Myriophyllum.| HALORAGES. 151 
A widely distributed genus of from 15 to 20 species, found in fresh waters 
in nearly all parts of the world. One of the New Zealand species is endemic, 
the rest extend to Australia, and one to South America as well. 
Leaves whorled ; Jower pectinately pinnatifid, with capil- 
lary segments ; upper oblong, entire 1. M. elatinoides. 
Leaves whorled ; lower pectinately pinnatifid, with capil- 
lary segments ; upper linear, entire or serrate 2. M. intermediun. 
Leaves whorled, all pectinately pinnatifid. Nuts large, 
tubercled 3. M. robustum. 
Minute, 1-3 in. All the leaves opposite, minute, linear- 
spathulate, entire . Mi ot -. 4. M. pedunculatum. 
1. M. elatinoides, Gaud. in Ann. Scr. Nat. Ser. i. 5 (1825) 105. 
—Forming dense masses in still waters. Stems slender, 6in. to 3it. 
long according to the depth of the water. Submerged leaves in 
whorls of 4, rarely more, deeply pectinately pinnatifid, the segments 
capillary ; the upper emerged or floral leaves in whorls of 4 or 3, 
sometimes opposite, much smaller, +-tin. long, ovate or oblong 
to broadly lanceolate, sessile, obtuse, entire or the lower slightly 
toothed. Male flowers:  Calyx-lobes very minute. Petals 4, ob- 
long. Stamens 8. Females: Calyx-lobes and petals apparently 
wanting. Nuts 4, small, oblong, smooth.—Hook. f. Hl. Nov. Zel. 1. 
63; Handb. N.Z. Fl. 66; Benth. Fl. Austral. ii. 487; Kirk, Stu- 
dents’ Fil. 150. 
NortH Aanp SoutH IsLANpDs, STEWART ISLAND: Common in rivers and 
lakes from the Auckland Isthmus southwards, ascending to 3500 ft. Novem- 
ber—February. Also in Australia and extra-tropical South America. 
Subalpine specimens are stouter, with less delicate and more closely set 
submerged leaves, and the nuts are rather larger. 
2. M. intermedium, D.C. Prodr. in. 69. — Very variable in 
habit: in lakes and rivers forming masses of floating stems 1—4 ft. 
long, with numerous submerged leaves ; in wet ground sometimes 
only an inch or two high, with the leaves all linear and entire. 
Leaves in whorls of 3-8, usually 4-5; submerged leaves deeply 
and finely pectinately pinnatifid, segments capillary; upper 
emerged or floral leaves much smaller, 14in. long, lanceolate 
and inciso-pinnatifid to narrow-linear and quite entire. Male 
flowers: Calyx-lobes evident. Petals white. Stamens 8. Female 
flowers: Calx-lobes and petals apparently wanting. Nuts 4, very 
small, linear-oblong, usually minutely scabrid or almost Schinate. 
rarely quite smooth.—M. variefolium, Hook. f. in Hook. Ic. Plant. 
t. 289; Fl. Nov. Zel. i. 64; Handb. N.Z. Fl. 66; Benth. F1. 
Austral. ii. 487; Kirk, Students’ Fl. 150. M. propinquum, A. Cunn. 
Precur. n. 532. 
NortH anp SoutH Isntanps, Stewart Isuanp: Abundant in lakes and 
streams, wet swamps, &c., from the North Cape southwards, ascending to 
3000 ft. December—March. Also in Australia, Malaya, and India. 
3. M. robustum, Hook. f. Handb. N.Z. Fl. 67.—Stems stout, 
erect, branched at the base, 6in. to 2 ft. high, rarely more. Leaves 
