Tagetes micrantha |
Tagetes |
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licorice marigold |
marigold |
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Habit | Annuals, 3–15(–35+) cm. | Annuals, perennials, subshrubs, or shrubs [perennials], mostly 10–80(–200) cm. | ||||||||||||
Stems | erect, branched distally or ± throughout. |
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Leaves | blades 10–25(–35+) overall, lobes or leaflets 0 or 3–5, linear to filiform, 10–25(–35+) × 0.5–1.5+ mm. |
cauline; mostly opposite (distal sometimes alternate); petiolate or sessile; blades mostly lanceolate to oblanceolate overall, usually 1–3-pinnately lobed or -pinnatisect, ultimate margins toothed or entire, faces glabrous or hairy (oil-glands scattered and/or submarginal). |
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Peduncles | 10–50+ mm. |
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Involucres | 9–12+ × 1–2 mm. |
narrowly cylindric or fusiform to turbinate or broadly campanulate, 1–12+ mm diam. |
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Receptacles | convex to conic, smooth or finely pitted, epaleate. |
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Ray florets | 0–1+; laminae ochroleucous to yellowish, ± oblong, 1.5–2.5 mm. |
0 or 1–8(–13+) (to 100+ in “double” cultivars), pistillate, fertile (except “double” cultivars); corollas yellow or orange, red-brown (with or without yellow/orange), or white. |
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Disc florets | 5–6+; corollas 2.5–3.5 mm. |
6–120+, bisexual, fertile; corollas greenish yellow to orange, sometimes tipped with red or red-brown, tubes much longer than or about equaling funnelform throats, lobes 5, deltate to lance-linear (equal or 2 sinuses deeper than others). |
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Phyllaries | persistent, 3–21+ in 1–2 series (connate to 7/8+ their lengths, usually streaked and/or dotted with oil-glands). |
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Calyculi | 0. |
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Heads | borne ± singly. |
radiate or discoid, borne singly or in ± corymbiform arrays. |
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Cypselae | 7 mm; pappi of 2 ± subulate-aristate scales 4–5+ mm plus 2 distinct, oblong to ovate, ± erose scales 1.5–2.5 mm. |
narrowly obpyramidal or fusiform-terete, sometimes weakly flattened, glabrous or hairy; pappi persistent, of 2–5(–10) dissimilar, distinct or connate scales in ± 1 series: 0–5+ oblong to lanceolate, erose-truncate or laciniate plus 0–2(–5) longer, subulate to aristate. |
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x | = 12. |
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2n | = 24. |
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Tagetes micrantha |
Tagetes |
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Phenology | Flowering Aug–Sep. | |||||||||||||
Habitat | Disturbed sites, moist soils in meadows, juniper woodlands, pine forests | |||||||||||||
Elevation | 1500–2600 m (4900–8500 ft) | |||||||||||||
Distribution |
AZ; NM; TX; Mexico
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Tropical and warm-temperate America; especially Mexico [Introduced in Old World] |
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Discussion | Species 40+ (4 in the flora). Some Tagetes species (e.g., T. erecta) produce nematicidal thiophenes in their roots and have been shown to be effective controls for nematodes in diverse crops (cf., http://www.ncagr.com/agronomi/nnote1.htm). Reports of “Tagetes minima L.” for Pennsylvania (cf. http://plants.usda.gov) are evidently rooted in an error for T. minuta. Report of T. pusilla Kunth (= T. filifolia Lagasca) for Maryland (http://plants.usda.gov) was not verified for this treatment. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 21, p. 236. | FNA vol. 21, p. 235. | ||||||||||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Pectidinae > Tagetes | Asteraceae > tribe Heliantheae > subtribe Pectidinae | ||||||||||||
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Subordinate taxa | ||||||||||||||
Name authority | Cavanilles: Icon. 4: 31, plate 352. (1797) | Linnaeus: Sp. Pl. 2: 887. (1753): Gen. Pl. ed. 5, 378. (1754) | ||||||||||||
Web links |