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See also:ALISMACEAE (from the Gr. a us,aa, a See also:water-plant.mentioned by Dioscorides)
, in See also:botany, a natural See also:order of monocotyledons belonging to the See also:series Helobieae, and represented in See also:Britain by the See also:water See also:plantain, Alisma Plantago, the arrow-See also:head, Sagittaria, the See also:star-See also:fruit, Damasonium, and flowering See also:rush, Butomus (from the Gr
.
(3ous, ox, 'riAveW, to cut, in allusion to leaves cutting the See also:tongues of oxen feeding on them)
.
They are See also:marsh- or water-See also:plants with generally a stout See also:stem (rhizome) creeping in the mud, See also:radical leaves and a large, much branched inflorescence
.
The leaves show a See also:great variety in shape, often
on the same plant, according to their position in, on or above the water
.
The submerged leaves are See also:long and grass-like, the floating leaves oblong or rounded, while the aerial leaves are See also:borne on long, thin stalks above the water, and are often See also:heart- or arrow-shaped at the See also:base
.
The See also:flower-bearing stem is tall; the See also:flowers are borne in whorls on the See also:axis as in arrow-head, on whorled branchlets as in water plantain or in an umbel as in Butomus (fig
.
1)
.
The flowers are See also:regular and rather showy, generally with three greenish sepals, followed in regular See also:succession by three See also: It is a western S Mediterranean plant which spreads to the See also:south of See also:England, where it is sometimes found in gravelly ditches and pools . The order contains about fifty See also:species in fourteen genera, and is widely distributed in temperate and warm zones . Alisma Plantago (fig . 2), a See also:common plant in Britain (except in the See also:north) in ditches and edges of streams, is widely distributed in the north temperate See also:zone, and is found in the Himalayas, on the mountains of tropical See also:Africa and in See also:Australia . |
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