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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 fulgida spreads by both stoloniferous stems and seed. The seeds are produced in fruits called cypselae, which are 2.2 to 4 millimetres (0.09 to 0.16 in) long and have short coroniform pappi 0.2 millimetres (0.008 in) long.
Black-eyed Susan – Rudbeckia hirta, Rudbeckia fulgida; Blackhaw – Viburnum prunifolium; Black-weed – Ambrosia artemisiifolia; Blueberry – Vaccinium (Cyanococcus) spp. Bluebell – Hyacinthoides non-scripta; Blue-of-the-heavens – Allium caeruleum; Bola verde – Anisocapparis speciosa; Bow-wood – Maclura pomifera; Box – Buxus
Rudbeckia hirta, native to eastern and central North America; Rudbeckia pinnata, native to the central and eastern United States and Ontario; Echinacea paradoxa
R. hirta may refer to: Rondeletia hirta , a plant species endemic to Jamaica Rudbeckia hirta , the black-eyed Susan, blackiehead, brown Betty, brown Daisy, brown-eyed Susan, a flowering plant species