Myriophyllum.} HALORAGEZL. 473 
Order LI. HALORAGEZ. 
Herbs or undershrubs, rarely annual, often aquatic. Leaves 
site or whorled, sometimes partly alternate, the submerged 
leaves often pectinate; stipules 0. Flowers hermaphrodite or 
l-sexual, small, sometimes incomplete, usually axillary, solitary 
or fascicled, usually sessile ; whorls sometimes spicately aggre- 
d. Disk epals connate in a calyx, with tube adnate to 
ovary ; lobes 2, 4, or 0, or imperfect in ¢ flowers. Petals 2, 4, or 
0, concave, deciduous, valvate or slightly imbricate, epigynous. 
2-, or 1-locular, compressed or angled; styles 4, 2, or 1, fimbriate 
or simple; ovules 4, 2, or 1, pendulous from apex of loculus. 
Fruit small, dry or drupaceous, 4-, 2-, or 1-celled, indehiscent or 
Separating into indehiscent 1-seeded cocci. Seeds pendulous ; 
testa membranous; albumen fleshy; embryo axial, cylindric. 
318. Myriophyllum Linn. 
Glabrous aquatic herbs with floating stems; leaves whorled, 
rarely alternate, dentate, serrate, or the submerged ones pectinate, 
Pinnatifid, rarely entire. Flowers small, sessile, or subsessile, 
in upper leaves or in nearly naked terminal spikes ; 
Moncecious or hermaphrodite. ¢ Sepals connate in a short tube ; 
limb 4-, rarely 2-lobed, sometimes obsolete. Petals 2 or 4, con- 
cave, sessile. Stamens 2, 4, or 8 (in our species always 4). ¢ 
. plumose ; ovules solitary, pendulous in each chamber. Fruit 
‘fwrowed nut or drupe, sometimes separating into 4, rarely 2 
oak - Seeds pendulous, cylindric-oblong ; testa membranous ; 
Fyo cylindric, central in the copious albumen. 
Flowers pink ; stigmas pink, much fimbriate ; fruits acutely ridged along 
backs, both ridges and furrows beset by pointed tubercles 
tuberculatum. 
on white; stigmas green, little fimbriate; fruits with rounded 
carpel backs, puberulous or glabrous, tubercled or not 
indicum 
