Mentzelia decapetala |
Mentzelia reverchonii |
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10-petal western star, evening starflower, gumbo-lily, tenpetal blazingstar |
Reverchon's blazingstar |
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Habit | Plants biennial or perennial, bushlike, perennials with ground-level caudices. | Plants biennial or perennial, candelabra-form, perennials with ground-level caudices. |
Stems | solitary, erect, straight; branches distal or along entire stem, proximal or distal longest, antrorse, straight to upcurved; hairy. |
solitary, erect, straight; branches distal, distal longest, antrorse, straight to upcurved; hairy. |
Leaves | blade 72–295 × 14–45 mm, widest intersinus distance 10.1–23.3 mm; proximal oblanceolate or elliptic, margins serrate to pinnate, teeth or lobes 16–26, slightly antrorse, 1–16.5 mm; distal elliptic to lanceolate, base clasping or not, margins serrate to pinnate, teeth or lobes 9–20, slightly antrorse, 5.3–13.7 mm; surfaces with needlelike trichomes. |
blade 24.2–54 × 6.6–29 mm, widest intersinus distance 5.4–13.5(–22.4) mm; proximal oblanceolate to elliptic, margins dentate to pinnate, teeth or lobes 10–20, perpendicular to leaf axis, 1.1–5 mm; distal lanceolate, base not clasping, margins dentate, teeth 8–14, perpendicular to leaf axis, 0.6–3.8 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and occasionally needlelike trichomes, adaxial surface with simple grappling-hook and needlelike trichomes. |
Bracts | margins pinnate. |
margins usually toothed, occasionally entire. |
Flowers | petals white, 47–75 × 13–22.7 mm, apex acute to attenuate, glabrous abaxially; stamens white to yellow, 5 outermost petaloid, filaments spatulate, strongly clawed, 48–75 × 12–23 mm, without anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles 36–53 mm. |
petals golden yellow, (9.6–)11.1–14.1(–22) × 2.5–4.2(–5.5) mm, apex acute to rounded, glabrous abaxially; stamens golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 9.4–13.4(–20) × 2.2–3.7(–5) mm, without anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles 8.7–11.4(–13) mm. |
Capsules | cylindric, 30–43 × 12–17 mm, base tapering, not longitudinally ridged. |
usually cylindric, rarely cup-shaped, 9.4–22 × 6–9.1 mm, length usually more than, occasionally a few slightly less than, 2 times diam., base tapering, not longitudinally ridged. |
Seeds | 2.3–4 mm; coat anticlinal cell walls straight, papillae 4–10 per cell. |
coat anticlinal cell walls straight, papillae 5–7 per cell. |
2n | = 22. |
= 18. |
Mentzelia decapetala |
Mentzelia reverchonii |
|
Phenology | Flowering Jun–Aug(–Oct). | Flowering Apr–Oct. |
Habitat | Rock outcrops, slopes, dry short-grass prairies, riverbanks, roadsides, loam, limestone, sandy, silty, clayey, and gravelly soils. | Grasslands on eroded riverbanks, roadsides, roadcuts, sparsely vegetated hillside slopes, sandy, gravelly, clayey, occasionally gypsum soils. |
Elevation | 300–2400 m. (1000–7900 ft.) | 50–600 m. (200–2000 ft.) |
Distribution |
CO; IA; IL; KS; MN; MT; NE; NM; OK; SD; TX; UT; WY; AB; MB; SK
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CO; NM; OK; TX; Mexico (Coahuila, Nuevo León) |
Discussion | Mentzelia decapetala is introduced in Grundy County, Illinois. It appears to be native throughout the rest of its distribution. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 12, p. 504. | FNA vol. 12, p. 519. |
Parent taxa | Loasaceae > Mentzelia > sect. Bartonia | Loasaceae > Mentzelia > sect. Bartonia |
Sibling taxa | ||
Synonyms | Bartonia decapetala | M. pumila var. reverchonii, M. hintoniorum, Nuttallia reverchonii |
Name authority | (Pursh) Urban: Ber. Deutsch. Bot. Ges. 10: 263. (1892) | (Urban & Gilg) H. J. Thompson & Zavortink: Wrightia 4: 24. (1968) |
Web links |