E-Flora BC: Electronic Atlas of the Flora of British Columbia

Mentzelia laevicaulis (Hook.) Torr. & A. Gray var. laevicaulis
blazing-star (smoothstem blazingstar)
Loasaceae (Loasa family)

Introduction to Vascular Plants

© Virginia Skilton  Email the photographer   (Photo ID #9065)

E-Flora BC Static Map
Distribution of Mentzelia laevicaulis var. laevicaulis
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Species Information

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General:
Biennial or short-lived perennial herb from a deep taproot; stems ascending to erect, several, branched, angular, harshly barbed-hairy throughout but nearly glabrous near the bases, 0.3-1 m tall.
Leaves:
Basal leaves linear to shallowly lobed, 10-15 cm long; stem leaves alternate, unstalked, oblong to egg-shaped but less deeply lobed.
Flowers:
Inflorescence of numerous flowers in a compact terminal or axillary cluster; petals 5, lemon yellow, 2.5-8 cm long; calyces 1-2.5 mm long; stamens 2/3 the length of the petals; bracts linear.
Fruits:
Capsules, oblong, 1.5-3.5 cm long; seeds numerous, flattened, winged, greyish-green or brownish.
Notes:
Two, sometimes difficult to separate, varieties are recognized in BC:

1. Petals at least 4-8 cm long; fruits usually over 2 cm long ...................var. laevicaulis

1. Petals 1.5-4 cm long; fruits usually less than 2 cm long...................... var. parviflora (Dougl. ex Hook.) C.L. Hitchc.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry slopes in the steppe and lower montane zones; frequent in SC BC; S to MT, UT and CA.

Source: The Illustrated Flora of British Columbia

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Mentzelia laevicaulis var. acuminata (Rydb.) A. Nelson & J.F. Macbr.
Nuttallia laevicaulis (Hook.) Greene

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References