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agrimony

(Encyclopedia)agrimony ăgˈrĭmōˌnē [key], any plant of the genus Agrimonia, perennials of the family Rosaceae (rose family) native to north temperate zones, to Brazil, and to Africa. They are found wild in the...

ageratum

(Encyclopedia)ageratum ăjˌərāˈtəm, əjĕrˈə– [key] [Gr.,=unaging], any plant of the genus Ageratum, tropical American annuals of the family Asteraceae (aster family). The commonly cultivated species is th...

Blakeslee, Albert Francis

(Encyclopedia)Blakeslee, Albert Francis, 1874–1954, American botanist, b. Genesee, New York. He received his Ph.D. at Harvard (1904) and was a member of the faculty until 1907. After several years as professor at...

watermelon

(Encyclopedia)watermelon, plant (Citrullus vulgaris) of the family Curcurbitaceae (gourd family) native to Africa and introduced to America by Africans transported as slaves. Watermelons are now extensively cultiva...

Lycopodiophyta

(Encyclopedia)Lycopodiophyta līˌkōpōˌdēŏfˈətə [key], division of the plant kingdom consisting of the organisms commonly called club mosses and quillworts. As in other vascular plants, the sporophyte, or s...

acacia

(Encyclopedia)acacia əkāˈshə [key], any plant of the large leguminous genus Acacia, often thorny shrubs and trees of the family Leguminosae (pulse family). Chiefly of the tropics and subtropics, they are cultiv...

marine engine

(Encyclopedia)marine engine, machine for the propulsion of watercraft. The earliest marine power plants, reciprocating steam engines, were used almost exclusively until the early 1900s. In later ship construction t...

hemp

(Encyclopedia)hemp, common name for a tall annual herb (Cannabis sativa) of the family Cannabinaceae, native to Asia but now widespread because of its formerly large-scale cultivation for the bast fiber (also calle...

incense-tree

(Encyclopedia)incense-tree, common name for members of the Burseraceae, a family of sometimes deciduous shrubs and large trees found chiefly in tropical America and NE Africa. The name derives from the characterist...

Nematoda

(Encyclopedia)Nematoda nĕmˌətōdˈə [key], phylum consisting of about 12,000 known species, and many more predicted species, of worms (commonly known as roundworms or threadworms). Nematodes live in the soil an...