196 UMBELLIFERE. [ Hydrocotyle. 
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, creep- 
ing and rooting, 3-9in. long. Leaves alternate or in alternate 
fascicles, +-lin. 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 $-14in. long. 
Peduncles variable in length, $-2in. long, longer or shorter than 
the leaves ; umbels 20-40-fiowered. 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. 
Nort Isuanp: Near Maunganui Bluff, Petrie! Northern Wairoa, T. F’. C.; 
Whangarei, Carse! Petrie! T. F.C.; Matakana, Kirk! Hunua, Kirk! T. F.C.; 
Lower Waikato, Carse! Hawke's Bay, Colenso. SourH Istanp: Marlborough, 
Macmahon! near Westport; Townson! Otira Valley and Catlin’s River, Petrie f 
Sea-level to 1200 ft. November—February. 
A well-marked plant, perhaps more closely allied to H. moschata than to any 
other, but differing widely in the deeply and sharply lobed leaves. Mr. Carse 
sends a form with proliferous umbels. 
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 3-6in. long, filiform, much branched. 
Leaves very delicate and membranous, +3 in. diam., orbicular-reni- 
form, 5-7-lobed: lobes shallow, crenate; petioles 3-13in. 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 with one rib on each face, margins. 
acute.—Hook. f. Fl. Nov. Zel. i. 82; Handb. N.Z. Fl. 85; Kirk, 
Students’ Fl. 187. 
Var. heteromeria, Kirk, |.c. 188.—Rather larger. Leaves 4-1lin. diam. ; 
petioles often 2in. long. Umbels usually shortly peduncled; peduncles some- 
times half the length of the petioles. Fruit as in the type.—H. heteromeria, 
A. Rich. Hydrocot. 200; A. Cunn. Precur.n. 499; Hook. f. Fl. Nov. Zel. i. 82 ; 
Handb. N.4. Fl.86. H. nitens, Col. in Trans. N.Z. Inst. xxiii. (1891) 386. 
NortH anp SoutH Istanps, StEwart Istanp: Not uncommon from the 
North Cape southwards. Sea-level to 2000 ft. October—February. The 
typical form is also found in North and South America. 
5. H. pterocarpa, F’. Muell. in Trans. Vict. Inst. 1. (1855) 126. 
—Smooth, often shining, perfectly glabrous or sparingly pilose. 
Stems slender, 6-14in. long, branched, creeping and rooting. 
Leaves 4-lin. diam., orbicular-reniform with a narrow or closed 
sinus, very thin and membranous, obscurely 3-7-lobed; lobes. 
