Mentzelia cronquistii

H. J. Thompson & Prigge

Great Basin Naturalist 46: 550, figs. 2, 3A,B, 4A. 1986.

Common names: Cronquist’s blazingstar
Synonyms: Mentzelia marginata var. cronquistii (H. J. Thompson & Prigge) N. H. Holmgren & P. K. Holmgren Nuttallia cronquistii (H. J. Thompson & Prigge) W. A. Weber
Treatment appears in FNA Volume 12. Treatment on page 506. Mentioned on page 499.

Plants biennial, candelabra-form. Stems solitary, erect, straight; branches distal or along entire stem, proximal longer than distal, all usually extending to near the distal end of plant, antrorse, straight; hairy. Leaves: blade 21–101 × 4–10.7(–19.3) mm, widest intersinus distance 1.8–7.3(–12.6) mm; proximal oblanceolate, lanceolate, or elliptic, margins dentate to pinnate, teeth or lobes 8–28, perpendicular to leaf axis, 1.2–6(–9) mm, always some more than 4 mm; distal oblanceolate, elliptic, or lanceolate, base not clasping, margins dentate to pinnate, teeth or lobes 6–18, perpendicular to leaf axis, 1.1–5(–6.9) mm; abaxial surface with simple grappling-hook, complex grappling-hook, and needlelike trichomes, adaxial surface with simple grappling-hook, needlelike, and occasionally complex grappling-hook trichomes. Bracts: margins entire or toothed to pinnate. Flowers: petals golden yellow, 9–16.6 × 2.5–5.1 mm, apex usually rounded, rarely acute, hairy abaxially; stamens golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 7.3–13.2 × 1.8–4.3 mm, usually without, rarely with anthers, second whorl with anthers; anthers straight after dehiscence, epidermis papillate or not; styles 6.5–10 mm. Capsules cup-shaped, 5.9–10.6(–11.4) × 5–7.6 mm, base tapering to rounded, not longitudinally ridged. Seeds: coat anticlinal cell walls wavy, papillae 8–13 per cell. 2n = 20.

Phenology: Flowering May–Nov.
Habitat: Sandy and rocky soils, washes, roadside banks, steep slopes.
Elevation: 800–2300 m.


V12 518-distribution-map.jpg

Ariz., Colo., N.Mex., Utah.


Selected References


Lower Taxa

... more about "Mentzelia cronquistii"
John J. Schenk +  and Larry Hufford +
H. J. Thompson & Prigge +
Mentzelia +
Cronquist’s blazingstar +
Ariz. +, Colo. +, N.Mex. +  and Utah. +
800–2300 m. +
Sandy and rocky soils, washes, roadside banks, steep slopes. +
Flowering May–Nov. +
Great Basin Naturalist +
Mentzelia marginata var. cronquistii +  and Nuttallia cronquistii +
Mentzelia cronquistii +
Mentzelia sect. Bartonia +
species +