Corysanthes. ] ORCHIDEH. 695 
A very remarkable and distinct species, easily recognised by the thin acumi- 
nate leaf, very long filiform petals and lateral sepals, by the filiform point to the 
upper sepal, and acuminate lip. 
5. C. rotundifolia, Hook. f. Handb. N.Z. Fl. 266.—Variable in 
size, 4-2in. high. Leaf sessile or shortly petiolate, 4-14 in. long, 
broadly oblong or orbicular, tip rounded and apiculate, deeply cordate 
or 2-lobed at the base, rather fleshy, membranous when dry, veins 
reticulated. Peduncle at first very short, but elongating as the 
flower withers. Flower 4in. long, dull-purple or purplish-green ; 
bract short. Upper sepal narrow, concave, arched over the lip, 
acuminate. Lateral sepals and petals filiform, 1-l4in. long. Lip 
tubular below, the margins meeting behind the column and enclos- 
ing it, base with a rounded auricle on each side; upper part 
abruptly recurved and expanded, tip acute, margins very minutely 
denticulate. Column short, stout, bent backwards.—C. orbiculata, 
Col. in Trans. N.Z. Inst. xxiii. (1891) 389. Nematoceras rotundi- 
folia, Hook. f. Fl. Nov. Zel. i. 251. 
NortH AND SoutH ISLANDS, STEWART ISLAND, AUCKLAND AND CAMPBELL 
Isntanps: Moist wooded ravines throughout, but often local. Sea-level to 
2500 ft. September—December. 
This may not be the C. rotundifolia of the Handbook, which is described 
as having a truncate lip. It differs from C. rivularis in the more coriaceous 
leaf, with a rounded tip, in the upper sepal not being produced into a filiform 
point, and in the broader reflexed portion of the lip. From small forms of 
C. macrantha it is best distinguished by the almost sessile leaf and much smaller 
lip with an acute or acuminate tip. Mr. R. H. Matthews sends me specimens 
from Kaitaia with the leaves deeply lobed on each side, so as to be almost. 
panduriform. 
6. C. triloba, Hook. f. Handb. N.Z. Fl. 265.—Rather stout, 
variable in size. Leaf on a petiole 4-2in. long; blade 4~-1Lin. 
diam., reniform or orbicular, more or less distinctly 3-lobed at the 
tip, middle lobe acute, cordate at the base, fleshy when fresh, mem- 
branous when dry. -Pedunele at first short, but elongating as the 
flower withers, and in fruit often 4-8 in. long. Flower 4-4 in. long, 
dull-purple ; bract rather small. Upper sepal narrow at the base, 
dilated above, obovate-spathulate when spread out, arched over the 
lip, concave, obtuse at the tip. Lateral sepals and petals filiform, 
erect, #-2in. long. Lip involute, tubular below, the margins 
meeting behind the column and enclosing it, and with a rounded 
auricle or orifice at the base on each side; upper part abruptly 
reflexed and much expanded laterally and downwards, forming a 
broad saucer-like entrance to the flower; margins erose or nearly 
entire. Column short, stout, bent backwards.—C. hypogexa, Col. in 
Trans. N.Z. Inst. xvi. (1884) 336. Nematoceras triloba, Hook. f. 
Fil. Nov. Zet. i, 250. 
NortH AnD SoutH Isnanps, STEwART Isuanp: Shaded places from the 
North Cape southwards, but often local. Sea-level to 2000 ft. July—Sep- 
tember. 
