Naias.] cliv. naiadace^e. 3&7 
lapping edges, upper edge truncate, shoulders broad rounded with 
io teeth. Flowers solitary. Male and female on the same shoot. 
Male sessile; spathe ellipsoidal ending in a cylindric neck with 
numerous spines at the mouth. Perianth fitting closely to the 
ellipsoidal 4-locular anther ending in two thickened lips. Achene 
with 30 rows of small hexagonal pits. Hab. Singapore, in ditches 
at Tanglin (Ridley). Disirib. Andamans and Tonkin. 
Order CLIVa. POTAMOGETONACE/E. 
Aquatic submerged herbs. Flowers uni- or bi-sexual terminal, 
very small. Perianth usually absent. Anthers several, sessile. 
Carpels free, 1 to 4. 
1 . RUPPIA, Linn. 
Submerged aquatic plant with very slender branches. Leaves 
filiform narrow; sheaths stipule-like. Flowers minute, 2 to 6 on 
a short peduncle from the leaf-sheath. Perianth none. Anthers 2, 
sessile, opposite, 2-celled. Carpels 4, i-ovuled; stigma sessile. 
Achenes beaked ovoid (or blunt) borne on lengthened pedicels, the 
peduncle lengthening straight (or spiral) in fruit. Species I, whole 
world usually in brackish or salt water. 
(1) R. maritima Linn. Sp. PL 127 ; Ic. FI. Germ. vii. 1 .17 ; Hook . 
fil.F.B.I. vi. 568; Griff. Notnlce, iii. 196; Ic. Pl. As. t. 257-259. 
(Fig. 208, p. 366.) 
Stem creeping at base up to 2 ft. long, very slender. Leaves 
alternate 1 to 3 in. long, very narrow, dark blackish green. Peduncle 
straight in fruit, 1 to 6 in. long. Achene brown, ovoid, beaked, 
•08 in. long. Hob. Rice-land. Province Wellesley. Prai (Burkill). 
Disirib. Europe and Asia, Africa, America, Australia. 
Order CLV. FLAGELLARIACEiE. 
Climbing shrubs, or terrestrial or aquatic herbs. Leaves many 
nerved; petioles sheathing. Flowers small in terminal panicles, 
uni- or bi-sexual. Sepals 3, imbricate. Petals little longer. 
Stamens 6, hypogynous; anthers basifixed. Ovary superior, 
3-celled. Style long or short. Stigmas 3. Fruit a drupe or 1- to 
3-seeded berry. 
Flowers bisexual; stem woody climbing by cirrhose 
leaves.1. Flagellaria 
Flowers unisexual; stems erect reed-like, hollow . 2. Joinvillea 
Flowers unisexual; stem herbaceous; leaves large . 3. Susum 
1 . FLAGELLARIA Linn. 
Stem slender. Leaves sessile, narrow lanceolate (or broad) 
ending in a cirrhose point by which it climbs. Panicles lax. 
Flowers small, white, bisexual. Seeds 1 or 2. Species 4 > one 
Polynesian, rest Old World tropics. 
