Rudbeckia is a plant genus of 23 species, commonly called ‘Coneflowers’ and ‘Black-eyed-susans’. They are native to North America (‘prairie plants’) and are cultivated for their showy flower heads of yellow andorange, with a dark centre seed head, but there are also russet, bronze and mahogany tones. Mainly herbaceous perennials, some are annual or biennial.
They grow to between 0.5m and 3m tall, with simple or branched stems. The leaves are spirally arranged, and are between 5cm and 25 cm long. The flowers are daisy-like, with yellow or orange florets arranged in a prominent, cone-shaped head; “cone-shaped” because the ray florets tend to point out and down as the flower head opens.
A large number of species have been proposed within Rudbeckia, but most are now regarded as synonyms of a more restricted list. Several of these currently accepted species have a number of accepted varieties…
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