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Rudbeckia (/ r ʌ d ˈ b ɛ k i ə /) [4] is a plant genus in the Asteraceae or composite family. [ 5 ] [ 6 ] Rudbeckia flowers feature a prominent, raised central disc in black, brown shades of green, and in-between tones, giving rise to their familiar common names of coneflowers and black-eyed-susans .
Rudbeckia hirta is an upright annual (sometimes biennial or perennial) growing 30–100 cm (12–39 in) tall by 30–45 cm (12–18 in) wide.It has alternate, mostly basal leaves 10–18 cm long, covered by coarse hair, with stout branching stems and daisy-like, composite flower heads appearing in late summer and early autumn.
Rudbeckia laciniata has long been cultivated as an ornamental plant and came to Paris in the private garden of Vespasias Robin at the beginning of the 17th century. Caspar Bauhin also received this ornamental plant from Robin in 1622, who described it as 'Doronicum americanum laciniato folio'. The first garden in Germany in which it is recorded ...
Rudbeckia grandiflora var. alismifolia - Stems glabrous or sparsely pubescent, with hairs ascending a less than 0.5 mm; Rudbeckia grandiflora var. grandiflora - Stems with regular spreading hairs over 1 mm
It is an annual plant growing to 1 m tall, with simple or branched stems. The leaves are oval, 5–10 cm (2.0–3.9 in) long and 2–4 cm (0.79–1.57 in) broad. The flowers are produced in daisy -like inflorescences , with yellow to yellowish-purple florets.
Rudbeckia triloba is a biennial or short-lived perennial herbaceous plant that grows to a height of 5 ft (150 cm) with a spread of up to 2.5 ft (75 cm). The primary stem has numerous branches, giving the plant an open, bushy appearance. The stems and branches are hairy and medium green, sometimes with a reddish color. The leaves are also hairy.
The inflorescence is a usually solitary sunflower-like flower head with a base up to 6 centimeters wide lined with several ray florets, each of which are 2 to 6 centimeters long. The yellow ray florets extend outwards and then become reflexed, pointing back along the stem.
Rudbeckia texana is a robust perennial growing up to 150 cm (59 in) tall by 30 cm (12 in) wide. It has alternate, mostly basal leaves 9–20 cm long. The leaves have a leathery texture and are elliptic in shape. Flowering stems appear in the spring, each stem terminating with between 1 and 4 composite flower heads.