Mentzelia oligosperma

Nuttall ex Sims

Bot. Mag. 42: plate 1760. 1815.

Common names: Chickenthief
IllustratedEndemic
Synonyms: Mentzelia aurea Nuttall
Treatment appears in FNA Volume 12. Treatment on page 529. Mentioned on page 527, 530.

Plants perennial, with caudices. Stems erect, to 50 cm. Leaves: petiole to 3 mm (proximal leaves), absent (distal leaves); blade ovate to hastate, rarely elliptic, basally lobed or unlobed, to 10 × 5 cm, base usually cuneate to truncate, sometimes acute, margins usually serrate, sometimes crenate, rarely entire, apex acute. Pedicels (fruiting) 0–2.5 × 2 mm. Flowers: petals orange, (6–) 8–18.5 × (3–) 4–10.5 mm, apex cuspidate, hairy abaxially on distal 1/2; stamens 15–45, 5–9.5 mm, filaments monomorphic, filiform; styles 5–10 mm. Capsules subcylindric to clavate, (5–) 7–17 × 2–3.5 mm, base tapering gradually, capsule and pedicel not well-differentiated, walls thick, woody. Seeds (1–) 2–3 (–4) per capsule, oblong, without transverse folds. 2n = 20, 22.


Phenology: Flowering Mar–Oct.
Habitat: Limestone, gypsum, or sandstone rock outcrops or cliffs, clay or loam flats, grasslands, savannas.
Elevation: 0–1800 m.

Distribution

V12 589-distribution-map.jpg

Ariz., Ark., Colo., Ill., Kans., Mo., Nebr., N.Mex., Okla., S.Dak., Tex., Wyo.

Discussion

After Mentzelia aspera, M. oligosperma may be the most widespread member of sect. Mentzelia. Occurring widely across the Great Plains, it also extends eastward into Missouri and western Illinois and across southwestern New Mexico into southeastern Arizona.

Selected References

None.

Lower Taxa

None.
... more about "Mentzelia oligosperma"
monomorphic +
inner +  and outer +
filiform +
Larry Hufford +
Nuttall ex Sims +
tapering +, acute +, usually cuneate +  and truncate +
0 cm0 mm <br />0 m <br /> (10 cm100 mm <br />0.1 m <br />) +
ovate;hastate rarely elliptic basally lobed or unlobed +
0 cm0 mm <br />0 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
curved +  and straight +
0.7 cm7 mm <br />0.007 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
subcylindric +  and clavate +
not well-differentiated +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
Chickenthief +
Ariz. +, Ark. +, Colo. +, Ill. +, Kans. +, Mo. +, Nebr. +, N.Mex. +, Okla. +, S.Dak. +, Tex. +  and Wyo. +
0–1800 m. +
curved +  and straight +
s--shaped +, clavate +, urceolate +, ovoid +, cylindric +, subcylindric +, lingulate +  and cup-shaped +
Limestone, gypsum, or sandstone rock outcrops or cliffs, clay or loam flats, grasslands, savannas. +
free +  and adnate +
flattened +  and filiform +
cauline +  and basal +
entire +  and serrate +
apical +, subapical +  and inferior +
0 cm0 mm <br />0 m <br /> (?) +  and 0.25 cm2.5 mm <br />0.0025 m <br /> (?) +
not well-differentiated +
inconspicuous +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
connate +  and distinct +
8mm;18.5mm +
spreading +  and erect +
hairy +  and glabrous +
obovate +, oblanceolate +, elliptic +, ovate +  and spatulate +
0.4 cm4 mm <br />0.004 m <br /> (1.05 cm10.5 mm <br />0.0105 m <br />) +
0 cm0 mm <br />0 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering Mar–Oct. +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
persistent +
lanceolate +  and narrowly ovate +
Illustrated +  and Endemic +
adnate +, free +  and distinct +
included +  and exserted +
15 +  and 45 +
0.5 cm5 mm <br />0.005 m <br /> (0.95 cm9.5 mm <br />0.0095 m <br />) +
0 cm0 mm <br />0 m <br /> (50 cm500 mm <br />0.5 m <br />) +
papillate +
3-lobed +  and lingulate +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Mentzelia aurea +
Mentzelia oligosperma +
Mentzelia sect. Mentzelia +
species +
dendritic +  and unbranched +
sinuous +