Orchidee.) FLORA OF TASMANIA. 3 
15. CALEANA.—An erect, slender herb, with a fibrous underground root terminated by a naked tuber, 
one linear leaf, a long scape, few rather large fuscous-green flowers, which have the irritable labellum 
shaped like a hammer, with the head placed over the flower (p. 8). 
D. Anther persistent, at the back of and parallel to the column, or sunk in a deep notch of the column, its apex point- 
ing forwards and upwards. Pollen powdery. (Neottiex.) 
a. Labellum anticous. 
15. THELYMITRA.—Stout or slender herbs, with one linear leaf, and one- or a few-flowered raceme of flowers, 
whose petals, sepals, and labellum are nearly equal and similar: the labellum without glands (p. 3). 
16. DIURISs,—Generally tall, slender herbs, with several linear radical leaves and few-flowered racemes, linear 
lateral sepals placed below the three-lobed labellum, and a petaloid staminodium on each side of the base 
of the column (p. 6). 
17. CALOCHILUS.—A stout, erect herb, with leafy stem, a spike generally of reddish-brown flowers, which 
have the labellum beautifully fringed with long purple hairs (p. 14). 
18. SPIRANTHES.—A slender, leafy herb, with a few linear leaves, and twisted spike of small pink flowers 
B. Labellum posticous. 
19. PRASOPHYLLUM.—Slender or stout herbs, leafy or leafless, bearing two sessile coated tubers, and spikes 
of small greenish-yellow or purple flowers. Column short, with the margins expanded into staminodia 
(p. 9). 
20. CRYPTOSTYLIS.— A tall, slender herb, with one radical, petioled, linear-lanceolate, coriaceous leaf, and a 
few-flowered spike of rather large red-brown flowers (p. 8). 
Tribe I. NxorriEx. 
Gen. I. THELYMITRA, Forst. 
Perianthium regulare, foliolis omnibus (labello incluso) conformibus. Zabellum sessile, nudum. Co- 
lumna bifida, cucullata, trifida, lobo medio emarginato v. trifido, lateralibus porrectis crenatis v. in appen- 
dicem apice plumosam productis. Anthera persistens, lobo medio columns inserta, stigmate libero paral- 
lela, inclusa v. semiexserta, bilocularis. Pollinia 4, stigmatis glandule affixa.—Herbe ; radicibus plerumgue 
bitubereulatis ; folio lineari (rarius lanceolato), sepissime solitario ; scapo 2-3-bracteato, apice 1-6-floro ; 
floribus albis ceruleis carneis purpurascentibus flavidisve, sub sole apertis, tempore nehuloso clausis. 
This genus may be distinguished at once by the segments of the perianth and sessile labellum being nearly all 
equal and similar, and by the column forming a rather membranous hood, which encloses the suberect anther. It 
abounds in extratropical Australia and New Zealand, but is very rare in tropical Australia, and, except one species 
found in the lofty mountains of Java, none are known to inhabit other countries but those mentioned, though some 
will no doubt be found in New Caledonia, etc. In the ‘New Zealand Flora’ I have alluded to the extreme diffi- 
culty, if not impossibility, of characterizing the forms of the genus in that country, and there is not less difficulty 
with regard to some of the Australian ones. Of these Brown enumerates ten, and Lindley twenty-nine (including 
Macdonaldia). 
The Tasmanian species, of which Brown had one only, may be reckoned at seven, according to Mr. Archer's 
and my opinion. Of these, four belong to the very distinct section Macdonaldia, which has no plumose appendages 
to the column, and are very distinct from one another (though it is sometimes difficult to discriminate dried speci- 
cimens of T. carnea and T. venosa from small forms of T. nuda and irioides). The other three are all extremely 
variable in size and many minor points, but are, I think, easily referable to T. nuda, angustifolia, and ürioides. 
Of these three species, 7. irioides has the middle lobe of the column truncate, trifid, laciniated, or crested, and 
shorter than the lateral feathery lobes; in 7. nuda it is hooded, notched or bilobed, and higher than the lateral 
