

AN ENCYCLOPAEDIA OF HORTICULTURE. 



247 



Pterostylia continued. 



curved, and very concave ; petals lanceolate-falcate, 

 curve'": under the dorsal sepal, and forming with it an 

 arched or almost hood-shaped upper lip or helmet; 

 Literal 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, thrive in 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). /. green ; galea lin. to IJin. long, 

 usually produced into a point ; lip oblong-linear, tapering to a 

 point ; scape one-flowered. 6in. to 9in. high. April. L in a 



-. . . . . 



radical rosette, orate or broadly elliptical, and five or seven- 



3401; 

 P. Ran kail ( 



nerred. A. 6in, 1827. (B. M. 3401; F. A, O., Part 5.) 



(Banks'). ft, green, solitary, 2in. to Sin. long ; upper 

 sepal arched forward, the lateral ones produced into long, 



slender tails ; lip linear, the tip exserted. ApriL I. numerous, 

 alternate, sheathing the whole stem, rising above the flower, 

 larrow lin 



inear-lanceolate, acuminate. A. 6in. to 18m. New Zea- 

 land, 1832. (B. M. 3172.) 



P. Bapttsttl (Baptist's)^ JL green, marked with white and 

 brown, solitary, and adorned with two bristle-like antenn*. 

 Winter. 1. rosulate, basilar, petiolate, oblong-cuneate, the 

 upper ones ascending the rachis. A. 1ft 1877. (B. M. 6351 ; 

 G. C. n. s., ix. 213.) 



P. cnrta (short-lipped). JL green ; galea erect, about IJin. long, 

 acute, but not acuminate, the lower lip cuneate, with two 

 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, orate or broadly 

 elliptical, fire to nine-nerved, from under lin. to Ijin. long. 

 1829L (B. M. 3086 ; F. A. O., Part 5.) 



P. nutans (nodding). JL 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 broadly 



i iiinarn. fin nhIiJ[BiMiir nfiliM mmi*i minutely ciliated ; 



ape one-fiowered, 6in. to 12m. high. September, L in a 

 radical rosette, petiolate, orate or elliptical, iin. to IJin. long. 

 1826. (B. M. 3085?) 



FTEROSTYRAX. A synonym of Halesia (which 

 tee). 



PTEROTA. A synonym of Zanthoxylum (which 

 tee). 



PTEROZONTTTM. Included under Gymnogramme. 



PTERYGOCALYX. A synonym of Crawfurdia. 



PTERYGODIUM (from pterygodes, wing-like ; 

 alluding to the appearance of the sepals). Monk's-cowl 

 Orchid. OBD. Orchideae. 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-formed appendage at its base. 

 Probably none of the species are now in cultivation. 



PTILOCNEMA. A synonym of Fholidota (which 

 tee). 



PTILOMERIS (from ptOon, a feather, and merit, a 

 part; alluding to the fringed, chaffy scales of some of 

 the species). STN. Hymenoxyt. OBD. 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, lignlate, two or three-toothed; involncral 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. eoronaria, the 

 only species calling for mention here, may be treated as 

 other hardy annuals. 



PtUomeris continued. 



P. coronaria (crowned). JL-headt, ray florets oblong ; inrolucral 

 scales lanceolate ; receptacle pilose. June. 1. mostly opposite. 

 the divisions capillary. A. Iff 1838. Plant branched fr^Tthe 

 base, minutely puberulent SYS. Uymenoxyt cab/arnica (B. M. 

 Xi:\. _ 



PTHiOTBICHUM. Included under Alyesum. 



PTYCHOSFERMA (from ptyche. a fold or wind. 

 ing, and eperma, a seed; referring to the ruminated 

 albumen). Australian Feather-palm. SYN. Seaforthia. 

 OBD. Pcdmce. 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; epadix with 

 spreading, often slender, branches. Fruit ovoid or ellip- 

 soid, sometimes beaked, terete or snlcate, one-seeded, 

 the albumen more or less ruminated. Leaves terminal, 

 equally pinnatisect; segments thickened on the margins, 

 prsemorse, 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. Alexandras (Alexandra's). 1. pinnate, beautifully arched, 



quite red when young, but light green when mature ; rachia 



smooth. Stems rather slender. A. 70ft. to 80ft. Queensland, 



(F. d. S. 1916.) 



1870. A rery elegant species, rare in cultivation. 

 ArehontojJuenvc Alexandra is now the proper name 

 plant 



of this 



P. Cnnninghamiana (Cunningham's).* niawarra Palm. I 2ft 

 to 10ft long; puuue lanceolate, narrow, unequally bifid at the 



