Page:Manual of the New Zealand Flora.djvu/735

Corysanthes.] A very remarkable and distinct species, easily recognised by the thin acuminate 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, ½–2 in. high. Leaf sessile or shortly petiolate, ½–1¼ 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 ½ in. long, dull-purple or purplish-green; bract short. Upper sepal narrow, concave, arched over the lip, acuminate. Lateral sepals and petals filiform, 1–1½ in. long. Lip tubular below, the margins meeting behind the column and enclosing 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 rotundifolia, ''Hook. f. Fl. Nov. Zel.'' i. 251.

6. C. triloba, ''Hook. f. Handb. N.Z. Fl.'' 265.—Rather stout, variable in size. Leaf on a petiole ½–2 in. long; blade ½–1½ 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 ⅓–½ 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, ¾–2 in. 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. hypogæa, Col. in Trans. N.Z. Inst. xvi. (1884) 336. Nematoceras triloba, ''Hook. f. Fl. Nov. Zel.'' i. 250.