Online Encyclopedia

Search over 40,000 articles from the original, classic Encyclopedia Britannica, 11th Edition.

ALISMACEAE (from the Gr. a us,aa, a w...

Online Encyclopedia
Originally appearing in Volume V01, Page 672 of the 1911 Encyclopedia Britannica.
Spread the word: del.icio.us del.icio.us it!

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:white or purplish petals, six to indefinite stamens and six to indefinite See also:free carpels . The floral arrangement thus recalls that of a See also:buttercup, a resemblance which extends to the fruit, which is a head of achenes or follicles . The flowers contain See also:honey, and attract flies, See also:short-lipped bees or other small See also:insects by the agency of which See also:pollination is effected . The fruit of Butomus is of See also:interest in having the seeds borne over the inner See also:face of the See also:wall of the leathery pod (follicle) . Damasonium derives its popular name, star-fruit, from the fruits spreading when ripe in the See also:form of a star .

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 .

End of Article: ALISMACEAE (from the Gr. a us,aa, a water-plant.mentioned by Dioscorides)
[back]
ALIRAJPUR
[next]
ARCHIBALD ALISON (1757-1839)

Additional information and Comments

There are no comments yet for this article.
» Add information or comments to this article.
Please link directly to this article:
Highlight the code below, right click and select "copy." Paste it into a website, email, or other HTML document.