Mentzelia aspera |
Mentzelia torreyi |
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dal-pega, rough stickleaf, tropical blazingstar, tropical stickleaf |
Torrey's blazing star |
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Habit | Plants annual, without caudices or tubers. | Plants with ground-level or subterranean caudices. | ||||
Stems | erect to decumbent, to 30 cm. |
5–25 cm. |
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Leaves | petiole 10–65 mm; blade hastate to ovate, usually basally lobed, sometimes unlobed, to 18 × 10 cm, base cuneate to truncate, margins serrate to crenate, apex acute. |
petiole absent; blade ovate or obovate, to 45 × 35 mm, intersinus distance 2–4 mm. |
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Pedicels | (fruiting) 1–3 × 2 mm (often appearing absent because thick and continuous with capsule). |
0(–1.5) mm. |
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Flowers | petals orange or yellow, 5–15 × 3–7 mm, apex cuspidate, hairy abaxially at apex; stamens 20–30, 5 mm, filaments heteromorphic, 5 outermost narrowly spatulate, inner filiform; style 5 mm. |
petals yellow to orange, narrowly spatulate to obovate, 4.5–17 × 1.2–5 mm, apex rounded; stamens 25–45, 7–21 mm; styles 7–18 mm. |
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Capsules | subcylindric to clavate, 9–30 × 3–3.5 mm, base tapering gradually, capsule and pedicel not well-differentiated. |
3–7 × 3–4.5 mm. |
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Seeds | 5–9 per capsule, pyriform to oblong, without transverse folds. |
3–9 per capsule, edges prominently to inconspicuously ridged. |
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2n | = 20. |
= 28. |
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Mentzelia aspera |
Mentzelia torreyi |
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Phenology | Flowering Aug–Oct. | |||||
Habitat | Arroyo and canyon bottoms, grasslands, desert scrub, riparian cottonwood and willow vegetation. | |||||
Elevation | 100–2000 m. (300–6600 ft.) | |||||
Distribution |
AZ; Mexico; Central America; South America; West Indies [Introduced in Atlantic Islands (Cape Verde Islands)]
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CA; ID; NV
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Discussion | Mentzelia aspera is uncommon in southern Arizona. It is the most widespread species of the genus and is regarded as weedy by some authors (H. J. Thompson and A. M. Powell 1981). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in flora). In the phylogenetic study by L. Hufford et al. (2003), Mentzelia torreyi was recovered as the sister to the rest of the genus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 12, p. 528. | FNA vol. 12, p. 530. | ||||
Parent taxa | Loasaceae > Mentzelia > sect. Mentzelia | Loasaceae > Mentzelia > sect. Micromentzelia | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Name authority | Linnaeus: Sp. Pl. 1: 516. (1753) | A. Gray: Proc. Amer. Acad. Arts 10: 72. (1874) | ||||
Web links |