246 THE DICTIONARY OF GARDENING, 
Pterocarpus—continued. 
P, flavus (yellow). A form of P. indicus. i 
P. indicus (Indian). Burmese Rosewood. fl. yellowish ; racemes 
, Simple or branched. May. Pods acutely mucronate. 
l., leaflets from five to nine, alternate, acute, glabrous. h. S0ft. 
East Indies, 1813. (B. F. S. 23.) SYN. P. dalbergioides. P. flavus 
is regarded, by Bentham, as merely a form of this species. 
P. Marsupium (pouched). A. pale yellow, disposed in terminal 
panicles, April. PE, leaflets from five to seve ternate, elliptic, 
somewhat emarginate, coriaceous, glabr h. 40ft. Coro- 
mandel, 1811. (B. F. S. 21 ; B. M. PL 81.) 
P. Rohrii (Rohr’s). M. yellow, in simple or slightly-branched, 
tomentose racemes; pedicels shorter t the calyx. April. 
Pods sub-orbiculate, about 2in. in diameter. l., leaflets very 
variable, five to nine, ovate or oblong, acuminate, glabrous, 3in. 
to Sin. long. h. 20ft, Tropical America, 1816. 
PTEROCARYA (from pieron, a wing, and caryon, a 
nut; referring to the winged fruit), Orv. Juglandee. 
A small genus (three or four species) of hardy, deciduous 
trees, natives of temperate Asia. Flowers unisexual, 
monoecious, in long, pendulous spikes. Fruit drupaceous, 
dry, angled, having two wings as the ovary, much 
tapered at the tip, not opening. Leaves ample; leaflets 
often numerous, narrow. ‘The species are seldom seen 
in gardens. They thrive best when planted near water; 
in such spots, P. frawinifolia makes one of the most 
ornamental of deciduous trees. All the species are easily 
raised from seed, imported or ripened in this country. 
P. caucasica (Caucasian). A synonym of P. fraxinifolia. 
. fraxinifolia (Ash-leaved).* Caucasian Walnut. fl. greenish. 
May. l., leaflets about — ovate-oblong, acuminate, acutely 
serrate, glabrous. h, t. Caucasus (in moist woods), 
1800. SYN. P. caucasica. 
P. rhoifolia (Rhœas-leaved). /l., female catkins sub-terminal, 
loose-flowered, equalling or exceeding the leaves. l. eight or 
nine-jugate ; leaflets sessile, rounded from the base, oblong- 
lanceolate, acuminate, argutely and densely serrulated, glabrous 
above, softly pubescent on the veins beneath, as well as on the 
petioles. Japan, (S. Z. F. J. 150.) 
P. stenoptera (narrow-winged). fi., females sessile; bracts 
minute, acute ; wings linear-oblong, attenuated at apex. l. five- 
peace mh Rigas —— odd — — elliptic 
n n at base, use a serrated on th 
ching apex, serrated on the 
US. Included under Seabiosa 
(which see). 
US. A synonym of Microstylis 
. A synonym of Calligonum 
(which see). 
(which see). 
PTERODISCUS (from pteron, a wing, and discus, 
a disk ; referring to the broad wings of the disk of the 
fruit). ORD. Pedalinee. A genus consisting of only three 
species of greenhouse, herbaceous plants, with tuberous 
roots, or with a thick, succulent stem, which becomes 
tall under cultivation; two are natives of South Africa, 
and the third is Angolan. Flowers purple or lurid- 
yellow, solitary in the axils, very shortly stalked or 
almost sessile; calyx small, — corolla tube 
gibbous at base, swollen upwards; limb somewhat bi- 
labiate, with five broadly rotundate, spreading lobes. 
Leaves opposite or alternate, narrow, toothed or cut, 
rather thick, canescent. The only species worth growing 
is P. speciosus. This is a handsome plant, and thrives 
best under the influence of a full exposure to sunlight. 
It requires a compost of sandy loam and leaf mould. 
Propagated by seeds, sown in spring and autumn; and 
by dividing the plant, in spring. P. luridus requires 
similar treatment. 
P. luridus (lurid). A. dull yellow, tubular. Jul l li . 
oblong, deeply lobed, almost pinnatifid. A. 14ft. South Africa, 
TE M, mn plant, of little horticultural value. 
P. osus (showy).* jl. of a beautiful lilac or reddish colour, 
ary, solitary, large, with a funnel-shaped tube, anda d- 
ing, five-lobed Tim. May. l. opposite, — dentate tee 
branching into several erect, thick branches’ Roots large, 
globose, tuberous, the r è 
h. ft. South Africa, 1848. PB. May ated above the earth. 
PTEROLOBIUM (from pteron, a wing, and lobos, 
a pod; the pods are produced into a wing at the ex- 
tremity). Syns. Quartinia, Reichardia. ORD. Legumi- 
nose. A genus comprising four species of tall, climbing, 
stove shrubs, armed with recurved prickles; they are 
natives of tropical Asia, Africa, and Australia. Flowers 
white (or yellowish °), small, racemose; racemes at the 
tips of the branches, loosely paniculate; calyx segments 
five, imbricated; petals five, spreading, imbricated. 
Pods sessile, compressed, samaroid, indehiscent, the apex 
produced into an oblique, oblong or falcate wing. 
Leaves bipinnate; leaflets arial, numerous; stipules small 
or inconspicuous; bracts very caducous. P. indicum— 
the only species introduced—requires ‘culture similar to 
Cesalpinia (which see). * 
P. indicum (Indian). 7. yellowish, axillary only from the extreme 
leaves, which gives them an appearance of a large, terminal, leafy 
nicle. J. alternate, abruptly bipinnate, Sin. to 6in. long, din. 
road; pinnz opposite, four to eight pairs, oval, entire, smooth, 
ee Zin. broad ; petioles armed with three prickles. East 
dies. SYN. Cesalpinia lacerans. 
PTEROLOMA. Included under 
(which see). 3 
Desmodium 
si 
PTERONEURUM (from pteron, a wing, and neuron, 
a nerve; referring to the winged placentas). ORD. Cruci- 
fere. A small genus of rock plants,: included, ye -the 
authors of the “ Genera Plantarum,” under C 
(which see for culture of the species described below).. 
P. carnosum (fleshy). jl., calyx spreading ; corolla twice as long 
as the calyx; petals white, obovate. June. l, segme! vate, 
sub-emarginate, glaucescent. h. 3in, Eastern Europe, &€., 1824. 
Hardy perennial. 
PTEROPHYLLUS. A synonym of Ginkgo (which 
see). 
PTEROPHYTON. A synonym of Actinomeris. 
PTEROPSIS. Included under Teenitis (which see). 
= PTEROSPERMUM (from pteron, a wing, and 
sperma, a seed; referring to the seeds being winged). 
Syn. Velaga. ORD. Sterculiacee. A genus comprising 
about fourteen species of stove, scaly or stellate-tomen- 
tose trees or shrubs, natives of tropical Asia. Flowers 
often elongated, sometimes several inches long; calyx 
tubular, five-cut or parted, deciduous; petals five, ob- 
ovate, oblong, or linear, deciduous; peduncles axillary, 
short, one or few-flowered. Leaves coriaceous, often 
oblique, entire or the uppermost ones angularly toothed, 
penninerved, and three to seven-nerved at the base. 
The species best known to cultivation are those described 
below. They thrive in a compost of sandy, fibry loam 
and lumpy peat; and perfect drainage is most essential. 
Propaga by cuttings of half-ripened side shoots, cut 
close to the stem, and inserted in sand, in bottom heat. 
P. acerifolium 5 . fl. white; pedicels shorter than 
the petioles. J — — —— —— ob- 
tuse, with a short acumen, toothed, tomentose beneath, ppor 
surface white, clothed with te hairs. East Indies, 1790. A 
——— This species thrives well under greenhouse treatment. 
P, suberifolium (Cork-tree-leaved). fl. white, axillary, solitary, 
twin or tern at the tops of the branches; pedicels hardly the 
length of the petioles, crowded. l. Sry acuminate, obliquely 
cordate at the base, coarsely toothed at the apex, tomentose 
beneath. East Indies, 1783. A small tree. (B. M.T 
Pentapetes suberifolia. 
PTEROSTELMA. 
see). : 
PTEROSTYLIS (from pteron, a wing, and stylis, & 
column; alluding to the broadly-winged column). SYN. 
Diplodium. ORD. Orchidew. A genus comprising about 
three dozen spegies of greenhouse, terrestrial orchids, 
with small, underground tubers; six are confined to New 
Zealand, and the rest are all Australian, one being al 
found in New Zealand and another in New Caledonia. 
Flowers usually green, often tinged or streaked with 
red or brown, large and solitary, or smaller and race- 
mose, on short pedicels; dorsal sepal broad, erect, 1m- 
Included under Hoya (whieh 
— 
(B. M. 1526.) SYN.. 
