Page author: David Giblin
Mentzelia laevicaulis
giant blazing-star
WTU specimens
Other herbaria

Distribution: Chiefly east of the Cascades in Washington; British Columbia south to California, east to Montana and Colorado.

Habitat: Dry, often rocky or gravelly soil, desert valleys to lower mountains.

Flowers: July-September

Origin: Native

Conservation Status: Not of concern

Description:
General:

Biennial or short-lived perennial from a deep taproot, the stem 3-10 dm. tall, single and branched, but often appearing multi-stemmed when branched near the base; harshly scabrid-pubescent.

Leaves:

Leaves alternate, the lower ones oblanceolate, with slender petioles, deeply pinnatifid, the lobes often angled backward, up to 15 cm. long; upper leaves sessile, oblong to ovate-oblong, more shallowly lobed.

Flowers:

Flowers solitary and terminal on branch ends and often in the upper leaf axils, each subtended by 1-several entire or few-toothed bracts; calyx lobes 5, linear, 1.5 -4 cm. long; petals 5, lemon yellow, 2.5-8 cm. long, narrowly oblong or oblong-lanceolate; stamens very numerous, 2/3 the length of the petals, the 5 outer ones without anthers, much widened and petaloid, alternate with the petals; style 1, stigma 3-4 mm., ovary inferior, 1-celled.

Fruits:

Capsule 1.5-3.5 cm. long.

Accepted Name:
Mentzelia laevicaulis (Douglas) Torr. & A. Gray

Synonyms & Misapplications:
Nuttallia laevicaulis (Douglas) Greene
Infraspecies:
var. laevicaulis – giant blazing-star    Chiefly east of the Cascades, British Columbia to California, east to Montana and Colorado
var. parviflora – giant blazing-star
Additional Resources:

PNW Herbaria: Specimen records of Mentzelia laevicaulis in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Mentzelia laevicaulis checklist entry.

E-Flora BC: Mentzelia laevicaulis atlas page.

CalPhotos: Mentzelia laevicaulis photos.

USDA Plants: Mentzelia laevicaulis information.

48 photographs:
Group by