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Pterostylis (Greek, wing column; the column is broadly winged). Orchidaceae. Terrestrial herbs with small underground tubers: radical lvs. ovate; st.-lvs. developed and linear or lanceolate, or reduced to scarious sheathing scales: fls. usually green, often tinged red or brown, large and solitary or smaller and several in a raceme; dorsal sepal broad, erect, incurved and very concave; petals lanceolate-falcate, attached to the basal projection of the column; labellum on a short claw at the end of the basal projection of the column, movable; column with a pair of hatchet-shaped or quadrangular wings.—About 50 species, mostly Australian but a few in New Zeal, and New Caledonia and 1 in New Guinea. P. curta, R. Br. Lvs. in a radical rosette, usually on long petioles, ovate or broadly elliptical, 5-9-nerved: scapes 1-fld.; usually about 6 in. high; galea erect, acute; lip linear, obtuse, entire, rather longer than the column; wings of the column with the lower lobe long and obtuse, the upper lobe short and broad. Austral. B.M. 3086. O. 1910:104. Cult, to some extent in greenhouses abroad as are the following: P. acuminata, R. Br. Austral. B.M. 3401; P. Banksii, R. Br. New Zeal. B.M. 3172; P. Baptistii, Fitzg. Austral. B.M. 6351; and P. nutans, R. Br. Austral. B.M. 3085. They are prop, by division and thrive in lf .-mold lightened by a little sand; the lower third of the pots should be filled with broken crocks.
F. Tracy Hubbard.
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