696 ORCHIDES. , [Corysanthes. 
7. CG. macrantha, Hook. f. Handb. N.Z. Fl. 266.—Much larger 
than the other species, 2-8in. high or more. Leaf on a petiole 
4-3in. long; lamina 3-2in. diam., broadly oblong or orbicular, 
obtuse or apiculate or rarely 3-lobed at the tip, cordate or 2-lobed 
at the base, thick and fleshy when fresh, thin and membranous 
when dry, veins finely reticulate. Peduncle from the base of the 
petiole, at first short, but elongating as the flower withers, often 
4-10in. long in fruit. Flower large, 4-lin. long, dark-purple; 
bract small. Upper sepal narrow, concave, arched over the lip, 
somewhat expanded above, acute or acuminate. Lateral sepals 
and petals filiform, 1-2in. long. Lip large, tubular below, the 
margins meeting behind the column and enclosing it, base with a 
rounded auricle on each side, upper part abruptly recurved and 
much expanded all round, margins undulate, minutely erose or: 
denticulate. Column short, stout, bent backwards.—C. papillosa, 
Col. in Trans. N.Z. Inst. xvi. (1884) 337. Nematoceras macrantha, 
Hook. f. Fl. Nov. Zel. i. 229, t. 57a. 
NortH AND SoutH Isnanps, STEWART IsLAND, CHATHAM ISLANDS, AUCKLAND 
AND CAMPBELL IsLANDS: Not uncommon in damp shaded places throughout. 
Sea-level to 2500 ft. Octob2r—December. 
Closely allied to C. triloba, but much larger, the leaves rarely 3-lobed at 
the tip, the upper sepal acute or acuminate, and the lip larger. Both it and 
C. triloba frequently have the peduncle bent backwards, so that the flower lies 
with the upper sepal undermost and the lip above. 
91. GASTRODIA. R. Br. 
Leafless terrestrial brownish herbs. Root long, tuberous, 
usuaily parasitic on the roots of other plants. Stem simple, erect, 
furnished with lax sheathing scales. Flowers in a terminal raceme. 
Sepals and petals connate into a ventricose 5-lobed tube more or 
less slit on the anterior side. Lip shorter than the perianth, 
attached at the base to the foot of the column, and adnate at 
the back to the perianth-tube; lamina erect, furnished with longi- 
tudinal raised lines or naked, margins undulate. Column long 
or short, narrowly 2-winged; rostellum small; stigma near the 
base of the column, prominent. Anther lid-like, incumbent; 
pollinia free, granular. 
A small genus of 8 or 9 species, ranging from New Zealand and Australia 
northwards to Malaya, the Himalayas, China, and Japan. 
Raceme 2-Sin., many-flowered. Perianth ?in. Column 
elongated, 3 the length of the lip k it 46 
Raceme 6-12in., very many flowered. Perianth in. 
Column very short, barely } the length of the lip .. 2.G. Cunning- 
hami. 
1. G. sesamoides. 
Stem slender, almost filiform. Raceme 1-3 in., 3-5-flowered. 
Perianth 4in. Column very short, barely } the length 
of the lip 3. G. minor, 
