Sagittaria.'] 
C. JUNCAGINACEJE. 
471 
in often proliferous umbels ■ but the essential character is in the fruit. 
The var. f): at first appears to be very different, having runners, and 
the flowers are solitary on long simple radical peduncles ; but these 
runners are the true scapes, the umbels having taken root, and thrown 
out a few leaves. 
3. A. nutans L. ( floating W.) ; radical leaves linear acu- 
minate sessile, floating ones elliptical obtuse, stem floating and 
rooting leafy, peduncles simple from the joints of the stem, 
heads of fruit globose, achenes rostrate with 12 — 15 slender 
ribs. E. B. t. 775. 
Lakes in North Wales and Cumberland. Very rare in Scotland: 
Black Loch, 6 miles from Stranraer. On Howth and in Connemara 
Ireland. Jf.. 7,8. — At the base of the plant are long, linear- 
lanceolate, membranous scales, or root-leaves reduced to mere petioles. 
Stem-leaves floating, on long stalks, scarcely nerved. Achenes obliquely 
oblong, compressed at the side, with many striae, slightly spreading, 
pointed with the short persistent style. 
3. Sagittaria Linn. Arrow-head. 
Monoecious. — Barren fl. 'Siam, numerous. — Fertile fl. 
Styles many. Achenes very numerous, distinct, collected into a 
head , 1 -seeded, compressed, margined. — Named from sagitta, 
an arrow , on account of the shape of its leaves. 
1. S. sagillifdlia L. ( common A.) ; leaves arrow-shaped, the 
lobes lanceolate straight, scapes simple with whorled simple 
short branches. E. B. t. 84.^ 
Ditches and margins of rivers in England and Ireland. Near Glas- 
gow, in various places, but scarcely indigenous. Tf. . 7 — 9. — Flowers 
white. Leaves truly arrow-shaped, rising above the surface of the 
water. Runners are thrown out from the base of the plant, each 
terminating in a tuberous rhizome. 
*** Perianth none or inconspicuous. Nerves of leaves usually 
longitudinal. (Okd. C. — CV.) 
•j- Plants sometimes , though rarely , aquatic , never ( except Spar- 
ganium natans) submerged or floating. (Ord. C. — CIII.) 
Ord. C. JUNCAGINACEiE Rich. 
Flowers perfect, lower ones are all stalked or reflexed. 
Perianth uniform, rarely none, sometimes coloured but scarcely 
petaloid. Stamens hypogynous. Anthers extrorse. Ovaries 
united or distinct. Ovules solitary or two, approximate at the 
base, erect, anatropal. Styles or stigmas 3 — 6. Pericarps in- 
dehiscent or 2-valved. Albumen 0, Embryo straight, with a 
lateral cleft for the emission of the plumule ; radicle next the 
