158 HALORAGES. [Callitriche. 
A genus of very doubtful affinity, now often placed in the vicinity of the 
EHuphorbiacee. The species are estimated at from 1 or 2 to 20 or 30, according 
to the different views of authors. 
Fruits not winged, edges almost obtuse, groove between the 
carpels shallow AX ae 5: Se .- 1. C. antarctica. 
Fruits slightly winged, edges sharply keeled, groove 
between the carpels rather shallow .. - 2. C. verna. 
Fruits broadly winged, wings Paley groove between the 
carpels deep a : a 5: -. 38. C. Muellert. 
Fe ba antarctica, Lingelm. ex Hegelm. in Verh. Bot. Ver. Bran- 
denb. (1867) 20.— Stems creeping and rooting, rather stout, 
apeenleet densely matted, 2-6in. long. Leaves. fleshy, 4-4 in. 
long, narrow obovate-spathulate or oblong-spathulate, rounded at 
the tip, narrowed into a rather long petiole. Fruit sessile, broadly 
oblong or almost orbicular, somewhat turgid, not winged, the 
edges subacute or almost obtuse, separated by a shallow groove, so 
that each pair of lobes is united by almost three-quarters of their 
faces. — Kidder in Bull. U.S. Nat. Mus. ii. 23; Kirk, Students’ Fl. 
156. OC. verna, var. b terrestris, Hook. f. Fl. Antarct. i. 11. 
THE SNARES, AUCKLAND AND CAMPBELL ISLANDS, ANTIPODES ISLAND, 
Macquarie Istanp: Not uncommon on damp soil. Also found on Kerguelen 
Island, the Falkland Islands, and South Georgia. 
2. C. verna, Linn. Fl. Suec. ii. n. 3.—Usually floating in still 
water. Stems slender, sparingly branched, 3-12in. long. Leaves 
4-3in. long, linear-spathulate or oblong-spathulate or obovate, 
rounded or retuse at the tip, very thin and membranous. Fruit 
sessile, rather longer than broad, subcordate, somewhat convex, 
edges shortly and acutely keeled, groove between the lobes rather 
shallow.—Hook. 7. Fl. Nov. Zel. i. 64; Handb. N.Z. Fl. 68 (in 
part); Kirk, Students’ Fl. 156. 
NortH anp SoutH Istanps: Not uncommon in streams and lakes through- 
out. An abundant plant in many temperate countries. 
3. C. Muelleri, Sond. in Linnea xxvii. (1886) 229.— Stems 
filiform, 2-9in. long, much branched and interlaced, forming broad 
matted patches on damp soil. Leaves obovate-rhomboid or 
broadly obovate-spathulate, cuneate at the base, suddenly narrowed 
into a distinct petiole. Fruit orbicular- obcordate, often broader 
than long, flattened, margins expanded into a broad pale wing, 
groove between the lobes deep. —Kirk, Students’ Fl. 156. C. yerna 
var. b, Hook. f. Fl. Nov. Zel i. 64, C. macropteryx, Hegelm. 
Monog. Callit. 59, t. iv. f. 2. C. microphylla, Col. in Trans. N.Z. 
Inst. xx. (1888) 190. 
KermapgEc Is~tanps, NortH AnD SoutrH Istanps, Stewart IsLanp, 
CHaTHAM Is~tANDS: Common from the North Cape southwards. Sea-level 
to 2500 ft. Also in Australia. 
