X. ORCHIDE J5. 
265 
8. ADENOCHILUS, Hook. f. 
A very slender glabrous herb. Stem simple, with one sessile, ovate, acute 
leaf in the middle, 1 -flowered. — Perianth downy. Upper sepal concave, acu- 
minate, adnate to the back of the column ; lateral oblique, 3-nerved, lanceo- 
late, placed under the lip. Petals suberect, linear-lanceolate. Lip shortly 
clawed, 3-lobed, middle lobe caudate, disk and middle lobe with about 4 
rows of stipitate glands. Column slender, curved, winged ; wings produced 
upwards into 2 toothed lobes. Anther hidden behind the stigma and between 
the lobes of the column, persistent. Ovary very long, erect. 
A curious genus, of but one species, allied to Caladenia, Chiloglottis, and the Austra- 
lian genus Eriochilus. 
1. A. gracilis. Hook. f. FI. N. Z. i. 246. t. 56 A. Stem 6-10 in. 
high. Leaves membranous, acute, f in. long ; sheath short. Stem above 
the leaf with one sheathing bract in the middle, and another at the base of 
the peduncle. Ovary | in. long. Perianth in. broad ; segments all very 
acuminated, veined. Lip small, concealed within the perianth. Anther or- 
bicular, mucronate. 
Northern Island : Bay of Plenty, Colenso. 
9. CORYSANTHES, Brown. 
Very small, delicate, succulent, terrestrial herbs. Root of small tubers on 
slender caulicles. Leaf 1, very broad. Flower 1, large, purple, almost sessile 
on the leaf ; peduncle elongating after flowering. — Upper sepal very large, 
long, curved forward from the base, narrow boat- or helmet-shaped ; lateral 
free or connate at the base, very small, or long and filiform. Petals usually 
very small. Lip very concave or involute, usually fimbriate at the edges. 
Column short or slender. Anther terminal, 1-celled, persistent. Pollen- 
masses 4, powdery. 
A remarkable genus of beautiful little plants, natives of the Malayan islands, temperate 
Australia, and New Zealand. The genus Nematoceras , established in the New Zealand 
Flora, 1 think merges into Corysanthes through the Malayan species. The species are diffi- 
cult of discrimination, and perhaps are not all permanently distinct. 
Leaf reniform, 3-lobed at the tip. Lip 2-partite, recurved .... 1. C. triloba. 
Leaf oblong-ovate ; petiole short. Lip convolute, truncate, toothed . 2. C. oblonya. 
Leaf orbicular-cordate 3. C. rotundifolia. 
Leaf ovate-oblong orbicular or cordate ; petiole short. Lip tubular, 
recurved 4. C. rivularis. 
Robust. Leaf large, cordate ; petiole and scape very thick. Lip 
broad, recurved, undulate 5. C. macrantha. 
1. C. triloba, Ilook.f. — Nematoceras ,F1. N. Z . i. 250. Leaf f-li in. 
diam., membranous, orbicular- reniform, 3-lobed at the very tip; middle 
lobe acute ; petiole ^-3 in. long. Peduncle sometimes 8 in. long after 
flowering. Flower in. long. Lateral sepals and petals filiform, sometimes 
2 in. long, 5 times longer than the lip ; upper dilated and obtuse at the tip. 
Lip very large, of 2 large recurved lobes, margins nearly entire. Column 
very small. 
Northern Island : damp woods, east coast, Cape Palliser, Cape Titiokura, etc., Colenso ; 
Auckland, Sinclair; Otago, Hector and Buchanan. The Middle Island specimens alluded 
