Mentzelia longiloba |
Mentzelia filifolia |
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Adonis blazingstar, Adonis stickleaf, many flower mentzelia |
narrow-leaf blazingstar |
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Habit | Plants biennial or perennial, bushlike or candelabra-form, perennials with ground-level caudices. | Plants biennial, candelabra-form. | ||||||||
Stems | solitary, erect, straight; branches distal or along entire stem, distal or proximal longest, antrorse, upcurved; hairy. |
solitary, erect, straight; branches distal, distal longest, antrorse, straight; hairy. |
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Leaves | blade 35–112 × 4.3–27.1 mm, widest intersinus distance 2.3–15.3 mm, always on some leaves 4+ mm; proximal oblanceolate to elliptic, margins dentate to pinnate, teeth or lobes 12–30(–50), perpendicular to leaf axis or antrorse, 1–9 mm; distal lanceolate, base not clasping, margins serrate to pinnate, teeth or lobes 8–28, perpendicular to slightly antrorse, 0.8–7.5 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and generally needlelike trichomes, adaxial surface with simple grappling-hook and needlelike trichomes. |
blade 43–94(–115) × (4.3–)7.5–36 mm, widest intersinus distance 1–2.4 mm; proximal oblanceolate to elliptic, margins pinnatisect, lobes 8–20, perpendicular to leaf axis, 3.2–12(–15.7) mm; distal oblanceolate to elliptic, base not clasping, margins pinnatisect, lobes 8–20, perpendicular to leaf axis, 5.6–17.1 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and occasionally needlelike trichomes, adaxial surface with needlelike trichomes. |
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Bracts | margins entire or toothed to pinnate. |
margins entire or pinnate. |
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Flowers | petals golden yellow, 11.3–20.4 × 2.9–7.2[–8.9] mm, apex acute to rounded, glabrous abaxially; stamens golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 10.4–17.8 × 1.9–5.2[–5.6] mm, with or without anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles (5.4–)8.5–10.9(–13) mm. |
petals golden yellow, 13–18.5 × 3.7–6.1 mm, apex acute, glabrous abaxially; stamens golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 10.2–14.7(–18) × (1.3–)2.5–4.4 mm, without anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles 10–12.5(–14) mm. |
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Capsules | cup-shaped to cylindric, [7.6–]9.1–16.4 × 5.7–9.2 mm, length usually to 2 times diam., sometimes a few more, base tapering to rounded, not longitudinally ridged. |
cylindric, 11–19 × 5–7.5 mm, base tapering, not or diminutively longitudinally ridged. |
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Seeds | coat anticlinal cell walls straight or sinuous, papillae 4–106 per cell. |
coat anticlinal cell walls sinuous, papillae 42–48 per cell. |
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2n | = 20. |
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Mentzelia longiloba |
Mentzelia filifolia |
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Phenology | Flowering Jul–Aug. | |||||||||
Habitat | Roadcuts, slopes, dark loam, rocky soils. | |||||||||
Elevation | 2100–2200 m. (6900–7200 ft.) | |||||||||
Distribution |
AZ; CA; CO; NM; TX; UT; n Mexico
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AZ; NM |
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Discussion | Varieties 4 (3 in the flora). Variety pinacatensis J. J. Schenk & L. Hufford is known from the Mexican state of Sonora. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Mentzelia filifolia is known from the Chuska Mountains of Apache County, Arizona, and McKinley and San Juan counties, New Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 12, p. 520. | FNA vol. 12, p. 517. | ||||||||
Parent taxa | Loasaceae > Mentzelia > sect. Bartonia | Loasaceae > Mentzelia > sect. Bartonia | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | M. multiflora subsp. longiloba | |||||||||
Name authority | J. Darlington: Ann. Missouri Bot. Gard. 21: 176. (1934) | J. J. Schenk & L. Hufford: Madroño 57: 251, figs. 1D, 2B. (2010) | ||||||||
Web links |