Mentzelia chrysantha

Engelmann

Bull. U.S. Geol. Geogr. Surv. Territ. 2: 237. 1876.

Common names: Golden blazingstar
EndemicConservation concern
Synonyms: Nuttallia chrysantha (Engelmann) Greene
Treatment appears in FNA Volume 12. Treatment on page 523. Mentioned on page 502.

Plants biennial, bushlike or candelabra-form. Stems solitary, erect, straight; branches distal or along entire stem, distal or proximal longest, antrorse, straight; hairy. Leaves: blade 38–113 × 8–20.5 (–25.2) mm, widest intersinus distance 5.4–12.8 mm; proximal oblanceolate, lanceolate, or elliptic, margins serrate to pinnate, teeth or lobes 14–22, slightly antrorse, 0.6–4.6 mm; distal elliptic or lanceolate, base not clasping, margins serrate to pinnate, teeth or lobes 6–22, slightly antrorse, 0.6–4 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and needlelike trichomes, adaxial surface with simple grappling-hook and needlelike trichomes. Bracts: margins toothed. Flowers: petals light to golden yellow, 12.5–21.4 × 3.8–6.7 mm, apex acute to rounded, glabrous abaxially; stamens light to golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 11.5–18.6 × 2–5.8 mm, without anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles 8.1–13.1 mm. Capsules cupshaped to cylindric, 9.4–16 × 5.1–7.7 mm, base tapering, not longitudinally ridged. Seeds: coat anticlinal cell-walls sinuous, papillae 29–35 per cell. 2n = 20.


Phenology: Flowering Jul–Sep.
Habitat: Steep hillsides, washes, clayey soils, sometimes rich in gypsum.
Elevation: 1600–1900 m.

Discussion

Mentzelia chrysantha occurs in Custer and Fremont counties.

Selected References

None.

Lower Taxa

None.
... more about "Mentzelia chrysantha"
petaloid +  and heteromorphic +
1.15 cm11.5 mm <br />0.0115 m <br /> (1.86 cm18.6 mm <br />0.0186 m <br />) +
clawed +  and spatulate +
0.2 cm2 mm <br />0.002 m <br /> (0.58 cm5.8 mm <br />0.0058 m <br />) +
Acute (?) +  and Rounded (?) +
John J. Schenk +  and Larry Hufford +
Engelmann +
ridged +  and tapering +
Mentzelia +
2.05 cm20.5 mm <br />0.0205 m <br /> (2.52 cm25.2 mm <br />0.0252 m <br />) +
3.8 cm38 mm <br />0.038 m <br /> (11.3 cm113 mm <br />0.113 m <br />) +
unlobed;lobed;orbiculate;obovate;unlobed;lobed;orbiculate;obovate;unlobed;lobed;orbiculate;obovate;oblanceolate;spatulate;linear;lanceolate;elliptic;ovate;cordate;deltate;hastate +
0.54 cm5.4 mm <br />0.0054 m <br /> (1.28 cm12.8 mm <br />0.0128 m <br />) +
widest;8mm;20.5mm +
distal +  and along entire stem +
0.94 cm9.4 mm <br />0.0094 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
cupshaped +  and cylindric +
0.51 cm5.1 mm <br />0.0051 m <br /> (0.77 cm7.7 mm <br />0.0077 m <br />) +
Golden blazingstar +
lanceolate;elliptic +
1600–1900 m. +
curved +  and straight +
s--shaped +, clavate +, urceolate +, ovoid +, cylindric +, subcylindric +, lingulate +  and cup-shaped +
simple +  and complex +
Steep hillsides, washes, clayey soils, sometimes rich in gypsum. +
free +  and adnate +
unlobed +  and filiform +
cauline +  and basal +
serrate +  and pinnate +
apical +, subapical +  and inferior +
perpendicular +  and oriented +
not elongating +
inconspicuous +
connate +  and distinct +
1.25 cm12.5 mm <br />0.0125 m <br /> (2.14 cm21.4 mm <br />0.0214 m <br />) +
spreading +  and erect +
hairy +  and glabrous +
Obovate (?) +, Oblanceolate (?) +, Elliptic (?) +, Ovate (?) +  and Spatulate (?) +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.67 cm6.7 mm <br />0.0067 m <br />) +
Flowering Jul–Sep. +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Bull. U.S. Geol. Geogr. Surv. Territ. +
flattened +  and ovoid +
persistent +
lanceolate +  and narrowly ovate +
Endemic +  and Conservation concern +
light +  and golden yellow +
adnate +, free +  and distinct +
included +  and exserted +
straight +
papillate +
3-lobed +  and lingulate +
0.81 cm8.1 mm <br />0.0081 m <br /> (1.31 cm13.1 mm <br />0.0131 m <br />) +
Nuttallia chrysantha +
Mentzelia chrysantha +
Mentzelia sect. Bartonia +
species +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
dendritic +  and unbranched +
sinuous +  and straight +
plant +, candelabra-form +  and bushlike +