126 | - NAIDACEAE, [ Triglochin. 
high; raceme elongating after flowering. Flowers numerous, shortly 
pedicelled, minute, green or greenish-purple. Perianth-segments ovate, all 
equal, Stamens 6, all fertile; anthers purple. Fruit appressed to the 
rhachis, linear-clavate, Lin. long; carpels 3, very slender, almost awned 
at the base, attached to the axis by the tip.—Cheesem. on Trans. N.Z. Inst. 
xiv (1882) 300; Man. N.Z. Fl. (1906) 747. ide ai 
Sourn Isnanp : Canterbury—Broken River, J. D. Enys and T. F. (.; Rangitata 
Valley, Haast! Lake Tekapo and Tasman Valley, 7. F.C. Otago— phir, Black's, 
Petrie ! 2000-3000 ft. December—January. 
A plant with a wide distribution in the Northern Hemisphere, aiso found in 
extratropical South America, but not yet detected in Australia. 
/ ‘ , sh 
i 
2. POTAMOGETON Linn. 
Perennial aquatic herbs. Stems slender, simple or branched. Leaves 
wholly submerged and translucent, or floating and opaque, alternate or 
opposite, entire or toothed; stipules intrafoliar, free, or adnate to the 
petiole or base of the leaf. Flowers small, green, hermaphrodite, ebracteate, 
sessile in a dense spike on an axillary peduncle arising from a membranous 
spathe. Perianth-segments 4, small, herbaceous, concave, valvate. Sta- 
mens 4, inserted at the base of the segments; anthers sessile, 2-celled, 
extrorse. Carpels 4, sessile, distinct, 1-celled; stigma oblique, decurrent ; 
ovules solitary, affixed to the inner angle of the cell, campylotropous. 
Ripe carpels or drupelets 4, small, coriaceous or spongy, ovoid or sub- 
globose, obtuse or beaked by the recurved persistent stigma, 1-seeded. 
Seed curved, reniform; testa membranous; embryo with a large radicle 
and narrow incurved cotyledon. ) 
A genus widely spread in the fresh or brackish waters of almost all temperate or 
subtropical regions, more rare in the tropics. Species variously estimated at from 
40 to 100 or m YT, ae . 
and most difficul 
sought for, and 
herein. 
A. Floating leave 
shape from t 
Floating leaves £ 
wanting or r 
keeled on the > 
Floating leaves 
leaves few, lir 
on the back 
Floating leaves 
Fruit small, 4 
B. Leaves all sub 
Leaves 1-4 in. b 
lacerate. Spik 
Leaves 2-4 in. by 
adnate. Spike \, 
1. P. natal 
or short, sim} 
petioles ; lam 
~- 
acute or subac ‘eae an 
90—30-nerved ywWiocws CU pi tee Seteis o ASE ete re ee vs 8 5 mbes q 7 pules 
very long and conspicuous, 3-5in., free, acuminate. Submerged leaves 
