Glebionis segetum |
Glebionis |
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corn chrysanthemum, corn daisy, corn marigold |
glebionis |
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Habit | Annuals, 10–30(–80+) cm. | |||||
Stems | usually 1, erect to ascending, usually branched distally, glabrous. |
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Leaves | blades oblong to obovate or spatulate, 25–65+ × 8–25+ mm, coarsely 1-pinnate or not lobed, ultimate margins dentate or entire. |
mostly cauline; alternate; petiolate or sessile; blades obovate to oblong (bases sometimes ± clasping), usually 1–3-pinnately lobed, ultimate margins usually dentate, rarely entire, faces glabrous. |
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Involucres | ± hemispheric or broader, 15–25+ mm diam. |
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Receptacles | convex to hemispheric, epaleate. |
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Ray florets/ |
golden yellow, laminae oblong-ovate, 8–20 mm. |
10–21+, pistillate, fertile; corollas mostly yellow, sometimes paler distally, laminae linear, oblong, or ovate. |
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Disc florets | 60–150+, bisexual, fertile; corollas ± yellow, tubes ± cylindric (basally ± dilated, ± gland-dotted), throats funnelform, lobes 5, narrowly deltate (each with a resin sac). |
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Phyllaries | persistent, 25–60+ in 3–4 series, distinct, ovate or obovate to lance-deltate or lanceolate (not carinate, usually each with a resin canal), margins and apices (colorless or stramineous to pale brown) scarious (tips of inner often ± dilated). |
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Heads | radiate, borne singly or in 2s or 3s. |
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Cypselae | dimorphic: outer (ray) 3-angled (each angle ± winged, wings not spine-tipped); inner (disc) compressed-prismatic to columnar (adaxial, rarely abaxial, angles sometimes ± winged, wings not spine-tipped); ribs usually 10, faces glabrous, sometimes gland-dotted between ribs (pericarps without myxogenic cells or resin sacs; embryo sac development monosporic); pappi 0. |
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Ray cypselae | weakly triquetrous, 2.5–3 mm, obscurely, if at all, winged, lateral faces 2-ribbed, abaxial faces 3-ribbed; disc cypselae ± compressed-columnar, 2–3 mm, 10-ribbed, not winged. |
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x | = 9. |
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2n | = 18. |
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Glebionis segetum |
Glebionis |
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Phenology | Flowering Apr–Aug(–Oct). | |||||
Habitat | Disturbed sites | |||||
Elevation | 0–100 m (0–300 ft) | |||||
Distribution |
AK; AL; CA; CT; LA; MA; ME; NC; NY; OH; OR; PA; SC; Eurasia; n Africa [Introduced in North America]
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Eurasia (especially Mediterranean and Macaronesia) and northern Africa (widely cultivated and adventive) [Introduced in North America] |
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Discussion | Species 2 (2 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. 19, p. 555. | FNA vol. 19, p. 554. | ||||
Parent taxa | Asteraceae > tribe Anthemideae > Glebionis | Asteraceae > tribe Anthemideae | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Chrysanthemum segetum, Xantophtalmum segetum | Xantophtalmum | ||||
Name authority | (Linnaeus) Fourreau: Ann. Soc. Linn. Lyon, n. s. 17: 90. (1869) | Cassini: in F. Cuvier, Dict. Sci. Nat. ed. 2, 41: 41. (1826) | ||||
Web links |