430 THE NAIAD FAMILY. [Schewchzeria, 
Asia, and North America, and here and there in the mountains of central 
Europe. In Britain, only in northern England, in Shropshire, and 
Methuen, near Perth. Jl. summer, rather early. 
» VII. TRIGLOCHIN. ARROW-GRASS, 
Tufted herbs, with linear, semi-cylindrical radical leaves, and leafless 
flower-stems, bearing a slender raceme or spike of small greenish flowers 
without bracts. Perianth of 6 nearly equalsegments. Stamens6. Ovary — 
and fruit of 3 or 6 1-seeded carpels, each bearing a separate, small, 
feathery stigma, all united at first round a central axis, but separating 
from it when ripe. 
A small genus, chiefly maritime, but widely distributed over the globe. 
Ripe fruit linear, with 3 carpels : 3 ‘ ; . 1. T. palustre. 
Ripe fruit ovoid or oblong, with 6 car pels : : ; . 2 T. maritimum. 
1, T. palustre, Linn. (fig. 970). Marsh a —The tufted stock emits 
a few slender, creeping runners. Leaves slender, but rather succulent, 
varying from 2 to 8 inches in length, dilated and sheathing at the 
base. Flower-stems from 6 to 12 inches high, bearing in their upper 
half a slender spike of small, yellowish-green flowers, which are at first 
sessile, but as the fruiting advances the pedicels lengthen to 1 or 2 lines, 
Perianth-segments broadly ovate, the feathery stigmas just appearing 
above them. After they fall off, the fruit lengthens to about 3 lines by 
less than a line broad, tapering at the base ; when ripe it separates from 
the base upwards into 3 carpels, leaving a central axis. 
In wet meadows, and marshes, and on the shallow edges of streams, 
more especially in maritime districts, in Europe, central and Russian 
Asia, and North America, extending from the Mediterranean to the 
Arctic regions. Common in Britain. 7. all summer. 
2, T. maritimum, Linn. (fig. 971). Sea A.—Very near 7. palustre, 
but usually rather stouter, with more succulent leaves, the flowers nearly 
similar ; but even in that state the ovary is broader, with 6 cells, and 
the ripe fruit is not more than 2 lines long, more than a line broad, and 
divides into 6 carpels. 
Generally more restricted to the vicinity of the sea than 7. palustre, 
but equally abundant with that species in the salt marshes of the 
northern hemisphere. Common in Britain, Fl. from spring tall autumn. 
LXXIX. ALISMACEA. THE ALISMA FAMILY, 
Marsh or water plants, with radical leaves and leafless flower- 
stems. Flowers in terminal umbels, panicles, or racemes. 
Perianth of 6 segments, either all similar, or 3 outer sepal-like 
and 3 inner ones larger and petal-like. Stamens 6, 9, or inde- 
finite. Ovary of 3, 6, or many carpels, either distinct from the 
first or separable when in ripe fruit, each with 1, 2, or many ~ 
ovules. Seeds consisting, within the testa, of a large, im 
or hooked embryo without albumen. ; 
