Rudbeckia
Genus of about 20 species of annuals, biennials, and perennials with short rhizomes, from moist meadows and light woodland in Norther America.

They have branched or unbranched stems, and most have alternate, simple to pinnatifid, occasionally pinnate, prominently veined leaves, toothed towards the tips. Usually solitary daisy-like flower heads, often with reflexed yellow ray-florets and conical centres consisting of black, brown or green disc -florets, are borne on long stems over a long period from summer to autumn. Most are good for cut flowers. Grow in a border, or naturalise in a meadow or woodland garden.

Source: The Royal Horticultural Society "A-Z Encyclopedia of Garden Plants, K-Z", page 939

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