268 i. orchidea:. [ Caladenia . 
group, J. B. H. A singular plant, differing from Caladenia in several respects, tut bardly 
generic-ally. 
12. PTEROSTYXilS, Br. 
Usually slender, leafy, erect, simple, rather succulent, glabrous herbs. 
Roots of small tubers terminating underground caulicles. Leaves radical or 
cauline, sheathing at the base. Flowers 1 in the N. Zealand species, mem- 
branous, green. — Perianth closed or open. Upper sepal and petals combined 
or conniving and forming a very concave boat-shaped hood ; lateral sepals con- 
nate, ascending or deflexed. Lip small, clawed, its tip exserted between the 
free tips of the lateral sepals, or wholly exposed, often irritable, furnished 
with an erect or curved appendage at the base. Column slender, curved, 
broadly winged above. Anther terminal, persistent. Pollen- masses 4. 
A large temperate Australian, Tasmanian, and New Zealand genus, not found elsewhere. 
A. Lateral sepals erect. Lip glabrous, included, or the tip only exserted. 
Leaves all cauline, or cauline and radical, all similar or nearly so. 
Flower 2-3 in. long. Leaves all linear, grass-like 1. P. Banlcsii. 
Like P. Banksii, tut smaller. Flower f-l in. long .... 2. P. graminea. 
Lower leaves oblong. Flower 1 in. long 3. P. micromega. 
Radical leaves broad, cauline reduced to bracts. 
Glabrous. Leaves oblong. Bracts large, sheathing .... 4. P.foliata. 
Glabrous. Leaves long-petioled, ovate-cordate 5. P. trultifolia. 
Puberulous. Leaves sbort-petioled, ovate-cordate 6. P. puberula. 
B. Lateral sepals deflexed. Lip filiform, plumose, exserted . . . 7- P- squamata. 
1. P. Banksii, Brown; — FI. N. Z. i. 248. Tall, leafy, 6-18 in. 
high. Leaves numerous, alternate, sheathing the whole stem, rising above 
the flower, narrow linear-lanceolate, acuminate. Flower solitary, 2-8 in. 
long. Upper sepal arched forwards, and lateral produced into long slender 
tails. Lip linear, glabrous, its tip exserted; appendage linear, curved, villous 
at the tip. — Bot. Mag. t. 3172. 
Var. fj. Leaves broader, in. Sepals less produced into long tails. P. australis. 
Hook. f. FI. N. Z. i. 248. 
Abundant throughout the Northern and Middle Islands to Otago, Banks and Sol under, 
etc. Var. £, Middle and Southern Islands : Port William and Thomson’s Sound, Lyall. 
2. P. graminea, Hook. f. FI. N. Z. i. 248. Slender, leafy, 6-10 in. 
high. Leaves sheathing, narrow linear-lanceolate, 1-3 in. long. Flowers 
solitary, f-l in. long, of the same form as P. Banksii, but much smaller, and 
the sepals less produced into slender tails. 
Northern and Middle Islands, not uncommon: east coast, Colenso ; Auckland, Sin- 
clair ; Otago, Lyall. Probably only a small state of P. Banksii, but approaching the Aus- 
tralian P. pracox. 
3. P. micromega, 1 Took. f. FI. N. Z. i. 248. Slender, 3-8 in. high, 
leafy. Lower leaves large, ovate-oblong or lanceolate, obtuse or acute, sessile 
or petioled, in. long ; cauline smaller, more acuminate, f—f in. Flower 
solitary, suberect, 1 in. long. Upper sepal narrow, slightly arched, caudate- 
acuminate ; lateral erect, with narrow slender points. Petals narrow, acumi- 
nate. Lip glabrous, its tip exserted ; appendage villous. 
Northern Island, Edgerley ; east coast, and bogs near Wairarapa, Colenso , -^Coro- 
mandel gold-fields, Jolliffe. Approaching the Australian P. cucullata, hut smaller. 
4. P. foliata, IIooIc. f. FI. A Z. i. 249. Rather stout, scapigcrous. 
