Mentzelia decapetala

(Pursh) Urban

Ber. Deutsch. Bot. Ges. 10: 263. 1892.

Common names: Gumbo-lily 10-petalled western star
WeedyEndemic
Basionym: Bartonia decapetala Pursh Bot. Mag. 36: plate 1487. 1812
Treatment appears in FNA Volume 12. Treatment on page 504. Mentioned on page 497, 499.

Plants biennial or perennial, bushlike, perennials with ground-level caudices. Stems solitary, erect, straight; branches distal or along entire stem, proximal or 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. Bracts: margins pinnate. 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. Capsules cylindric, 30–43 × 12–17 mm, base tapering, not longitudinally ridged. Seeds 2.3–4 mm; coat anticlinal cell walls straight, papillae 4–10 per cell. 2n = 22.


Phenology: Flowering Jun–Aug(–Oct).
Habitat: Rock outcrops, slopes, dry short-grass prairies, riverbanks, roadsides, loam, limestone, sandy, silty, clayey, and gravelly soils.
Elevation: 300–2400 m.

Distribution

V12 1075-distribution-map.jpg

Alta., Man., Sask., Colo., Ill., Iowa, Kans., Minn., Mont., Nebr., N.Mex., Okla., S.Dak., Tex., Utah, Wyo.

Discussion

Mentzelia decapetala is introduced in Grundy County, Illinois. It appears to be native throughout the rest of its distribution.

Selected References

None.

Lower Taxa

None.
... more about "Mentzelia decapetala"
John J. Schenk +  and Larry Hufford +
(Pursh) Urban +
Bartonia decapetala +
Gumbo-lily +  and 10-petalled western star +
Alta. +, Man. +, Sask. +, Colo. +, Ill. +, Iowa +, Kans. +, Minn. +, Mont. +, Nebr. +, N.Mex. +, Okla. +, S.Dak. +, Tex. +, Utah +  and Wyo. +
300–2400 m. +
Rock outcrops, slopes, dry short-grass prairies, riverbanks, roadsides, loam, limestone, sandy, silty, clayey, and gravelly soils. +
Flowering Jun–Aug(–Oct). +
Ber. Deutsch. Bot. Ges. +
Weedy +  and Endemic +
Mentzelia decapetala +
Mentzelia sect. Bartonia +
species +