Coreopsidinae

• Overview
• Taxonomy
• Genera
• Bibliography
• Footnotes
• Sources

Overview

Taxonomy

The Subtribe Coreopsidinae is further organized into finer groupings including:

• Genus (6): Bidens · Chrysanthellum · Coreopsis · Cosmos · Dahlia · Fitchia
• Species: ZipcodeZoo has pages for 6,241 species, subspecies, varieties, forms, and cultivars in the Subtribe Coreopsidinae.

Genera

Bidens

Bidens is a genus of flowering plants in the family Asteraceae. It contains about 200 species. The common names beggarticks, black jack, burr marigolds, cobbler's pegs, Spanish needles, stickseeds, tickseeds and tickseed sunflowers refer to the achene burrs on the seeds of this genus, most of which are barbed. The generic name refers to the same fact; it means "two-tooth", from Latin bis "two" + dens "tooth". [more]

Chrysanthellum

[more]

Coreopsis

Tickseed is the common name for the plant Coreopsis, a group of 35 species of flowering plants in the Family Asteraceae and Genus Coreopsis. Twenty-eight species are native to the North America and the others come from Central and South America. The flowers are usually yellow with a toothed tip. The name is derived from the Greek word koris, meaning Bedbug. The plants are also popularly called "Calliopsis." [more]

Cosmos

Annuals [perennials or subshrubs], 30-250 cm. Stems usually 1, erect or ascending, branched distally or ± throughout. Leaves mostly cauline; opposite; petiolate or sessile; blades usually 1-3-pinnately lobed [undivided], ultimate margins usually entire, faces usually glabrous, sometimes glabrate, hispid, puberulent, or scabridulous. Heads radiate, borne singly or in corymbiform arrays. Calyculi of [5-]8 basally connate, ± linear to subulate, herbaceous (striate) bractlets. Involucres hemispheric or subhemispheric [cylindric], 3-15 mm diam. Phylla­ries persistent, [5-]8 in ± 2 series, distinct, lanceolate, lance-oblong, lance-ovate, or oblong, ± equal, membranous or herbaceous, margins ± scarious. Receptacles flat, paleate; paleae falling, linear, flat or slightly concave-convex, scarious (entire). Ray florets [0, 5] 8 (more in "double" cultivars), neuter; corollas white to pink or purple, or yellow to red-orange. Disc florets 10-20[-80+], bisexual, fertile; corollas yellow [orange] (at least distally), tubes shorter than funnelform throats, lobes 5, ± deltate (staminal filaments hairy near anthers; style branches linear, flattened, thicker distally, hirtellous, appendages relatively slender). Cypselae (dark brown or black) relatively slender, quadrangular-cylindric or -fusiform [outer somewhat obcompressed], sometimes slightly arcuate, attenuate-beaked, not winged [winged], faces glabrous or hispid to scabridulous or ± setose, sometimes papillate, usually with 1 groove; pappi persistent [falling], of 2-4[-8] retrorsely [antrorsely] barbed awns, sometimes 0. x = 12.^[1] [more]

Dahlia

Dahlia is a genus of bushy, tuberous, herbaceous perennial plants native to Mexico, Central America, and Colombia. A member of the Asteraceae or Compositae, dicotyledonous plants, related species include the sunflower, daisy, chrysanthemum and zinnia. There are at least 36 species of dahlia, with hybrids commonly grown as garden plants. Flower forms are variable, with one head per stem; these can be as small as 2 in (5.1 cm) in diameter or up to 1 ft (30 cm) ("dinner plate"). This great variety results from dahlias being octoploids?that is, they have eight sets of homologous chromosomes, whereas most plants have only two. In addition, dahlias also contain many transposons - genetic pieces that move from place to place upon an allele - which contributes to their manifesting such great diversity. [more]

Fitchia

Fitchia is a genus of in the Asteraceae family. It contains the following species: [more]

At least 10 species and subspecies belong to the Genus Fitchia.

More info about the Genus Fitchia may be found here.

Bibliography

• Pandey, A. K., S. Chopra, and R. P. Singh. 1986. Development and structure of seeds and fruits in Compositae: Cosmos species. J. Indian Bot. Soc. 65: 362-368.
• Sherff, E. E. 1955. Cosmos. In: N. L. Britton et al., eds. 1905+. North American Flora. 47+ vols. New York. Ser. 2, part. 2, pp. 130-146.

Footnotes

1. Robert W. Kiger "Cosmos". in Flora of North America Vol. 21 Page 184, 203. Oxford University Press. Online at EFloras.org.

Sources

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