Mentzelia oreophila

J. Darlington

Ann. Missouri Bot. Gard. 21: 175. 1934.

Common names: Argus blazingstar
Endemic
Treatment appears in FNA Volume 12. Treatment on page 510. Mentioned on page 500, 509.

Plants perennial, bushlike, with subterranean caudices. Stems multiple, erect, straight; branches distal or along entire stem, distal longest or all ± equal, antrorse, upcurved; hairy. Leaves: blade 17–103 × 7.6–41.2 mm, widest intersinus distance 5.1–35.3 mm; proximal oblanceolate to elliptic, margins serrate, teeth 6–22, slightly antrorse, 0.4–5.3 mm; distal elliptic, lanceolate, or deltate, base clasping, margins serrate, teeth 6–16, slightly antrorse, 0.5–4.2 mm; abaxial surface with complex grappling-hook trichomes, adaxial surface with complex grappling-hook and needlelike trichomes, both surfaces green, moderately hairy. Bracts: margins entire. Flowers: petals golden yellow, 7–14.5 (–16.2) × 1.7–5.2 mm, apex rounded, glabrous abaxially; stamens golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 5.3–11.1 (–15.4) × 0.6–4.4 mm, with anthers, second whorl with anthers; anthers twisted after dehiscence, epidermis smooth; styles 3.8–8.1 mm. Capsules cupshaped, 5.8–9 × 5.2–8.8 mm, base rounded, not longitudinally ridged. Seeds: coat anticlinal cell-walls straight, papillae 6–17 per cell. 2n = 22.


Phenology: Flowering Feb–Oct.
Habitat: Sparsely vegetated slopes, roadcuts, loose, rocky and sandy limestone soils.
Elevation: 400–1600 m.

Discussion

Mentzelia oreophila is found in Inyo, Riverside, and San Bernardino counties, California, and Clark, Esmeralda, Lincoln, and Nye counties, Nevada. The California populations have a smaller stature than those in Nevada, and phylogenetic analysis indicated that the species is potentially polyphyletic.

Selected References

None.

Lower Taxa

None.

No values specified."not elongating" is not a number.

... more about "Mentzelia oreophila"
petaloid +  and heteromorphic +
1.11 cm11.1 mm <br />0.0111 m <br /> (1.54 cm15.4 mm <br />0.0154 m <br />) +
0.53 cm5.3 mm <br />0.0053 m <br /> (1.11 cm11.1 mm <br />0.0111 m <br />) +
clawed +  and spatulate +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.44 cm4.4 mm <br />0.0044 m <br />) +
rounded +
John J. Schenk +  and Larry Hufford +
J. Darlington +
ridged +  and rounded +
Mentzelia +
1.7 cm17 mm <br />0.017 m <br /> (10.3 cm103 mm <br />0.103 m <br />) +
unlobed;lobed;orbiculate;obovate;unlobed;lobed;orbiculate;obovate;unlobed;lobed;orbiculate;obovate;oblanceolate;spatulate;linear;lanceolate;elliptic;ovate;cordate;deltate;hastate +
0.51 cm5.1 mm <br />0.0051 m <br /> (3.53 cm35.3 mm <br />0.0353 m <br />) +
along entire stem +  and distal +
0.58 cm5.8 mm <br />0.0058 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
cup-shaped +
0.52 cm5.2 mm <br />0.0052 m <br /> (0.88 cm8.8 mm <br />0.0088 m <br />) +
subterranean +
Argus blazingstar +
deltate;lanceolate;deltate;lanceolate;elliptic +
all +  and longest +
upcurved +  and antrorse +
Calif. +  and Nev. +
400–1600 m. +
curved +  and straight +
s--shaped +, clavate +, urceolate +, ovoid +, cylindric +, subcylindric +, lingulate +  and cup-shaped +
Sparsely vegetated slopes, roadcuts, loose, rocky and sandy limestone soils. +
free +  and adnate +
unlobed +  and filiform +
cauline +  and basal +
entire +  and serrate +
apical +, subapical +  and inferior +
perpendicular +  and oriented +
inconspicuous +
1.45 cm14.5 mm <br />0.0145 m <br /> (1.62 cm16.2 mm <br />0.0162 m <br />) +
golden yellow +
connate +  and distinct +
7mm;14.5mm +
spreading +  and erect +
hairy +  and glabrous +
obovate +, oblanceolate +, elliptic +, ovate +  and spatulate +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.52 cm5.2 mm <br />0.0052 m <br />) +
Flowering Feb–Oct. +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Ann. Missouri Bot. Gard. +
flattened +  and ovoid +
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 +
golden yellow +
adnate +, free +  and distinct +
included +  and exserted +
straight +
papillate +
3-lobed +  and lingulate +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.81 cm8.1 mm <br />0.0081 m <br />) +
Mentzelia oreophila +
Mentzelia sect. Bartonia +
species +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.42 cm4.2 mm <br />0.0042 m <br />) +
dendritic +  and unbranched +
sinuous +  and straight +
plant +  and bushlike +