Mentzelia sivinskii

J. J. Schenk & L. Hufford

Madroño 57: 253, fig. 4A. 2010.

Common names: Sivinski’s blazingstar
Endemic
Synonyms: Mentzelia linearifolia S. L. Welsh & N. D. Atwood
Treatment appears in FNA Volume 12. Treatment on page 522. Mentioned on page 502, 523.

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 32.8–112.2 × 2.9–11.4 mm, widest intersinus distance 1–2.9 mm; proximal oblanceolate to elliptic, margins pinnate, lobes 18–24, perpendicular to leaf axis, 0.8–4 mm; distal elliptic to lanceolate, base not clasping, margins pinnate, lobes 6–16, perpendicular to leaf axis, 1–5.1 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and needlelike trichomes, adaxial surface with needlelike and occasionally simple grappling-hook trichomes. Bracts: margins entire. Flowers: petals light to golden yellow, 9–14.7 × 3.1–6.4 mm, apex rounded, glabrous abaxially; stamens light to golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 6.3–11.5 × 2.4–4.9 mm, with anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles 4.6–9.9 mm. Capsules cupshaped, 8.2–12.7 × 5.1–7.7 mm, base tapering to rounded, not longitudinally ridged. Seeds: coat anticlinal cell-walls sinuous, papillae 12–21 per cell. 2n = 18.


Phenology: Flowering Jun–Aug.
Habitat: Knolls, slopes, and grassland roadsides, gypsum or brown clayey soils.
Elevation: 1500–1900 m.

Discussion

Mentzelia sivinskii is known from La Plata County, Colorado, and Rio Arriba and San Juan counties, New Mexico.

Selected References

None.

Lower Taxa

None.
... more about "Mentzelia sivinskii"
petaloid +  and heteromorphic +
0.63 cm6.3 mm <br />0.0063 m <br /> (1.15 cm11.5 mm <br />0.0115 m <br />) +
clawed +  and spatulate +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.49 cm4.9 mm <br />0.0049 m <br />) +
John J. Schenk +  and Larry Hufford +
J. J. Schenk & L. Hufford +
ridged +, tapering +  and rounded +
Mentzelia +
3.28 cm32.8 mm <br />0.0328 m <br /> (11.22 cm112.2 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 +
0.1 cm1 mm <br />0.001 m <br /> (0.29 cm2.9 mm <br />0.0029 m <br />) +
widest;2.9mm;11.4mm +
distal +  and along entire stem +
0.82 cm8.2 mm <br />0.0082 m <br /> (1.27 cm12.7 mm <br />0.0127 m <br />) +
cup-shaped +
0.51 cm5.1 mm <br />0.0051 m <br /> (0.77 cm7.7 mm <br />0.0077 m <br />) +
Sivinski’s blazingstar +
elliptic;lanceolate +
Colo. +  and N.Mex. +
1500–1900 m. +
curved +  and straight +
s--shaped +, clavate +, urceolate +, ovoid +, cylindric +, subcylindric +, lingulate +  and cup-shaped +
complex +  and simple +
Knolls, slopes, and grassland roadsides, gypsum or brown clayey soils. +
free +  and adnate +
unlobed +  and filiform +
cauline +  and basal +
perpendicular +
entire +  and pinnate +
apical +, subapical +  and inferior +
perpendicular +  and oriented +
not elongating +
inconspicuous +
connate +  and distinct +
0.9 cm9 mm <br />0.009 m <br /> (1.47 cm14.7 mm <br />0.0147 m <br />) +
spreading +  and erect +
hairy +  and glabrous +
Obovate (?) +, Oblanceolate (?) +, Elliptic (?) +, Ovate (?) +  and Spatulate (?) +
0.31 cm3.1 mm <br />0.0031 m <br /> (0.64 cm6.4 mm <br />0.0064 m <br />) +
Flowering Jun–Aug. +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
flattened +  and ovoid +
persistent +
lanceolate +  and narrowly ovate +
light +  and golden yellow +
adnate +, free +  and distinct +
included +  and exserted +
straight +
papillate +
3-lobed +  and lingulate +
0.46 cm4.6 mm <br />0.0046 m <br /> (0.99 cm9.9 mm <br />0.0099 m <br />) +
Mentzelia linearifolia +
Mentzelia sivinskii +
Mentzelia sect. Bartonia +
species +
dendritic +  and unbranched +
sinuous +  and straight +
plant +, candelabra-form +  and bushlike +