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2. U. Mairii, Cheesem. n. sp.—Stems floating in still water, sparingly branched, 2–6 in. long, stouter than m the preceding species. Leaves numerous, all submerged, spreading, about ¼ in. long, pinnately divided into numerous capillary segments; segments broader than in U. protrusa; bladders numerous, about $1⁄10$ in. long, attached to the segments. Flowers not seen.

3. U. novæ-zealandiæ, Hook. f. Fl. Nov. Zel. i. 206.—Stemless. Roots slender, creeping, bearing numerous shortly pedicelled bladders about ⅛ in. diam. when fully grown. Leaves 1–3, all radical, often disappearing at the time of flowering, ¼–¾ in. long, rarely more, very narrow-linear or linear-spathulate, quite entire, rather fleshy, 1-nerved. Scape or peduncle very slender, variable in length, 3–9 in. high or more, simple, erect, 1–4-flowered; bracts small, opposite or in threes. Flowers shortly pedieelled, ¼–⅓ in. long, pale-purple with a yellow eye. Upper calyx-segment orbicular or nearly so, rounded or slightly retuse at the tip; lower rather smaller, concave, 2-lobed. Upper lip of the corolla much the smaller, narrow cuneate-oblong, constricted below the middle, truncate or nearly so at the tip; lower lip with a broad horizontal almost semicircular lamina about ⅓ in. diam., margin entire; palate with three raised ridges, each with a central groove; spur short, broad, obtuse. Capsule membranous, globose, ⅙ in. diam.—''Handb. N.Z. Fl.'' 222. U. subsimilis, Col. in Trans. N.Z. Inst. xvi. (1884) 334.