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"
petaloid +  and heteromorphic +
4.8 cm48 mm <br />0.048 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
clawed +  and spatulate +
1.2 cm12 mm <br />0.012 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
Acute (?) +  and Attenuate (?) +
John J. Schenk +  and Larry Hufford +
(Pursh) Urban +
not +  and clasping +
ridged +  and tapering +
Bartonia decapetala +
7.2 cm72 mm <br />0.072 m <br /> (29.5 cm295 mm <br />0.295 m <br />) +
unlobed;lobed;orbiculate;obovate;unlobed;lobed;orbiculate;obovate;unlobed;lobed;orbiculate;obovate;oblanceolate;spatulate;linear;lanceolate;elliptic;ovate;cordate;deltate;hastate +
1.01 cm10.1 mm <br />0.0101 m <br /> (2.33 cm23.3 mm <br />0.0233 m <br />) +
widest;14mm;45mm +
upcurved +  and antrorse +
distal +  and along entire stem +
3 cm30 mm <br />0.03 m <br /> (4.3 cm43 mm <br />0.043 m <br />) +
cylindric +
1.2 cm12 mm <br />0.012 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
Gumbo-lily +  and 10-petalled western star +
elliptic;lanceolate +
Alta. +, Man. +, Sask. +, Colo. +, Ill. +, Iowa +, Kans. +, Minn. +, Mont. +, Nebr. +, N.Mex. +, Okla. +, S.Dak. +, Tex. +, Utah +  and Wyo. +
300–2400 m. +
curved +  and straight +
s--shaped +, clavate +, urceolate +, ovoid +, cylindric +, subcylindric +, lingulate +  and cup-shaped +
Rock outcrops, slopes, dry short-grass prairies, riverbanks, roadsides, loam, limestone, sandy, silty, clayey, and gravelly soils. +
free +  and adnate +
unlobed +  and filiform +
cauline +  and basal +
pinnate +  and serrate +
apical +, subapical +  and inferior +
perpendicular +  and oriented +
not elongating +
inconspicuous +
connate +  and distinct +
4.7 cm47 mm <br />0.047 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
spreading +  and erect +
hairy +  and glabrous +
Obovate (?) +, Oblanceolate (?) +, Elliptic (?) +, Ovate (?) +  and Spatulate (?) +
1.3 cm13 mm <br />0.013 m <br /> (2.27 cm22.7 mm <br />0.0227 m <br />) +
Flowering Jun–Aug(–Oct). +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Ber. Deutsch. Bot. Ges. +
flattened +  and ovoid +
persistent +
lanceolate +  and narrowly ovate +
Weedy +  and Endemic +
white +  and yellow +
adnate +, free +  and distinct +
included +  and exserted +
straight +
papillate +
3-lobed +  and lingulate +
3.6 cm36 mm <br />0.036 m <br /> (5.3 cm53 mm <br />0.053 m <br />) +
Mentzelia decapetala +
Mentzelia sect. Bartonia +
species +
0.53 cm5.3 mm <br />0.0053 m <br /> (1.37 cm13.7 mm <br />0.0137 m <br />) +
dendritic +  and unbranched +
sinuous +  and straight +
perennial +  and biennial +
plant +  and bushlike +