Mentzelia mexicana

H. J. Thompson & Zavortink

Wrightia 4: 21. 1968.

Common names: Mexico blazingstar
Treatment appears in FNA Volume 12. Treatment on page 521. Mentioned on page 501, 502.

Plants biennial, bushlike or candelabra-form. Stems solitary, erect, straight; branches distal or along entire stem, distal or proximal longest, antrorse, upcurved; hairy. Leaves: blade 24–82 × 11.7–29.1 mm, widest intersinus distance 3.4–19 mm; proximal oblanceolate or elliptic, margins dentate, serrate, or pinnate, teeth or lobes 6–16, slightly antrorse or perpendicular to leaf axis, 1.4–5.1 mm; distal elliptic to lanceolate, base usually not clasping, sometimes a few clasping, margins dentate, serrate, or pinnate, teeth or lobes 6–12, slightly antrorse or perpendicular to leaf axis, 2.5–6.7 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and usually needlelike trichomes, adaxial surface with simple grappling-hook and needlelike trichomes. Bracts: margins entire. Flowers: petals golden yellow, 10.2–15.3 (–17) × 2.5–6.2 mm, apex rounded, glabrous abaxially; stamens golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 9.9–14.4 (–16.7) × 2–4.8 mm, without anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles 4.5–10.9 mm. Capsules cupshaped, 7.1–12.8 × 5.6–8.4 mm, length to 2 times diam., base rounded, not longitudinally ridged. Seeds: coat anticlinal cell-walls straight, papillae 8–12 per cell. 2n = 18.


Phenology: Flowering Mar–Oct.
Habitat: Arroyos, knolls, steep slopes, gypsum and limestone clay and shale.
Elevation: 700–1500 m.

Distribution

V12 1019-distribution-map.jpg

Tex., Mexico (Chihuahua), Mexico (Coahuila), Mexico (Nuevo León), Mexico (Zacatecas)

Discussion

In the flora area, Mentzelia mexicana occurs in Brewster, Hudspeth, and Presidio counties.

Selected References

None.

Lower Taxa

None.

No values specified.

... more about "Mentzelia mexicana"
petaloid +  and heteromorphic +
1.44 cm14.4 mm <br />0.0144 m <br /> (1.67 cm16.7 mm <br />0.0167 m <br />) +
0.99 cm9.9 mm <br />0.0099 m <br /> (1.44 cm14.4 mm <br />0.0144 m <br />) +
clawed +  and spatulate +
0.2 cm2 mm <br />0.002 m <br /> (0.48 cm4.8 mm <br />0.0048 m <br />) +
John J. Schenk +  and Larry Hufford +
H. J. Thompson & Zavortink +
ridged +  and rounded +
Mentzelia +
2.4 cm24 mm <br />0.024 m <br /> (8.2 cm82 mm <br />0.082 m <br />) +
unlobed;lobed;orbiculate;obovate;unlobed;lobed;orbiculate;obovate;unlobed;lobed;orbiculate;obovate;oblanceolate;spatulate;linear;lanceolate;elliptic;ovate;cordate;deltate;hastate +
0.34 cm3.4 mm <br />0.0034 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
widest;11.7mm;29.1mm +
upcurved +  and antrorse +
distal +  and along entire stem +
cup-shaped +
0.56 cm5.6 mm <br />0.0056 m <br /> (0.84 cm8.4 mm <br />0.0084 m <br />) +
Mexico blazingstar +
elliptic;lanceolate +
Tex. +, Mexico (Chihuahua) +, Mexico (Coahuila) +, Mexico (Nuevo León) +  and Mexico (Zacatecas) +
700–1500 m. +
curved +  and straight +
s--shaped +, clavate +, urceolate +, ovoid +, cylindric +, subcylindric +, lingulate +  and cup-shaped +
simple +  and complex +
Arroyos, knolls, steep slopes, gypsum and limestone clay and shale. +
free +  and adnate +
unlobed +  and filiform +
cauline +  and basal +
perpendicular +  and antrorse +
entire +, serrate +, dentate +  and pinnate +
apical +, subapical +  and inferior +
perpendicular +  and oriented +
not elongating +
inconspicuous +
1.53 cm15.3 mm <br />0.0153 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
connate +  and distinct +
1.02 cm10.2 mm <br />0.0102 m <br /> (1.53 cm15.3 mm <br />0.0153 m <br />) +
spreading +  and erect +
hairy +  and glabrous +
Obovate (?) +, Oblanceolate (?) +, Elliptic (?) +, Ovate (?) +  and Spatulate (?) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.62 cm6.2 mm <br />0.0062 m <br />) +
Flowering Mar–Oct. +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
flattened +  and ovoid +
persistent +
lanceolate +  and narrowly ovate +
golden yellow +
adnate +, free +  and distinct +
included +  and exserted +
straight +
papillate +
3-lobed +  and lingulate +
0.45 cm4.5 mm <br />0.0045 m <br /> (1.09 cm10.9 mm <br />0.0109 m <br />) +
Mentzelia mexicana +
Mentzelia sect. Bartonia +
species +
perpendicular +  and antrorse +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.67 cm6.7 mm <br />0.0067 m <br />) +
dendritic +  and unbranched +
sinuous +  and straight +
plant +, candelabra-form +  and bushlike +