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Coreopsis latifolia, a rhizomatous perennial herb, grows up to 1.5 metres (4.9 ft) tall. The leaves are oval and may exceed 20 centimetres (7.9 in) long by 10 centimetres (3.9 in) wide. [5] The inflorescence is a corymb [3] of flower heads, each with five phyllaries which may be over a centimeter long.
Coreopsis is best described as paraphyletic. Previously (1936), Coreopsis was classified into 11 sections and 114 species, but the African species were subsequently reclassified as Bidens , leaving the North and South American species, some 75–80 in all, under Coreopsis . 45 species are in the 11 North American sections, and the remaining 35 ...
Coreopsis auriculata is a perennial growing from 10 to 30 cm (4-12 in) tall and sometimes to 60 cm (24 in). Plants with rounded yellow flower heads bloom in spring and early summer. They are often stoloniferous , forming long spreading colonies by way of short stolons produced after flowering.
Coreopsis tinctoria, commonly known as plains coreopsis, garden tickseed, golden tickseed, or calliopsis, is an annual forb. The species is common in Canada (from Quebec to British Columbia ), northeast Mexico ( Coahuila , Nuevo León , Tamaulipas ), and most of the United States , especially the Great Plains and Southern States .
Coreopsis californica is an annual herb up to 30 cm (12 inches) tall. It has linear leaves that are generally basal and 2–10 centimetres (0.79–3.94 in) long. [ 2 ] The yellow flower heads have both ray florets and disc florets and appear from March to May.
Coreopsis grandiflora is a North American species of perennial plant in the family Asteraceae. The common name is large-flowered tickseed . [ 4 ] It is found in eastern Canada ( Quebec , Ontario , New Brunswick ) and much of the United States , especially the south-central part of the country ( Oklahoma , Arkansas , etc.). [ 5 ]
Coreopsis palustris, the swamp tickseed, is a species of flowering plant in the family Asteraceae. [1] A perennial reaching 1.2 m (4 ft), it is found in wet areas from southeastern North Carolina to northern Florida. [2] [1] There is a cultivar, 'Summer Sunshine', that is noted for blooming early in the fall. [3]
Coreopsis bigelovii is a species of flowering plant in the daisy or sunflower family, Asteraceae, with the common names Bigelow coreopsis and Bigelow's tickseed. [3] It is endemic to California. [4] The plant is known from the southern California Coast Ranges, southwestern Sierra Nevada, Transverse Ranges, and the Mojave and Colorado deserts.