590 
THE DICTIONARY OF GARDENING, 
Pereskia—continued. 
i. ample, ovate, acute, caducous, each having a large axillary 
prickle. Stem and branches cylindrical. Mexico, 
P. spathulata (spatula-like). fl. red. JU. spathulate, thick, 
green, 24in. long. Trunk ascending, slender, at length woody ; 
areole remote, tomentose, the young ones woolly; prickles 
one or two, rigid, whitish. Mexico. 
P. subulata (awl-like). 7. subulate, slightly channelled, Sin. 
to 6in. long. Stem fleshy, several yards in height and 2in. 
in diameter, naked at apex; areola prominent. Valparaiso. 
Fic. 624. 
PERESKIA ZINNIZELORA, 
P. zinnizflora (Zinnia-flowered).* jl. rosy-red, terminal on the 
ripened young shoots, and composed of a whorl of broad, 
overlapping petals, nearly 2in. across, with a _ cluster of 
stamens in the centre. Stem erect, woody, branching freely ; 
branches bearing oval, acuminate, fleshy, wavy-edged, green 
leaves, with short petioles, and a pair of spines in the axil 
of each; spine cushions on old stems crowded with stout, 
brown spines. Mexico. A well-marked species, in the way of 
P. Bleo. See Fig. 624. 
PEREZIA. To the species described on p. 76, 
Vol. III., the following should be added : 
P. multiflora (many-flowered). (jl.-keads bluish, terminal, 
corymbosely clustered ; involucral scales in two or three series, 
the outer ones mucronate; pappus somewhat reddish. 
7. amplexicaul, oblong, sinuate-toothed. Stems erect. Brazil. 
Annual, rN. Homoiantius multiflorus. 
P. sonchifolia (Sonchus-leaved).* /l.-heads white, somewhat 
resembling a miniature double Camellia; florets all ligulate, 
imbricated. l. Thistle-like; radical ones elongated, cut; 
cauline ones much smaller, alternate, sessile. Stems erect, 
simple and branched. Uruguay, 1895. A pretty annual, 
(R. H. 1836, p. 134.) 
PERFORATE. Pierced with small, round holes. 
PERGULARIA. P. sanguinolenta is now considered 
to be a species of Crypfolepis, a genus not otherwise 
represented in gardens. 
PERICOME (from peri, around, and kome, a_ tuft 
of hairs; there is a tuft of long hairs all around the 
margin of the achenes). Orp. Composite. A small 
genus (two species) of half-hardy, shrubby perennials, 
natives of the Mexican region, and closely allied to 
Palafoxia (which see for culture). Flower-heads 
erowded and corymbose or loosely paniculate, hetero- 
gamons, radiate; involucre campanulate, the bracts in 
Pericome—continued. 
one series. Leaves opposite or the upper ones alternate, 
petiolate, acuminate. Only one species has been 
introduced. 
P. caudata (tailed). /.-heads golden-yellow, 4in. or less in 
height, numerous in terminal, corymbiform cymes. J. long- 
petiolate, triangular-hastate, 2in. to 5in. long, with sparingly 
crenate-toothed or entire margins. h. 3ft. to 4ft. Colorado, 
1896. Plant strongly scented, widely branching. 
» 
PERIDERMIUM STROBI. This fungus is 
responsible for the Bladder Rust, or Weymouth Pine 
Rust (which see). It is also found upon Pinus Cembra 
and P. Lambertiana. It is hetercecions, the other stage 
being passed upon Currants, when it is known as 
Cronartium ribicolum. 
PERIGYNOUS. This term is also used to indicate 
stamens that adhere to the calyx but are free of the 
ovary. 
PERILLA. To the species, &c., described on p. 78, 
Vol. III., the following variety should be added: 
P. arguta atropurpurea (sharp, dark purple). A synonym 
of P. ocimoides crispa. 
P. ocimoides rosea (pink). J. variegated with red, pink, 
light green, and whitish. 1897. Syn. P. nankinensis rosea. 
PERIPLOCA. Campelepis is synonymous with this 
genus, which now embraces abont sixteen species. 
PERISPORACEI. See Pyrenomycetes. 
PERISTERIA. Syn. Eckardia. To the species 
dexeriped on p. 79, Vol. III., the following should be 
added : 
P. aspersa (bestrewn). jl. large, about ten in a_ short 
raceme; sepals and petals yellowish-brown, covered with 
brownish-red dots; front of the lip dark crimson. Pseudo- 
bulbs 44in. high and more than 7in. in diameter. Venezuela, 
1891. (L. vi., t. 267.) 
P. Ephippium. J. having broadly-linear fleshy arms to the 
column, and a rhomboid three-lobed epichil to the lip; callus 
broad, ribbed and furrowed, the ribs meeting and prolonged 
in a thick line to the apex of the mid-lobe. Andes (?), 1883. 
Allied to P. pendula. 
P. leta (pleasing). #. bright yellow, somewhat resembling 
those of P. cerina; sepals and petals spotted dark purple, the 
former oblong, the latter cuneate-rhomboid; lip with smaller 
spots than those on the sepals and petals; bracts ovate, 
triangular; raceme porrect, several-flowered. J. two or three, 
plicate, oblong-lanceolate, acuminate. Pseudo-bulbs pyriform. 
Origin unknown, 1887. 
P. Lindeni (Linden’s).* ji. seven to twelve in a. raceme; 
sepals and petals green, flushed with deep purple except at 
the pe and spotted with blackish-purple; lip margined and 
striped with the same colour on a light ground. February. 
1. large, deep green, plicate. Pseudo-bulbs elongated-obovoid. 
prea! not recorded, 1892. A handsome species. (L. Vii., 
- -) 
P. Rossiana (H. J. Ross's). (fl. differing only in the lip and 
column from those of P. pendula. Pseudo-bulbs the size and 
shape of a hen’s egg. Habitat not recorded, 1889. 
P. selligera (saddle-bearing). l. the same colour as those of 
P. pendula, the epichil being perhaps yellower; column arm- 
less; callus saddle-like, with deep, argute margins, covering 
the whole disk. Demerara, 1887. This is closely related to 
P. pendula, : ‘ 
PERNETTYA. To the species described on p. 80, 
Vol. IIIl., the following should be added : 
P. floribunda (abundant-flowered) A hardy shrub, in the 
way of P. mucronata, of which it is probably a variety, but 
more free-flowering and with larger crimson berries. Extra- 
tropical South America, 1883. (G. C. 1883, xviii., p. 648, f. 113.) 
P. mucronata. Of this there are a number of beautiful 
forms, the best being cariea nana, coccinea lilacina, macro- 
carpa, nigra major, rosea purpurea, sanguinea, and speciosa. 
All are useful for pot culture, for room and window decoration 
in winter and early spring. 
P. phillyrezfolia (Phillyrea-leaved). 1. white, solitary; 
corolla ovate-urceolate ; pedicels axillary. /. lanceolate, sharply 
mucronate, remotely toothed, glabrous, one-nerved. Branchlets 
sparsely bristly. h. lft. Peru. Syn. Arbutus phillyrecefolia, 
PERONEA COMARIANA. This is the correct 
name of the pest referred to under Strawherry— 
Insects as P. comparana. It is synonymous with 
P. proteana and P. potentillana. 
PERONEA VARIEGANA. Sce Rosa—Insects. 
PERONOSPORA GANGLIONIFORMIS. See 
Lettuce Mildew. 
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