273 
SAGITTARIA HETEROPHYLLA Pursno IN DEVON. 
By W. P. Hiern, M.A., F.RB.S, 
(Puatr 494.) 
In the river Exe, in and near Exeter, I found in July of the 
present year, in considerable quantities, a plant with its handsome 
foliage much resembling that of Alisma Plantago-aquatica, but 
with its inflorescence quite ee — that genus, and yet 
errs: jiewe ng es the family Alismatacee 
After careful examination it was gone _ the th 
was dicesions or eso 2 that the stamens of the e flowe 
and that the flowers were mostly arranged in whorls of three. 
enus Sagittara i 
is sufficiently different in appearance from the British pens 
sagittifolia L.; the leaves are not at all arrow-shaped, the 
nner segments of the perianth are without a dark violet cr 
of colour at the claw, and the flowering-scapes fall short of the 
fe) 
oe fo ollowing is a detailed description, taken from fresh or 
living specimens, as they grew in the running waters of the 
river Exe. 
A perennial _— aquatic, partly or in its early stages wholly 
immersed, erect, succulent, rigid, glabrous, rather glossy, acaule- 
scent, selante cae gregarious, moncecious or diccious, densely 
leafy at the base, rooting in the mud, 3-9 dm. high; rootstock 
thick, densely fibrous at the base with numerous whitish rather 
thick fibres and long and thinner branched fibrils; stolons si 
quent, terete, more or less horizontal, ranging up 
iameter; leaves n , radical, erect or we 
erect, anak _ show attaining the full height of the plant, a few 
of them s sublinear and reduced to the form of phyllodes; 
petioles frm, rit sappy, spongy within, longitudinally veined 
and more or less marked with slender transverse dark lines, above 
somewhat eran triangular and more or less 3-win ow 
rounded turgid and narrowly keeled at the back, laterally 9-winged 
especially towards the base, imbricate and clasping so as together 
“2 — at the base a close tuft 3-10 em. in diameter, somewhat 
ing above, ranging up to 74 dm. long or rather more; 
iarnte of the fully- developed leaves oval or very crys ovate, 
a pointed at the apex, rounded or nearly so at the base, 
quite entire and not at all ee succulent-membranous, not 
; C 
especially beneath; lateral veins 4 or 5 on each side of the midrib, 
adi ding at or near to the base of the midrib to or towards the 
argin of the leaf, the outer ones gradually weaker; transverse 
ae numerous, oblique, very weak; scapes comparatively few, 
Journan oF Botany.—Vou. 46. ([Sepr., 1908.) U 
