AN ENCYCLOPAEDIA 
OF HORTICULTURE. 85 
PETROPHILA (from petros, a rock or stone, and 
phileo, to love; in allusion to the place of growth). 
Orv. Proteacew. A genus comprising thirty-five species 
of Australian, greenhouse shrubs. Flowers usually white 
or yellow, in dense, terminal or rarely axillary spikes or 
cones; perianth tube slender, separating into four seg- 
ments from the base, or remaining united, the limb of 
four linear lamine. Fruit a small, sometimes winged 
nut. Leaves scattered, rigid, entire or divided, frequently 
terete or narrow. It is doubtful if even the few species 
here described are still in cultivation. For culture, see 
Banksia. è 
P. acicularis (needle-shaped).* fl. white, red; cones terminal 
and sessile, nearly globular, about zin. in diameter. May. J. un- 
divided, usually slender, terete, and more or less distinctly 
grooved on the upper side, obtuse, or with a short, straight, 
curved point. R. ft. 1830. (B. M. 3469.) 
P. glanduligera (gland-bearing). A synonym of P. Serruriæ. 
P. heterophylla (variable-leaved). white; cones all axillary, 
sessile, ovoid-oblong, the old ones zin. long. June. J. linear or 
linear-lanceolate, 2in. to 4in. long, more or less flattened, entire 
and acute or dilated towards the end, and then often truncate or 
notched, with a small point in the notch, or deeply divided into 
two or three iobes. R. Aft. 1840. 
P. pulchella (pretty). fl. white; cones terminal, sessile, solitary 
or with one or two axillary ones close below, oblong or 
cylindrical, lin. to l}in. long. July. 1. Lin. to 2sin. long, twice 
or thrice pinnate; segments numerous, not spreading, terete, 
grooved above, rather slender, not pungent. h. 6ft. to 8ft. 1840. 
(B. M. 796, under name of Protea pulchella.) . 
P. rigida (rigid). fl. white; perianth nearly zin. long ; cones ter- 
minal or in the 10150 of the branches, sessile, nearly globular. 
May. 1. very rigid, trichotomously bipinnate; ultimate segments 
sometimes zin. to lin. long, all terete, divaricate, and pungent- 
pointed, A. 2ft. to 3ft. 1823. A rigid shrub. 
P. Serrurie (Serruria-like). Jl. white; perianth be gare with 
small, stipitate glands ; cones ovoid or at length conical, sessile or 
shortly pedunculate in the upper axils, often crowded in termiñal 
clusters. May. Z. rarely above lin, long and broad, crowded, 
twice or thrice-pinnate, with the lower segments close to the 
; segments numerous, slender, terete, grooved above. h. 3ft. 
to Aft. 1840. SYN. P. glanduligera. 
PETROPHYES. A synonym of Monanthes 
(which see). . 
PETTERIA (named in honour of Franz Petter, who 
wrote an account of a botanical tour in Dalmatia in 
1832). ORD. Leguwminose. A monotypic genus. The 
Species is a hardy, erect shrub, requiring culture similar 
to Cytisus (which see). 
ramentacea 
pedunculate, P idal, erect racemes; calyx campanulate, 
the lobes tomentose-ciliate, obtuse; corolla 
name of Cytisus Weldenii.) 3 
 PETTIGREE, or PETTIGRUE. See Ruscus 
aculeatus. ; 
PETTYWHIN. A common name for Genista anglica _ 
and Ononis arvensis. 
PETUNGA (Peetwnga is the Bengalese name of 
P. Rorburghii). Syns. Higginsia (of Blume), Spicillaria. 
ORD. Rubiacee. A genus consisting of four or five species 
of glabrous, stove shrubs, with terete, twiggy branchlets, 
natives of Eastern Bengal, the Malay Peninsula, and 
the islands of the Indian Archipelago. Flowers white, 
small, disposed in short, axillary, simple or somewhat 
compound spikes, sessile or shortly pedicellate, bibracteo- 
late; calyx persistent, tube ovoid, limb four-toothed; 
corolla funnel-shaped, with a short tube, a very villous 
throat, and four spreading, oblong lobes. Leaves oppo- 
Site, petiolate, oblong or lanceolate, narrowed to both 
ends. P. Roxburghii is an ornamental shrub, requiring 
culture similar to that recommended for Catesbæa 
(which see). 
P, Roxburghii (Roxburgh’s). ji. small; spikes about one-half or 
— = oriek ihan the Heves; bracts agea pou 
-L c-oblong, glabrous, drooping, r 
about lin. broad; pg tte eg h. 3it. to 8ft. India, 
| P. intermedia (intermediate). fl. axillary or 
(from petun, the Brazilian name of 
PETUNIA 4 
tobacco; alluding to the affinity of this genus with Nico- 
tiana). ORD. Solanaceew. A genus comprising about a 
dozen species of highly ornamental, hardy or half-hardy, 
annual or perennial herbs, often viscid-pubescent, branched ; 
they inhabit Braziland the Argentine Republic, one being 
broadly dispersed from Western South America to Brazil. 
Flowers violet or white, sometimes showy, sometimes 
small, on solitary pedicels; calyx deeply five-fid or nearly 
five-parted; corolla funnel or salver-shaped, the tube 
cylindrical, or swollen above; limb plicate, equal or 
oblique-spreading, the lobes short, broad, and loosely 
bilabiate and imbricating at the apex; stamens five, affixed 
below or at the middle of the tube. Leaves entire, usually 
small. 
Petunias are very showy and popular plants, effective 
when grown in pots, and also in summer flower beds 
outside. P. nyctaginiflora and P. violacea are species 
from which the numerous garden varieties are supposed 
to have been obtained; as they were not introduced 
until early in the present century, the cultivation of the 
plant under notice does not extend any further back, 
For a long period, considerable attention was paid by 
florists to the improvement of Petunias, and excellent 
results were obtained. Less has been done of late years 
in selecting and naming varieties; still, the plant is far 
from being allowed to fall into neglect. In some parts, 
particularly in the West of England, it is most success- 
fully cultivated for exhibition. 
Petunias may be raised in any quantity from seeds, 
and named kinds readily propagated from cuttings. 
Seeds, which are very minute, should be sown, during 
March, in pans of light, finely-sifted soil, very slightly 
covered, and placed in a gentle warmth. They usually 
vegetate in a very short time, and, before the seedlings 
become crowded, they should be carefully pricked off in 
other pans or pots. Afterwards, when large enough, pot 
them off singly, pinch out the points before they get 
very high, to induce a compact habit, and keep growing 
on in an intermediate house, or a low pit. Early in 
May, those intended for planting out should be gradually 
inured to the open air, and others, retained for flowering 
inside, should receive the final potting, and be kept in 
frames where plenty of air can be admitted. The plants 
flower profusely at the latter part of summer and in 
autumn, when they prove very useful and effective for 
greenhouse decoration. Plants for providing cuttings in 
spring should be preserved through the winter in a 
warm greenhouse. 
some cuttings, in autumn, for the purpose. 
root readily in a close frame, during February and 
March, and plants thus obtained may be grown on with | 
little trouble. Petunias succeed best in a compost of 
about two parts loam to one of manure. They require 
plenty of water all through the summer. Slender stakes 
are necessary, to keep the plants from falling about. 
The three species known in gardens are described 
below. 
P. acuminata (taper-pointed). A synonym of Nicotiana acumi- 
nata. 
posite the 
leaves; corolla zin. long and broad, pubescent-glandular without; 
tube yellow-striated, longer than the calyx; limb large, purple, 
with a paler margin; peduncles żin. to lin. long, filiform. August. 
l E obtuse, attenuated at 5 
E 1 -hardy perennial, at length 
in. long. 
A. lft. Buenos Ayres, 1832. i a i le! 
becomi -shrubby. (B. R. 1931.) SYNS. Vierembergid inter- 
SeNi A B. RETES B. F. G. ser. ii. 237), Salpiglossis 
linearis (B. 3256). 
(N ETEN A P 
large, the tube cyli 
; limb ve reading. August. l, cauline ones solitary, 
— obl i tly obtuse, — or quite sessile ; floral ones 
ile, co vate, twin, y opposite. h. 2ft. South 
ica, 1823. A diff vill 
) 
America, illous-glandular, half-hardy 
See Fig. 93. (B. M. 2652; P. M. B. ii. 173; S. B. F. G. 
They may be obtained by striking 
Young shoots 
