AN ENCYCLOPADIA 
OF HORTICULTURE. 247 
Pterostylis—continued. 
curved, and very concave; petals lanceolate-falcate, 
curved under the dorsal sepal, and forming with it an 
arched or almost hood-shaped upper lip or helmet; 
lateral sepals more or less united in a two-lobed lower 
lip, the lobes often terminating in long points; lip on 
a short claw at the end of the basal projection of the 
column; column elongated within the galea, and curved 
with it. Radical leaves ovate, tufted; cauline ones 
linear or lanceolate, or reduced to sheathing scales. 
The under-mentioned species, which are those best 
known to gardeners, thriverin leaf mould, lightened by 
the admixture of a little sand. Before putting in the 
soil, the pots should be one-third filled with broken 
crocks. Propagated by divisions. Except where other- 
wise stated, all the species here described are Aus- 
tralian. 
P. acuminata (taper-pointed). fl. green ; galea lin. to liin. long, 
usually produced into a point; lip be gg, EREN tapering to a 
point; scape one-flowered, 6in. to Qin. high. April. l in a 
radical rosette, ovate or broadly elliptical, and five or seven- 
nerved. h. 6in. 1827. (B. M. 3401; F. A. O., Part 5.) 
P. Banksii (Banks’). fl. green, solitary, 2in. to 3in. long; upper 
sepal arched forward, lateral ones produced into long, 
slender tails; lip linear, the tip exserted. April. l. numerous, 
alternate, sheathing the whole stem, rising above the flower, 
narrow linear-lanceolate, acuminate. k. 6in, to 18in. New Zea- 
land, 1832. (B. M. 3172.) 
T ptistii (Baptist’s).* f. green, marked with white and 
brown, —— and adorned with two bristle-like antenne. 
Winter. J. rosulate, basilar, petiolate. 
upper ones ascending the rachis, h. 1ft. 
G. Sn. s., ix. 213.) 
P. curta (short-lipped). fl. green; galea erect, about lin. long, 
acute, but not acuminate, the lower li cuneate, with 25 
broadly-lanceolate lobes; lip linear, rather longer than the 
column ; scapes one-flowered, usually about 6in. high. October. 
l in a radical rosette, usually on long petioles, ovate or broadly 
elliptical, five to nine-nerved, from under lin. to lin. long. 
1829, 3086; F. A. O., Part 5.) 
P. nutans (nodding). f. green; galea nearly lin. long, much — 
curved near the base, and again towards the end, so as to give the 
flower a nodding appearance, the lower lip shortly and dly 
cuneate ; lip oblong-linear, obtuse, sometimes minutely ciliated ; 
scape one-flowered, 6in. to 12in. high. September. 
radical rosette 
oblong-cuneate, the 
1877. (B. M. 6351; 
Lins 
tiolate, ovate or elliptical, in. to Hin. long. 
-) 
1826. (B. M. 
PTEROSTYRAX. A synonym of Halesia (which 
see). į 
PTEROTA. A synonym of Zanthoxylum (which 
see). 
PTEROZONIUM. Included under Gymnogramme. 
PTERYGOCALYX. A synonym of Orawfurdia, 
PTERYGODIUM (from pterygodes, wing-like ; 
alluding to the appearance of the sepals). Monk’s-cowl 
Orchid. ORD. Orchideew. A genus comprising about half- 
a-score species of greenhouse, leafy, terrestrial, South 
African orchids. Flowers spicate, few or solitary; 
dorsal sepal connivent with the petals, and more or less 
coherent; lip adnate to the base of the column, and fur- 
nished with a large, tongue: ed appendage at its base. 
Probably none of the species are now in cultivation. 
PTILOCNEMA. A synonym of Pholidota (which 
see). * 
PTILOMERIS (from ptilon, a feather, and meris, a 
part; alluding to the fringed, chaffy scales of some of 
the species). Syn. Hymenorys. ORD. Composite. A 
small genus (about three species) of hardy, annual, Cali- 
fornian herbs, regarded, by Bentham and Hooker, as 
synonymous with Actinolepis. Flower-heads yellow, pe- 
dunculate at the tips of the branches; ray florets in one 
series, ligulate, two or three-toothed; involucral bracts 
one-seriate ; receptacle convex or conical, naked or very 
slightly bristly; achenes linear. Leaves opposite, or the 
upper ones rarely nearly all opposite, remotely toothed, 
incised, or once or twice pinnatifid. P. coronaria, the 
only species calling for mention here, may be treated as 
other hardy annuals. ‘ 
Ptilomeris—continued. 
P. coronaria (crowned). fl.-heads, ray florets oblong ; involucral 
scales lanceolate; receptacle pilose. June. l. mostly opposite, 
the divisions capillary.. h. lft. 1838. Plant branched from the 
— minutely puberulent. Syn. Hymenoays californica (B. M. 
PTILOTRICHUM. Included under Alyssum. 
PTYCHOSPERMA (from ptyche, a fold or wind- 
ing, and sperma, ca seed; referring to the ruminated 
albumen). Australian Feather-palm. Syn. Seaforthia. 
ORD. Palme. A genus of elegant, unarmed, stove palms, 
usually with tall trunks. About a dozen species have 
been enumerated, natives of tropical Australia, New 
Guinea, and the Pacific Islands. Flowers usually rather 
small; complete spathes two, caducous; spadix with 
spreading, often slender, branches. Fruit ovoid or ellip- 
soid, sometimes beaked, terete or sulcate, one-seeded, 
the albumen more or less ruminated. Leaves terminal, 
equally pinnatisect ; segments thickened on the margins, 
premorse, the terminal one confluent ; sheaths elongated. 
The species thrive best in fibrous loam, leaf mould, and 
sand. Thorough drainage, and an abundant supply of 
water, are important points in their culture. Propagated 
by seeds. 
P. Alexandre: (Alexandra’s). J. pinnate, beautifully arched, 
quite red when young, but light green when mature; rachis 
smooth. Stems rather slender. h. 70ft. to 80ft. Queensland. 
1870. A very elegant species, rare in cultivation. (F. d. S. 1916.) 
— Alexandre is now the proper name of this 
plant. ` 
— T 
os 
Fig. 317. PrycHOSPERMA CUNNINGHAMIANA. 
Cunningham’s).* Illawarra Palm. Z. 
AM oeorneyg narrow, unequally bifid at the 
