Page:Manual of the New Zealand Flora.djvu/236

196 The trifoliolate leaves at once separate this from all the other New Zealand species. Mr. Petrie's H. hydrophila has no distinguishing characters apart from its much smaller size. The typical form is also found in Australia and Tasmania.

3. H. dissecta, Hook. f. Fl. Nov. Zel. i. 84.—Small, slender, matted, more or less hispid-pilose. Stems much branched, creeping and rooting, 3–9 in. long. Leaves alternate or in alternate fascicles, ⅓–1 in. diam., orbicular or orbicular-reniform, 3–7-lobed almost to the base; lobes obovate-cuneate, acutely toothed or almost laciniate, hairy on both surfaces; petiole ½–1½ in. long. Peduncles variable in length, ½–2 in. long, longer or shorter than the leaves; umbels 20–40-flowered. Flowers small, sessile. Fruit densely crowded, small, red-brown, glabrous; carpels somewhat turgid, with one obtuse rib on each face; margins acute.—''Handb. N.Z. Fl. 86; Kirk, Students' Fl.'' 188.

4. H. americana, ''Linn. Sp. Plant.'' 234.—Small, very slender, matted, pale-green and glistening, glabrous or with a few loose hairs on the petioles. Stems 3–6 in. long, filiform, much branched. Leaves very delicate and membranous, ¼–¾ in. diam., orbicular-reniform, 5–7-lobed: lobes shallow, crenate; petioles ½–1½ in. long; stipules small. Umbels small, 3–6-flowered, sessile in the axils of the leaves or very shortly peduncled. Flowers sessile or nearly so. Fruit minute, pale yellowish-brown, glabrous, or one or both carpels more or less hispid; carpels wath one rib on each face, margins acute.—''Hook. f. Fl. Nov. ''Zel. i. 82; ''Handb. N.Z. Fl. 85; Kirk, Students' Fl.'' 187.

5. H. pterocarpa, ''F. Muell. in Trans. Vict. Inst.'' i. (1855) 126.—Smooth, often shining, perfectly glabrous or sparingly pilose. Stems slender, 6–14 in. long, branched, creeping and rooting. Leaves ½–1 in. diam., orbicular-reniform with a narrow or closed sinus, very thin and membranous, obscurely 3–7-lobed; lobes