OF INDIA AND CEYLON. 
205 
hairy on the upper surface ; axis in most forms elongating 
only towards the flowering season, when the leaves usually 
enlarge at the bases to form, bracts, whose leafy tips fall off. 
Flowers usually terminal, on the thallus apices in Lawia, on 
the secondary shoots in the other genera, enclosed in 
spathes in the achlamydeous forms, one or more on each 
shoot, sessile or pedicellate, usually not opening till exposed 
to the air. 
FI. regular. Perianth (3). Stamens 3. 
G (3) ... ... GHLAMYDATÆ. 
zygomorphic, naked. Stamens (1- 
3). G (2) ... ... ACHLAMYDATÆ. 
GHLAMYDATÆ-^ 
Thallus a thread-like creeping 
root ; secondary shoots long, 
complexly branched, freely 
floating, bearing ramuli or 
moss-like shoots of limited 
growth. Floral axis sub- 
tended by few leaves, some- 
times slightly connate ... Tristicha. 
Thallus frondose, foliiferous, 
creeping, closely attached to 
rocks ; secondary shoots 
of small rosettes of leaves 
on upper side of thallus. 
Floral shoots arising from 
axial cupules ... Lawia. 
AGHLAMYDATÆ (all belong to 
Eupodostemeæ) — 
Fruit ribbed, iso- or aniso-lobous, 
dehiscent, with co seeds. Spathe 
erect, more or less cylindrical, 
opening at apex by several teeth. 
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