Mentzelia procera

(Wooton & Standley) J. J. Schenk & L. Hufford

Madroño 57: 247. 2010.

Common names: Upright blazingstar
Basionym: Nuttallia procera Wooton & Standley Contr. U.S. Natl. Herb. 16: 150. 1913
Synonyms: Mentzelia pumila var. procera (Wooton & Standley) J. Darlington
Treatment appears in FNA Volume 12. Treatment on page 523. Mentioned on page 502, 524.

Plants biennial, usually candelabra-form, rarely bushlike. Stems solitary, erect, straight; branches distal or occasionally along entire stem, distal or proximal longest, antrorse, straight or upcurved; hairy. Leaves: blade 38.3–108 × 5.3–14.9 mm, widest intersinus distance 1.7–3.9 mm; proximal oblanceolate to elliptic, margins pinnate, lobes 14–22(–26), perpendicular to leaf axis, 1.8–4.5 mm; distal elliptic to lanceolate, base not clasping, margins pinnate, lobes 6–18, perpendicular to leaf axis, 1.3–4.5 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and occasionally needlelike trichomes, adaxial surface with simple grappling-hook and needlelike trichomes. Bracts: margins entire or toothed to pinnate. Flowers: petals light yellow, 9.5–16.8 × 3.4–5.6 mm, apex usually rounded, rarely acute, glabrous abaxially; stamens light yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 8.2–14.6 × 2.3–3.4 mm, without anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles 7.1–12.6 mm. Capsules cup-shaped to cylindric, 9.8–18.8 × 5.2–7.3 mm, base tapering, not longitudinally ridged. Seeds: coat anticlinal cell walls sinuous, papillae 28–68 per cell.

Phenology: Flowering Jul–Aug.
Habitat: Dry hillsides, roadcuts, roadsides, sandy, clayey, or silty soils.
Elevation: 1400–2500 m.


V12 552-distribution-map.jpg

Ariz., Colo., N.Mex., n Mexico.


Selected References


Lower Taxa

... more about "Mentzelia procera"
John J. Schenk +  and Larry Hufford +
(Wooton & Standley) J. J. Schenk & L. Hufford +
Nuttallia procera +
Upright blazingstar +
Ariz. +, Colo. +, N.Mex. +  and n Mexico. +
1400–2500 m. +
Dry hillsides, roadcuts, roadsides, sandy, clayey, or silty soils. +
Flowering Jul–Aug. +
Mentzelia pumila var. procera +
Mentzelia procera +
Mentzelia sect. Bartonia +
species +