ORCHIDACEAE. 
Corysanthes. | 7 Tvblsieneiitels . 365 
Nort Istanp: Auckland—Kaitaia (Mongonui County), 2. H. Matthews! H. B. 
Matthews! H. Carse/ Aponga (Whangarei County), A. Thompson / 
Clearly allied to C. oblonga, but the flower is larger, the lateral sepals and petals 
much reduced in size, the upper sepal narrower at the base and more hood-shaped at 
the top, and the margin of the lip is not coarsely fringed, QQ , ve | 7 
4. C=oblonga Hook. f. 
andb. N.Z. Fl. (1864) 266.—Variable in size, 
3-21in. high. Leaf sessile, 3-14 in. long, ovate-oblong, apiculate, rounded 
or cordate at the base, thin and membranous, conspicuously veined when 
dry. Flowers small, shortly peduncled, solitary or very rarely two together, 
about $in. long, reddish-purple ; bract rather large, sometimes foliaceous, 
erect. Upper sepal narrow, concave, oblong when spread out, obtuse or 
apiculate, arched over the lip. Lateral sepals and petals filiform, +? in. 
long.+ Lip involute, the margins meeting behind the column and enclosing 
it, broadly semicordate when spread out; base with a rounded auricle 
or orifice on each side ; apex truncate, coarsely toothed or fimbriate, centre 
of disc with minute dentiform papillae. Column short, stout, curved to 
the front, with a swelling at the base.—Cheesem. Man. N.Z. Fl. (1906) 
694; ll. N.Z. Fl. ii (1914) t. 1998. Nematoceras oblonga Hook. f. FI. 
Nov. Zel. i (1853) 250, t. 57s. : 
NorTH AND Soutu IsLanps, Stewart Istanp: Not uncommon on moist shaded 
banks from the North Cape southwards. AvucKLAND IsLanps: North arm of Carnley 
FX 67. 
Harbour, 2B. C. Aston !/ , Sea-level to 2090 ft. Septem ber—Novem ber. £ a 7 
i aS ere Ye nee olhy 
5) rivularis Hook. f. Handb. N.Z. Fl. (1864) 266.—Very delicate and 
# 
membranous, 1-2}in. high. Leaf sessile, 4-2 in. long, ovate or oblong-9 Ge 
ovate, acuminate, deeply cordate or almost 2-lobed at the base, very thin 
and membranous, veins conspicuous, reticulated. Flower shortly pedun- 
culate or sessile between the lobes of the leaf, 1-}in. long; bract narrow, 
acuminate. Upper sepal narrow, concave, arched over the lip, gradually 
tapering into a long filiform point. Lateral sepals and petals filiform, 
1-2in. long, the petals usually exceeding the sepals. Lip involute, the 
margins meeting behind the column and enclosing it, broadly ovate-cordate 
when spread out; base with a rounded auricle or orifice on each side; 
upper portion curved forwards and downwards, acuminate or apiculate, 
margins undulate, entire. Column very short, stout, erect. —Cheesem. 
Man. N.Z. Fil. (1906) 694. Nematoceras rivularis Hook. f. Fl. Nov. Zel. i 
(1853) 251. Acianthus rivularis A. Cunn. Precur. (1836) n. 312; Hook. 
jf. Fl. Antarct. 1 (1844) 71. 
Nort anp Soutu Isianps, Stewart Isnanp, AucKLaND Isuanps: In damp 
wooded ravines from the North Cape southwards, but often local. Sea-level to 
2000 ft. Septem her-November. 
A very remarkable and distinct species, easily recognized by the thin acuminate 
leaf, very long filiform petals and lateral sepals, by the filiform point to the upper 
sepal, and acuminate lip. LP 
firs. weodctl. VS: 467 
6. €. rotundifolia Hook. f. Handb. N.Z. Fl. (1864) 266.—Variable in 
size, 3~2in. high. Leaf sessile or shortly petiolate, +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 
3 in. long, dull-purple or purplish-green ; bract short. Upper sepal narrow, 
concave, arched over the lip, acuminate. Lateral sepals and petals filiform, 
1-1}in. long. Lip tubular below, the margins meeting behind the column 
