154 THE @NOTHERA FAMILY. [ @nothera. 
less hairy; leaves ovate-lanceolate or lanceolate, slightly toothed, hoary or 
downy. Flowers yellow, large, and fragrant, in a long, terminal spike, 
often leafy at the base. Ovary sessile, about 6 to 8 lines long, the tube of 
the calyx at least an inch longer, the petals broad and spreading. Capsule 
oblong. 
A North American plant, long cultivated in European flower-gardens, 
and now naturalized on river banks and other sandy places in several parts 
of western Europe. Appears to be fully established in Lancashire and 
some other counties of England, 7. summer and autumn, opening in the 
evening. P 
on odorata, Jacq., which has linear-lanceolate waved leaves and a 
long cylindric capsule, is a Patagonian species, recently established on the 
S.W. coasts of England. | 
Ill. LUDWIGIA. LUDWIGIA. 
Marshy or almost aquatic herbs, with opposite leaves, and small flowers 
solitary in the axils of the upper leaves. Limb of the calyx of 4 short 
divisions. Petals very small, or, in the British species, none. Stamens 4. 
Ovary and capsule 4-celled. Style distinct, with a capitate stigma. Seeds 
numerous, without any tuft of hairs. 
The genus consists of a considerable number of species, widely diffused 
over the hotter as well as the temperate regions of the globe, in the new 
world as in the old. In their general habit and small flowers they resemble 
Peplis, and some other semi-aquatic Lythrariee, but the inferior ovary 
and some other characters are entirely those of Onagracee. . 
1. &. palustris, Ell. (fig. 351). Marsh Ludwigia.—A small glabrous 
annual, 3 to 6 inches high or rarely more; the lower part of the stem 
creeping in mud or floating in water, branching and rooting at almost every 
node, Leaves ovate and entire, 6 lines to an inch long. Flowers closely 
sessile, with a small green calyx, no petals, very small stamens, and an 
exceedingly short style, with a comparatively large capitate stigma. The 
capsule rapidly enlarges, being, when ripe, about 2 lines long, obovate, 
with 4 green angles, and containing numerous minute seeds. Jsnardia 
palustris, Linn. 
In wet ditches, bogs, and pools, in central and southern Europe, central 
Asia, and North America, not crossing the Baltic to the northward. In 
Britain only known hitherto in three localities in Hampshire and Sussex, 
and in Jersey. £0. summer. 
IV. CIRCAEA. CIRCA. 
Herbs, becoming perennial by creeping rootstocks from the base of the 
erect annual flowering stems, with opposite stalked leaves, and small 
flowers in terminal racemes. Limb of the calyx of two divisions, turned 
back whilst flowering. Petals 2. Stamens2. Style distinct, with a thick 
stigma. Ovary and capsule globular, pear-shaped, or oblong, 2- or 1-celled, 
with 1 seed in each cell. 
This pretty little genus consists of but three or four species, spread 
over Kurope, temperate Asia, and North America, all so nearly resembling 
eh other, that, in the opinion of some botanists, they are mere varieties 
of one. 7 
