Mentzelia decapetala |
Mentzelia strictissima |
|
---|---|---|
10-petal western star, evening starflower, gumbo-lily, tenpetal blazingstar |
grassland blazingstar |
|
Habit | Plants biennial or perennial, bushlike, perennials with ground-level caudices. | Plants biennial, candelabra-form. |
Stems | solitary, erect, straight; branches distal or along entire stem, proximal or distal longest, antrorse, straight to upcurved; hairy. |
solitary (or multiple as wound response), erect, straight; branches distal, distal longest, antrorse, straight; 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 28–70 × 5.8–17.2 mm, widest intersinus distance 3.4–11.4 mm; proximal oblanceolate, lanceolate, or elliptic, margins dentate to pinnate, teeth or lobes 10–20, perpendicular to leaf axis, 0.9–3.1 mm; distal lanceolate, base usually not clasping, rarely clasping, margins usually dentate, occasionally serrate, teeth 8–18, usually perpendicular to leaf axis, occasionally slightly antrorse, 0.6–5.4 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and needlelike trichomes, adaxial surface with simple grappling-hook and needlelike trichomes. |
Bracts | margins pinnate. |
margins entire or toothed. |
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 white, 14.7–22(–24.4) × 1.9–4.4 mm, apex acute, glabrous abaxially; stamens white, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 13.3–23.1 × 1.3–3.1(–4.4) mm, without anthers, second whorl without anthers; anthers straight after dehiscence, epidermis smooth; styles 7.6–12.9 mm. |
Capsules | cylindric, 30–43 × 12–17 mm, base tapering, not longitudinally ridged. |
cup-shaped to cylindric, 10.2–20.1 × 6.7–9.6 mm, base rounded to occasionally tapering, not longitudinally ridged. |
Seeds | 2.3–4 mm; coat anticlinal cell walls straight, papillae 4–10 per cell. |
coat anticlinal cell walls wavy, papillae 3–8 per cell. |
2n | = 22. |
= 20. |
Mentzelia decapetala |
Mentzelia strictissima |
|
Phenology | Flowering Jun–Aug(–Oct). | Flowering May–Oct. |
Habitat | Rock outcrops, slopes, dry short-grass prairies, riverbanks, roadsides, loam, limestone, sandy, silty, clayey, and gravelly soils. | Arid grasslands. |
Elevation | 300–2400 m. (1000–7900 ft.) | 800–1800 m. (2600–5900 ft.) |
Distribution |
CO; IA; IL; KS; MN; MT; NE; NM; OK; SD; TX; UT; WY; AB; MB; SK
|
NM; TX |
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.) |
See discussion under 5. Mentzelia nuda. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 504. | FNA vol. 12, p. 505. |
Parent taxa | Loasaceae > Mentzelia > sect. Bartonia | Loasaceae > Mentzelia > sect. Bartonia |
Sibling taxa | ||
Synonyms | Bartonia decapetala | Nuttallia strictissima |
Name authority | (Pursh) Urban: Ber. Deutsch. Bot. Ges. 10: 263. (1892) | (Wooton & Standley) J. Darlington: Ann. Missouri Bot. Gard. 21: 163. (1934) |
Web links |