278 
VI. NAIADES. 
\Ltmna. 
1. L. minor, Linn.; — FI. N. Z. i. 239. Fronds ovate or oblong, green, 
about tV - T o i n - long, with a single capillary root. Flower not seen. 
Middle Island : Port Cooper, Lyall. Probably abundaut elsewhere (as throughout the 
world), but overlooked. 
2. la. gibba, Linn. ; — FI. N. Z. i. 289. Like L. minor , but frond con- 
vex below. Flower not seen. 
Northern Island : east coast, Colenso. Also a common plant in various parts of the 
world, but not so frequent as L. minor. Some of the Tasmanian specimens referred to L. 
minor in FI. Tasrn. are referable to this. Fronds of New Zealand and Tasmanian specimens 
are of the same size as those of L. minor , and much smaller than of English specimeds. 
2. TSIGLOCHm, Linn. 
Marsh herbs. Leaves all radical, filiform or rush-like, sheathing at the 
base. Scape naked, slender, bearing a terminal spike or raceme of small 
green flowers. — Flowers hermaphrodite, green, small, ebracteate. Perianth 
of 6, green, concave pieces in 2 series. Stamens 6; filaments very short; 
anthers bursting outwards. Ovaries 3 or 6, partially cohering ; stigma sessile ; 
ovule solitary, erect. Fruit of 3 carpels (or more, the alternate not ripening), 
separating from a central axis. Embryo straight, radicle inferior. 
A widely diffused, but not large genus, in the temperate zones of both hemispheres. 
1. T. trian&rum, Michaux ; — FI. N. Z. i. 236. A very slender, gla- 
brous herb, 3-10 in. high. Leaves filiform, grass-like, semiterete, as long 
as or longer than the scape. Flowers minute, green, pedicelled. Fruit glo- 
bose, of 3 keeled carpels, alternating with as many or fewer imperfect ones. 
Stigmas recurved. — 'l'.Jlaccidum, A. Gunn. ; T.Jili folium. Hook. 1c. PI. t. 579. 
Northern and Middle Islands: common in marshes, especially near the sea, Banks 
and Solander, etc. Also found in Australia, South Africa, and temperate North and South 
America. 
3. POTAMOG-ETON, Linn. 
Aquatic plants. Stems creeping, jointed and rooting. Leaves 2-ranked, 
usually alternate, all similar, or the lower narrow submerged, the upper 
broader floating ; stipules membranous, free or united and sheathing. Spikes 
on axillary peduncles. — Flowers hermaphrodite, green, small, ebracteate. 
Perianth of 4 concave pieces, valvate in bud. Stamens 4 ; filaments very 
short. Ovaries 4 ; stigmas sessile or subsessile ; ovule solitary, ascending. 
Fruit of 4 small drupe-like nuts, often compressed. Embryo curved. 
A large and very abundant genus in all parts of the world, the species of which are very 
variable. Much better specimens of the New Zealand species are wanted. 
Floating leaves oblong or lanceolate-oblong 1. P. natans. 
Leaves, lower linear, grass-like, upper floating, oblong, lanceolate, acute 2. P. heterophyllus. 
Leaves all narrow linear and grass-like. Stipules free, lacerate . . 3. P. gramineus. 
Leaves all very narrow linear. Stipules united with leaf-margins . 4. P. pectinatus. 
1. P. natans, Linn. ; — FI. N. Z. i. 236. Stems and branches long or 
short according to the depth of the water. Leaves on long petioles, floating, 
1-3 in. long, oolong, obtuse or acute, often subccrdate at the base, reddish- 
brown; submerged (if present) linear; stipules not winged, without ribs. Scape 
