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The Collaborative International Dictionary
Rudbeckia

Rudbeckia \Rud*beck"i*a\, n. [NL. So named after Olaf Rudebeck, a Swedish botanist.] (Bot.) A genus of composite plants, the coneflowers, consisting of perennial herbs with showy pedunculate heads, having a hemispherical involucre, sterile ray flowers, and a conical chaffy receptacle. There are about thirty species, exclusively North American. Rudbeckia hirta, the black-eyed Susan, is a common weed in meadows.

Wiktionary
rudbeckia

n. Any member of the genus ''Rudbeckia'' of coneflowers.

Wikipedia
Rudbeckia

Rudbeckia is a plant genus in the sunflower family. The species are commonly called coneflowers and black-eyed-susans; all are native to North America and many species are cultivated in gardens for their showy yellow or gold flower heads.

The species are herbaceous, mostly perennial plants (some annual or biennial) growing to 0.5–3 m tall, with simple or branched stems. The leaves are spirally arranged, entire to deeply lobed, 5–25 cm long. The flowers are produced in daisy-like inflorescences, with yellow or orange florets arranged in a prominent, cone-shaped head; "cone-shaped" because the ray florets tend to point out and down (are decumbent) as the flower head opens.

A large number of species have been proposed within Rudbeckia, but most are now regarded as synonyms of the limited list given below.

Several currently accepted species have several accepted varieties. Some of them (for example the Black-eyed Susan, R. hirta), are popular garden flowers distinguished for their long flowering times. There are many cultivars of these species.

Rudbeckia species are eaten by the caterpillars of some Lepidoptera species including Cabbage Moth and Dot Moth.

Usage examples of "rudbeckia".

Ononis rotundifolia, Onosma taurica, Orchis foliosa, Ourisia coccinea, Pentstemons, Physalis Alkekengi, Polygonum cuspidatum, Potentilla fructicosa, Pratia repens, Primula sikkimensis, Ramondia pyrenaica, Ranunculus aconitifolius flore-pleno, Rudbeckia californica, Saponaria ocymoides, Saxifraga longifolia, S.

Potentilla fruticosa, Pratia repens, Pyrethrum uliginosum, Rudbeckia californica, Saponaria ocymoides, Saxifraga mutata, S.

Potentilla fruticosa, Pratia repens, Pyrethrum uliginosum, Rudbeckia californica, R.

Potentilla fruticosa, Pratia repens, Primula vulgaris flore-pleno, Rudbeckia serotina, Salix reticulata, Saxifraga Fortunei, Sedum spectabile, Senecio pulcher, Statice latifolia, S.

Ononis rotundifolia, Onosma taurica, Orchis foliosa, Ourisia coccinea, Pentstemons, Physalis Alkekengi, Polygonum cuspidatum, Potentilla fructicosa, Pratia repens, Primula sikkimensis, Ramondia pyrenaica, Ranunculus aconitifolius flore-pleno, Rudbeckia californica, Saponaria ocymoides, Saxifraga longifolia, S.

Potentilla fruticosa, Pratia repens, Primula vulgaris flore-pleno, Rudbeckia serotina, Salix reticulata, Saxifraga Fortunei, Sedum spectabile, Senecio pulcher, Statice latifolia, S.

That was the rhododendron in the eighteenth century--and the camellia, the hydrangea, the wild cherry, the rudbeckia, the azalea, the aster, the ostrich fern, the catalpa, the spice bush, the Venus flytrap, the Virginia creeper, the euphorbia.