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A genus of trees of the Olive family, having opposite pinnate leaves, many of the species furnishing valuable timber, as the European ash (Fraxinus excelsior) and the white ash (F. Americana). Prickly ash (Zanthoxylum Americanum) and Poison ash (Rhus venenata) are shrubs of different families, somewhat resembling the t…

A genus of large and voracious two-winged flies, including the bee killer and robber fly.

A genus of plants of the natural order Leguminosæ. The species are chiefly natives of the Cape of Good Hope.

A genus of perennial plants belonging to the natural order Liliaceæ, and having erect much branched stems, and very slender branchlets which are sometimes mistaken for leaves. Asparagus racemosus is a shrubby climbing plant with fragrant flowers. Specifically: The Asparagus officinalis, a species cultivated in gardens.…

A general name for a plant of the genus Asphodelus. The asphodels are hardy perennial plants, several species of which are cultivated for the beauty of their flowers.

A quadruped of the genus Equus (E. asinus), smaller than the horse, and having a peculiarly harsh bray and long ears. The tame or domestic ass is patient, slow, and sure-footed, and has become the type of obstinacy and stupidity. There are several species of wild asses which are swift-footed.

A genus of crustaceans, containing the crawfish of fresh-water lobster of Europe, and allied species of western North America. See Crawfish.

A genus of bivalve mollusks, common on the coasts of America and Europe.

A genus of herbs with compound white or bluish flowers; starwort; Michaelmas daisy.

A genus of echinoderms.

A genus of fishes, some of which were eighteen or twenty feet long, found in a fossil state in the Old Red Sandstone. Hugh Miller.

Pertaining to the genus Astræa or the family Astræidæ. -- n.

A genus of papilionaceous plants, of the tribe Galegeæ, containing numerous species, two of which are called, in English, milk vetch and licorice vetch. Gum tragacanth is obtained from different oriental species, particularly the A. gummifer and A. verus.

A genus of ophiurans having the arms much branched.

A genus of American monkeys with prehensile tails, and having the thumb wanting or rudimentary. See Spider monkey, and Coaita.

A genus of small glassy heteropod mollusks found swimming at the surface in mid ocean. See Heteropod.

A extinct genus of Branchiopoda, very common in Silurian limestones.

A genus of jellyfishes. See Discophora.

A genus of air-breathing mollusks mostly found near the sea, where the water is brackish

A genus of grasses, including the common oat (Avena sativa); the oat grasses.