Mentzelia longiloba

J. Darlington

Ann. Missouri Bot. Gard. 21: 176. 1934.

Illustrated
Synonyms: Mentzelia multiflora subsp. longiloba (J. Darlington) Felger
Treatment appears in FNA Volume 12. Treatment on page 520. Mentioned on page 501, 502, 524.

Plants biennial or perennial, bushlike or candelabra-form, perennials with ground-level caudices. Stems solitary, erect, straight; branches distal or along entire stem, distal or proximal longest, antrorse, upcurved; hairy. Leaves: blade 35–112 × 4.3–27.1 mm, widest intersinus distance 2.3–15.3 mm, always on some leaves 4+ mm; proximal oblanceolate to elliptic, margins dentate to pinnate, teeth or lobes 12–30 (–50), perpendicular to leaf axis or antrorse, 1–9 mm; distal lanceolate, base not clasping, margins serrate to pinnate, teeth or lobes 8–28, perpendicular to slightly antrorse, 0.8–7.5 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and generally needlelike trichomes, adaxial surface with simple grappling-hook and needlelike trichomes. Bracts: margins entire or toothed to pinnate. Flowers: petals golden yellow, 11.3–20.4 × 2.9–7.2 [–8.9] mm, apex acute to rounded, glabrous abaxially; stamens golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 10.4–17.8 × 1.9–5.2 [–5.6] mm, with or without anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles (5.4–) 8.5–10.9 (–13) mm. Capsules cupshaped to cylindric, [7.6–] 9.1–16.4 × 5.7–9.2 mm, length usually to 2 times diam., sometimes a few more, base tapering to rounded, not longitudinally ridged. Seeds: coat anticlinal cell-walls straight or sinuous, papillae 4–106 per cell.

Distribution

V12 176-distribution-map.jpg

Ariz., Calif., Colo., N.Mex., Tex., Utah, n Mexico

Discussion

Varieties 4 (3 in the flora).

Variety pinacatensis J. J. Schenk & L. Hufford is known from the Mexican state of Sonora.

Selected References

None.

Key

1 Seed coat anticlinal cell walls straight, papillae 4–6 per cell; margins of proximal leaf blades dentate. Mentzelia longiloba var. chihuahuaensis
1 Seed coat anticlinal cell walls sinuous, papillae 10–106 per cell; margins of proximal leaf blades pinnate. > 2
2 5 outermost stamens without anthers; leaf blade margin teeth or lobes perpendicular to leaf axis; seed coat cell papillae 67–106 per cell. Mentzelia longiloba var. longiloba
2 5 outermost stamens with anthers; leaf blade margin teeth or lobes slightly antrorse; seed coat cell papillae 10–21 per cell. Mentzelia longiloba var. yavapaiensis

No values specified.

... more about "Mentzelia longiloba"
petaloid +  and heteromorphic +
0.52 cm5.2 mm <br />0.0052 m <br /> (0.56 cm5.6 mm <br />0.0056 m <br />) +
1.04 cm10.4 mm <br />0.0104 m <br /> (1.78 cm17.8 mm <br />0.0178 m <br />) +
clawed +  and spatulate +
0.19 cm1.9 mm <br />0.0019 m <br /> (0.52 cm5.2 mm <br />0.0052 m <br />) +
Acute (?) +  and Rounded (?) +
John J. Schenk +  and Larry Hufford +
J. Darlington +
ridged +, tapering +  and rounded +
Mentzelia +
3.5 cm35 mm <br />0.035 m <br /> (11.2 cm112 mm <br />0.112 m <br />) +
unlobed;lobed;orbiculate;obovate;unlobed;lobed;orbiculate;obovate;unlobed;lobed;orbiculate;obovate;oblanceolate;spatulate;linear;lanceolate;elliptic;ovate;cordate;deltate;hastate +
0.23 cm2.3 mm <br />0.0023 m <br /> (1.53 cm15.3 mm <br />0.0153 m <br />) +
widest;4.3mm;27.1mm +
upcurved +  and antrorse +
distal +  and along entire stem +
0.76 cm7.6 mm <br />0.0076 m <br /> (0.91 cm9.1 mm <br />0.0091 m <br />) +
cupshaped +  and cylindric +
0.57 cm5.7 mm <br />0.0057 m <br /> (0.92 cm9.2 mm <br />0.0092 m <br />) +
Ariz. +, Calif. +, Colo. +, N.Mex. +, Tex. +, Utah +  and n Mexico +
curved +  and straight +
s--shaped +, clavate +, urceolate +, ovoid +, cylindric +, subcylindric +, lingulate +  and cup-shaped +
simple +  and complex +
free +  and adnate +
unlobed +  and filiform +
cauline +  and basal +
perpendicular +  and slightly antrorse +
serrate +  and pinnate +
toothed +  and pinnate +
apical +, subapical +  and inferior +
perpendicular +  and oriented +
not elongating +
inconspicuous +
0.72 cm7.2 mm <br />0.0072 m <br /> (0.89 cm8.9 mm <br />0.0089 m <br />) +
connate +  and distinct +
1.13 cm11.3 mm <br />0.0113 m <br /> (2.04 cm20.4 mm <br />0.0204 m <br />) +
spreading +  and erect +
hairy +  and glabrous +
Obovate (?) +, Oblanceolate (?) +, Elliptic (?) +, Ovate (?) +  and Spatulate (?) +
0.29 cm2.9 mm <br />0.0029 m <br /> (0.72 cm7.2 mm <br />0.0072 m <br />) +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Ann. Missouri Bot. Gard. +
flattened +  and ovoid +
persistent +
lanceolate +  and narrowly ovate +
Illustrated +
golden yellow +
adnate +, free +  and distinct +
included +  and exserted +
straight +
papillate +
3-lobed +  and lingulate +
1.09 cm10.9 mm <br />0.0109 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0.85 cm8.5 mm <br />0.0085 m <br /> (1.09 cm10.9 mm <br />0.0109 m <br />) +
Mentzelia multiflora subsp. longiloba +
Mentzelia longiloba +
Mentzelia sect. Bartonia +
species +
perpendicular +  and slightly antrorse +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
dendritic +  and unbranched +
sinuous +  and straight +
perennial +  and biennial +
plant +, candelabra-form +  and bushlike +