2 FLORA OF TASMANIA. [ Orchidee. 
To facilitate the recognition of the Tasmanian Orchidee, 1 give a clavis of the genera, founded on the 
most prominent characters these present; but a tyro will find it exceedingly difficult to make out any 
satisfactorily until he has acquired some general knowledge of the majority. 
A. Anther deciduous, terminal. Pollen waxy. (Vandezx). 
1. GUNNIA.—An epiphyte, with long, tortuous, aerial roots, distichous falcate leaves jointed near the base, 
and a simple raceme of yellow, sweet-scented flowers (p- 32). 
2. DIPODIUM.—A terrestrial, leafless herb, with a large erect raceme of rose-coloured, spotted flowers. 
Sepals and petals revolute at the apex (p. 32). 
B. Anther deciduous, terminal. Pollen granular. (Gastrodiee.) | 
3. GASTRODIA.—A leafless, dirty-white or pale-brown herb, with a fleshy tuberous root, a stem with sheath- 
ing scales, and few-flowered raceme of whitish drooping flowers, whose sepals and petals are united into 
a tubular, ventricose, 5-toothed perianth (p. 31). 
C. Anther deciduous, terminal. Pollen powdery. (Arethusez.) 
a. Labellum anticous. 
4. MICROTIs.—Slender, erect herbs, with tuberous roots at the base of the stem, narrow linear leaves, crowded 
spikes of very minute green flowers (p. 24). 
5. ACIANTHUS.—Small, slender, delicate plants, with long-pedicelled tubers at the base of the stem, one ses- 
sile cordate leaf on the stem, and a few racemose brownish flowers, with long points to the sepals and 
petals (p. 25). 
6. CyRTOSTYLIS.— Similar to Acianthus, but with the column dilated at the apex (p. 25). 
7. CHILOGLOTTIS.—Small herbs, with long underground roots, each terminating in a tuber; two sessile 
leaves at the base of the scape, and one (rarely two) terminal reddish-brown and green flower, whose 
labellum bears large, pedicelled, capitate, dark red-brown glands (p. 28). 
8. ERIOCHILUS.—A very slender herb, with a long underground root terminated by a naked tuber, one ses- 
sile ovate leaf on the scape, and small greenish-white pubescent flowers, having the lateral sepals ungui- 
culate (p. 26). . ` 
9. CALADENIA.—Slender, often beautiful herbs, mostly covered with glandular pubescence or long hairs, 
having a long underground root terminated by a coated tuber, one linear or oblong radical leaf, and a 
1-2-flowered scape; flowers often large, with spreading narrow segments, and the labellum studded with 
pedicelled glands (p. 26). _ 
- GLOSSODIA.—Small pilose herbs, with the general characters of Caladenia, but differing in the labellum 
being sessile, having no glands, but an erect projection at the very base, close to the column (p- 31). 
. PTEROSTYLIS.—Pale-green, slender, often membranous herbs, with a long underground root terminated 
by a naked tuber, radical or alternate cauline leaves or none, and solitary or racemose green transparent 
flowers. Upper sepal galeate. Labellum irritable. Column very long, with auricled wings at the top, 
and the stigma halfway down its face (p. 18). 
- CORYSANTHES.—A small, singular-looking plant, with a long underground root terminated by a naked 
tuber; one sessile, broad, cordate leaf, and one almost sessile red-brown flower as large as the leaf, with 
a very large galeate dorsal sepal, and larger, cucullate, fimbriated labellum. Anther one-celled (p. 15). 
. BURNETTIA.—A very small, stout herb, 2 inches high, with a few alternate leaves, and one or two erect 
flowers, nearly equal sepals and petals, with involute margins, and a short, broadly-cuncate, papillose 
labellum (p. 16). 
B. Labellum posticous. 
14. LYPERANTHUS.—A short, stout, rather fleshy herb, with a long underground root terminated by a naked 
tuber, several leaves at the base of the scape, and red-brown racemose flowers. Sepals spreading. La- 
bellum posticous, with crenulate margins (p. 16). 
T 
© 
ren 
kel 
— 
to 
— 
e 
