208 
WILLIS : PODOSTEMÂCBÆ 
or ramuli, consisting of a delicate axis with qo small leaves, often 
3-stichous. Flowers terminal on pedicels subtended by 2-3 large 
or several ordinary leaves, in the latter case the upper ones more 
or less united. Pedicel and ovary with deciduous cortex, which 
shrivels after flowering. Flowers small, usually (?) emerging through 
the water at the beginning of dry season. 
Cosmopolitan tropical. South America, Mexico, Africa. 
Madagascar, India. 
§1. Dalzellia, { Wight) (as genus). Stamens 3. 
Leaves of ramuli not tristichous. Flower subtended by 
several ordinary leaves, the upper united. India. 
1. T. ramosissima, ( Wight) Willis, 
§2. Eutristicha, Willis. Stamen 1. Leaves of ramuli 
more or less tristichous. Flower subtended by two or three 
larger leaves. America, Africa. 
2. T. hypnoides, Spr. 
3. T. alternifolia, TuL 
TRISTIGHA RAMOSISSIMA, (Wight) Willis ; Lawia 
ramosissima, Warming, in Engl. Prtl. Nat. Pflanzenfam., 
O. Kuntze ; Terniola ramosissima, Wedd., in DC. Prodr. 
Dalzellia ramosissima, Wight, Ic. PL As., p. 35, 1852 ; 
Tulasnea ramosissima Wight, 1. c., t. 1,920. 
Stamens 3. Ramuli not tristichous. Upper leaves of floral 
shoot connate. Stigmas 3, long, filamentous, hairy. 
Primary axis unknown (?). Roots cylindrical, filamentous, creeping, 
frequently branched, and attached to the rock by root hairs, haptera, or 
disc-like feet. Secondary shoots go , endogenous at the proximal ends 
of feet or haptera, floating freely in the water ; when fully developed 
large — to 25 cm. long— and frequently branched, but often represented 
only by a ramulus or a tuft of ramuli, or by a short 1 -flowered shoot. 
Leaves at apex of secondary axis small, narrow, simple, thin, in many 
ranks. Branches of two kinds, short branches or ramuli, developed 
first in the leaf axils, consisting of slender filiform axis of limited 
growth with co entire simple thin linear or filamentous leaves irregu- 
larly arranged, and long branches, developed later above the ramuli and 
