200 CL. AROIDEA (BROWN). [ Raphidophora. 
2. R. africana, V. £. Br. in Kew Bulletin, 1897, 286. Stem 
moderately stout, about 4—} in. thick, rooting at the nodes, climbing to 
a height of 80-100 ft. Leaves glabrous; petiole 6-12 in. long, sheath- 
ing for the greater part of its length, thickened at the apex ; blade 
8-21 in. long, 21-42 in. broad, obliquely elongate-oblong-lanceolate, 
acuminate, cuneate at the base; lateral veins numerous, parallel, 
ascending, slightly curved. Peduncles 3-5 in. long, 2 lin. thick, arising 
near the apex of the branches, in the axils of membranous lanceolate 
acute bracts, glabrous. Spathe 33-4} in. long, in the convolute ee 
cylindric, }—1 in. in diam., produced into a stout beak about an ine 
long, not seen expanded, very deciduous, white. Spadix sessile 24-3} . 
long, } in. thick, cylindric, obtuse. Ovary imperfectly 2-celled ; oe 
very short and inconspicuous ; stigma subquadrate, or elongated paralle 
to the axis of the spadix. Ovules several, ascending from near the 
base of the placentas. 
__ ‘Upper Guinea. Sierra Leone: near Kurusu, Scott-Elliot, 5524! on humus 
of wood by a stream near Sakuru, Scott-Elliot, 4940! Ashanti: Assin- Yan- 
Coomassie, Cummins, 47! Fernando Po, Mann, 103! 
OrpeR CLI. LEMNACEZA. (By N. E. Brown.) 
Flowers seated in a cavity at the margin or in the upper surface of 
the frond, consisting of 1-2 stamens accompanied by a sessile ovary, 
either naked or enclosed in a membranous spathe (or perianth ?), which 
ruptures irregularly as the stamens mature. Stamens exserted from 
the frond; filaments filiform; anthers 1-2-celled; cells subglobose, 
opening by transverse lateral or terminal slits. Ovary narrowed into 
a style or with a subsessile stigma, 1-celled; placenta basal; ovule 
solitary or several in an ovary, anatropous, semi-anatropous, or ortho- 
tropous. Fruit 1- to several-seeded, indehiscent or opening trans- 
versely, Seeds minute, albuminous; embryo straight, axile.—Small or 
minute, gregarious, floating plants, consisting of suborbicular, elliptic, 
obovate, oblong or linear fronds of cellular tissue, with or without 
rudimentary vessels, usually 2 or more fronds connected together as 
one plant, flat on both sides or more or less convex beneath, sometimes 
as thick as broad, developing young fronds (which remain attached to 
the parent frond for some time) from a cavity (bud-cavity) or cavities 
placed near or at the basal end of the frond, rootless, or producing one 
or more roots from the middle of the undersurface. 
Genera 2, Species about 28. Found in all warm and temperate countries, 
floating on still water. For complete accounts of this Order see Hegelmaier, Die 
Lemnaceen, and in Engler Jahrb. xxi, 268. 
Frond with 1 or more roots. Flowers seated in a 
cavity at the margin of the frond : a . 1. LEMNA. 
Frond rootless, Flowers seated in a cavity in the 
upper surface of the frond ‘ ws sate ab) 2; WonrPile 
