The Coneflower reference article from the English Wikipedia on 24-Apr-2004
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Coneflower

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Coneflower is a flowering plant in Family Asteraceae that is a member of genus Rudbeckia. The disk flowers show a cone-like form that often persists after the ray flowers are lost. These annual or perennial plants are also called Gloriosa daisies or Black-eyed susans. Some species have been developed into popular cultivars. The genus is native to North America and has about six species (the actual number is controversial). Many other species assigned to this genus are often cultivars. Other plants called coneflower belong to other genera.

R. fulgida - Orange coneflower, Black-eyed susan.
R. hirta - Black-eyed susan, Gloriosa daisy, Yellow ox-eye daisy.
R. laciniata - Green-headed coneflower.
R. lanceolata -
R. serotina -
R. speciosa - Showy coneflower.
R. subtomentosa - Sweet coneflower.
R. triloba - Thin-leaved coneflower.