed. Stem sUffryticose, twining, 
sub-cylindrical. West Indies, 1818. Stoye. (B, M. + Under 
Saio of Glycine phaseoloides.) tj a — 
RHYNCHOSPERMUM (of Lindley), A synonym 
of Trachelospermum (which see). 
RHYNCHOSTYLIS (from rhynchos, a beak, and 
stulos, a pillar; alluding to the shape of the column). 
ORD. Orchidew. A small genus (two or three species) of 
stove, epiphytal orchids, natives of the t Indies and 
the Malayan Archipelago. Flowers TAther large or 
mediocre, shortly pedicellate; latera] sepals proader than 
the dorsal one; lip affixed to the column, profoundly 
saceate at base, with obsolete, lateral lobes; column 
short, thick; racemes lateral, long, dense-flowered. 
Leaves distichous, coriaceous or fleshy, fat; sheaths 
persistent, concealing the stem. For qulttre of R. retusa, 
the best-known species, see Saccolapinm, 
R. retusa (retuse).* ^. white, stri Violet-pink ; 
half as wide as the ovate wr rg tiga grr — 
ical spur, the ina J@Nnceolate, inflexed, 
i i. 1ft. long, 
cal 
channelled, ually truncate. East Indies, 1820. A Pretty 
ies, SYNS. Saceclabium Blumei (Lg, O. S. guttat 
B M. 4108), Sarcanthus guttatus (B. È Siga). — 
RHYNCHOTECHUM (name not explained by its 
author). Syns. Cheilosandra, Chiliandra, Corysanthera, 
ORD. Gesneracee. A genus comprising aboyt half-a-dozen 
THE DICTIONARY OF GARDENING, 
BRhynchotechum—continued. 
species of villous, hairy, or woolly, stove sub-shrubs, 
natives of the East Indies and the Malayan Archipelago. 
Flowers pink or white, small; calyx of five narrow seg- 
ments; corolla with a short, broadly campanulate tube, 
and a sub-bilabiate limb; cymes pedunculate in the axils 
or defoliated nodes, often bundle-flowered, densely or 
loosely trichotomous, Leaves ample, opposite or rarely 
ternately whorled. Only one species has yet been intro- 
duced. For culture, see Gesnera. 
R. ellipticum (elliptic-leaved). ñ. of a deep rose-colour, small, 
disposed in crowded, axi corymbs. Summer. J. opposite, 
obovate-elliptic. Stem simple, erect, 2ft. to 3ft. high. Assam and 
Sikkim, 1870. (B. M, 5832.) 
RHYNCOPERA. Included under Pleurothallis. 
RHYSOSPERMUM. A synonym of Notelea 
(which see). 
RHYTIDANDRA. A synonym of Marlea (which 
see). 
RHYTIDOPHYLLUM (from rhytis, rhytidos, a 
wrinkle, and phyllon, a leaf; alluding to the rugose 
leaves). ORD. Gesneraceœ. A genus comprising about 
ten species of villous or white-woolly, rarely almost 
glabrous, stove shrubs or small trees, natives of the 
West Indies and Columbia. Flowers often softly vil- 
lous or woolly ; calyx tube adnate, turbinate, or nearly 
hemispherical; corolla usually greenish outside, variously 
coloured within; tube incurved, enlarged above; limb 
of short, broad, erecto-patent lobes; peduncles axillary, 
elongated, cymosely many-flowered. Leaves alternate, 
shortly petiolate, often elongated, entire or crenate, 
softly rugose or Scabrous, sometimes very scabrous and 
woolly beneath. Only two species have been introduced. 
For culture, see Gesnera. 
R. auriculatum (eared). M. greenish, red-spotted within ; 
corolla sub-campanulate, hairy ; peduncles almost equalling the 
leaves, glandular-tomentose. August. J. sessile, narrowed at 
base and auriculate, dilated and semi-amplexicaul, serrated, 
tomentose - scabrous above, slightly hoary beneath. A. lft. 
Brazil, 1824. (B. M. 3562.) : 
R. tomentosum (tomentose). E corolla greenish-yellow, varie- 
gated With purple spots, or p , Zin. long, scabrous-tomentose ; 
peduncles ing or exceeding the leaves. Summer. J. lan- 
ceolate or oblong-lanceolate, 4in. to 8in. long, acuminate, serrate, 
scabrous above, villous beneath. h. 2ft. to 3ft. West Indies. 
(B. M. 1023, under name of Gesneria tomentosa). 
RHYTIGLOSSA. A synonym of Dianthera. 
RHYTISMA. A genus of Fungi which make their 
appearance upon the leaves and branches of Maples, 
certain Willows, and a few other plants, in the form of 
shining, deep black patches, rising a little above the 
general level of the part bearing them. The most gene- 
rally known species is that which gives rise to the large 
black spots so common in autumn upon the leaves of Acer 
campestre, or Field Maple, and of Acer Pseudo-platanus, 
the Sycamore of England, the Plane of Scotland. These 
spots, in their common form, are often din. or more in 
breadth, and are of a uniform tint. The Fungus is 
known as R. acerinum, A variety called R. punctatum 
differs from this in haying the spots. broken up into a 
number of small black specks instead of a uniform black 
patch. In autumn, there is no sign of reproductive 
organs On the Fungus; but if a patch is examined in 
spring, after the leaf has lain on the moist ground all 
winter, there are found imbedded in the mass nume- 
rous asci, each inclosing eight slender spores. 
The remedy is easy, and consists in the careful re- 
moval of the diseased leaves, as is done in well-kept 
gardens and pleasure-grounds. In such places, this 
disease is of rare occurrence compared with its abundance 
in most Other localities, Its presence renders the leaves 
unsightly, but is not dangerous to them. 
RIB. A primary and strong vein, or conspicuous 
portion of the framework, of a leaf. 
