Tetragonotheca helianthoides |
Tetragonotheca |
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pineland nerveray |
nerveray |
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Habit | Perennials, mostly 30–120 cm. | |||||||||||||
Stems | patently to retrorsely ± villous. |
erect. |
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Leaves | cauline, not connate-perfoliate; blades ovate to rhombic or lanceolate, 7–20 × 3–13 cm, coarsely toothed. |
basal and/or cauline; mostly opposite; petiolate, subpetiolate, or sessile (bases sometimes connate-perfoliate); blades lanceolate, ovate, rhombic, or rounded-deltate, sometimes pinnatifid, ultimate margins usually toothed, faces glabrate, sparsely hispidulous, or puberulent, gland-dotted. |
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Involucres | obpyramidal to hemispheric, 12–25+ mm diam. |
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Receptacles | conic, paleate (paleae persistent, lanceolate to lance-ovate, flat or weakly conduplicate, apices acute). |
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Ray florets | 6–14; laminae 15–40+ mm. |
6–21+, pistillate, fertile; corollas yellow (often with reddish nerves). |
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Disc florets | 25–150+, bisexual, fertile; corollas yellow, tubes (basally dilated) much shorter than ampliate, cylindric throats, lobes 5, deltate. |
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Phyllaries | persistent, 10–25+ in ± 2 series (outer 4 broadly lanceolate, foliaceous, the inner ovate to lanceolate, smaller, more scarious, each subtending a ray floret). |
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Heads | radiate, borne singly or in loose, corymbiform arrays. |
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Cypselae | ± ovoid, 4–6 mm; pappi 0. |
± ovoid or plumply 4- or 5-angled, finely 32–40-ribbed, sparsely strigose or glabrous; pappi 0, or of 1–10+ subulate to acerose scales (to 0.5 mm), or of 16–30, ± spatulate scales (0.5–2 mm). |
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x | = 17. |
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2n | = 34. |
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Tetragonotheca helianthoides |
Tetragonotheca |
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Phenology | Flowering mid spring–early summer. | |||||||||||||
Habitat | Sandy soils, often in thickets | |||||||||||||
Elevation | 0–400 m (0–1300 ft) | |||||||||||||
Distribution |
AL; FL; GA; MS; NC; SC; TN; VA
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n Mexico; s United States |
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Discussion | Species 4 (4 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 21, p. 179. | FNA vol. 21, p. 178. | ||||||||||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Galinsoginae > Tetragonotheca | Asteraceae > tribe Heliantheae > subtribe Galinsoginae | ||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Name authority | Linnaeus: Sp. Pl. 2: 903. (1753) | Linnaeus: Sp. Pl. 2: 903. (1753): Gen. Pl. ed. 5, 384. (1754) | ||||||||||||
Web links |