646 UMBELLIFERAE. [ Lydrocotyle. 
4. H. americana Linn. Sp. Plant. (1753) 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, }?in. diam., orbicular-reniform, 5—7-lobed ; 
lobes shallow, crenate ; petioles 4-ldin. 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 (1853) 82; 
Handb. N.Z. Fl. (1864) 85; 7. Kirk Students’ Fl. (1899) 187; Cheesem. 
Man. N.Z. Fl. (1906) 196. 
Var. heteromeria 7'. Kirk l.c. 188.—-Rather larger. Leaves 4-1 in. diam. ; petioles 
often 2in. long. Umbels usually shortly peduncled ; peduncled sometimes 3 the 
length of the petioles. Fruit as in the type.—H. heteromeria A. Rich. in Ann. Sc. Phys. 
iv (1820) 200; A. Cunn. Precwr. (1838) n. 499; Hook. f. Fl. Nov. Zel. i (1853) 82; 
Handb. N.Z, Fl. (1864) 86. H. nitens Col. in Trans. N.Z. Inst. xxiii (1891) 386. 
NortH AND Sout Is~anps, Stewart IstanD: 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. i (1855) 126.—Smooth, 
often shining, perfectly glabrous or sparingly pilose. Stems slender, 6-14 in. 
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 crenate; petioles slender, 1—4 in, long. 
Peduncles rather slender, shorter than the leaves; umbels 3—8-flowered. 
Flowers shortly pedicelled or almost sessile. Fruit large, flat, broader than 
long, notched above and below, often mottled ; carpels with one rib on 
each face, and with the dorsal edge expanded into a broad wing.—Hook. f. 
Fl. Tasm. i (1860) 153, t. 33; Handb. N.Z. Fl. (1864) 86; 7. Kirk Students’ 
Fl. (1899) 188; Cheesem. Man. N.Z. FI. (1906) 196. 
NorrtH anp Sourn Isuanps: In lowland swamps from Mangonui to North 
Canterbury, but often local. December—February. Also in Victoria and Tasmania. 
_6. H. novae-zealandiae DC. Prodr. iv (1830) 67.—Very variable in 
size and habit of growth. Stems 3-12 in. long, much or sparingly branched, 
open or matted, creeping and rooting at the nodes, sometimes ascending 
at the tips, pilose or almost glabrous. Leaves 1-14in. diam., orbicular- 
reniform with usually an open sinus, obscurely 5-9-lobed or -angled ; lobes 
shallow, obscurely and obtusely crenate, rarely more acutely toothed, 
usually membranous but sometimes subcoriaceous, sparnmegly hairy or 
nearly glabrous ; petioles 4~-3in. long, slender, usually pilose with reversed 
hairs above. Peduncles shorter than the leaves; umbels 5—12-flowered. 
Flowers shortly pedicelled. Fruit 4 in. diam., broader than long, some- 
what flattened, glabrous, pale-brown, sometimes mottled : carpels rounded 
at the back, with an indistinct rib or groove on each face.—A. Cunn. 
Precur. (1838) n. 497 ; Raoul Choia (1846) 46: Hook. f. Fl. Nov. Zel. i (1863) 
83 ; Handb. N.Z. Fl. (1864) 86; 1. Kirk Students’ Fl. (1899) 189 ; Cheesem. 
Man. N.Z. Fl. (1906) 197. H. dichondraefolia A. Cunn. lc. n. 498. 
H. intermixta Col. in Trans. N.Z. Inst. xvii (1885) 240. H. alsophila 
Col. l.c. xviii (1886) 261. H.involucrata Col. l.c. xix (1887) 262. H.amoena 
l.c. xxi (1889) 83. 
