ARCHIDACEAE> 
366 PPO | [ Corysanthes. 
and enclosing it, base with a rounded auricle on each side; upper part 
abruptly recurved and expanded, tip acute, margins very minutely denti- 
culate. Column short, stout, bent backwards.—Cheesem. Man. N.Z. Fl. 
(1906) 695. C. orbiculata Col. in Trans. N.Z. Inst. xxi (1891) 389. 
Nematoceras rotundifolia Hook. f. Fl. Nov. Zel. 1 (1853) 251. 
Var. pandurata Cheesem.~— Leaves deeply lobed on each side, so as to be almost 
_ panduriform. Other characters precisely as in the type. 
Norra anp Sovutu IsLanps, STEwaRT ISLAND, AUCKLAND AND CAMPBELL 
istanps: Moist wooded ravines throughout, but oiten local. Sea-level to 2500 ft. 
September—Decem ber. Var. pandurata : Kaitaia (Mongonui County), &. A. Matthews / 
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 filiferm point, and in the 
broader reflexed portion of the lip. From small forms of C. macrantha it is best dis- 
tinguished by the almost sessile leaf and much smaller lip with an acute or acuminate 
tip. | 
able in size. Leaf on a petiole $-2 in. long; blade $-1} in. diam., reniform 
or orbicular, more or less distinctly 3-lobed at the tip, middle lobe acute, 
cordate at the base, fleshy when fresh, membranous when dry. Peduncle 
at first short, but elongating as the flower withers, and in fruit often 4-8 in. 
long. Flower $-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, 3-2 in. long. Lip involute, tubular below, the margins meet- 
ing 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 back- 
wards.—Cheesem. Man. N.Z. Fl. (1906) 695. OC. hypogea Col. in Trans. 
N.Z. Inst. xvi (1884) 336. Nematoceras triloba Hook. f. Fl. Nov. Zel. 1 
(1853) 250. 
Norra axp SourH Istanps, Srewart Istanp: Shaded places from the North 
Cape southwards, but often local. Sea-level to 4000 ft. July-September. j; Wb 
June 
iia Awecro te ( Meola S)Rorct&, §. 
8 € macrantha Hook. f. Handb. N.Z. Fl. (1864) 266.—Much larger 
than the other species, 2-8 in. high or more. Leaf on a petiole 4-3 in. long ; 
lamina 3-2in. diam., broadly oblong or orbicular, obtuse or apiculate or 
rarely 3-lobed at the tip, cordate or 9-lobed at the base, thick and fleshy 
when fresh, thin and membranous when dry, veins finely reticulate. Ped- 
uncle from the base of the petiole, at first short, but elongating as the 
flower withers, often 4-10 in. long in fruit. Flower large, 3-1 in. long, dark- 
purple; bract small. Upper sepal narrow, concave, arched over the lip, 
somewhat expanded above, acute or acuminate. Lateral sepals and petals 
filiform, 1-2 in. 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 undu- 
late, minutely erose or denticulate. Column short, stout, bent backwards. 
__Cheesem. Man. N.Z. Fl. (1906) 696. ©. papillosa Col. in Trans. N.Z. Inst. 
xvi (1884) 337. Nematoceras macrantha Hook, f: Fl. Nov. Zel. i (1853) 229, 
t. DTA. 
0 or toto W(515'9 al SSO. 
Corsfraa Jee Reeatinn (Heot-5-) Rotts 4. Beit, 
riloba Hook. f. Handb. N.Z. Fl. (1864) 265.—Rather stout, vari- pp 
if; 
