Mentzelia laevicaulis var. parviflora

(Douglas) C. L. Hitchcock

in C. L. Hitchcock et al., Vasc. Pl. Pac. N.W. 3: 455. 1961.

Common names: Small-flowered blazingstar
Endemic
Basionym: Bartonia parviflora Douglas in W. J. Hooker, Fl. Bor.-Amer. 1: 221. 1832
Synonyms: Mentzelia brandegeei S. Watson M. douglasii H. St. John
Treatment appears in FNA Volume 12. Treatment on page 514. Mentioned on page 515.

Leaf blades 17.4–196 × 6.7–24.7 mm, widest intersinus distance 2.4–7.2 mm; proximal oblanceolate, lanceolate, or elliptic, margin lobes 14–24, 3.5–6.3 × 3.1–6.6 mm; distal with base clasping, margin lobes 6–14, 2.2–13.8 × 0.8–6.2 mm; adaxial surfaces with simple grappling-hook and needlelike trichomes. Bracts 8.4–25 × 1–1.3 mm, margins entire or toothed. Flowers: petals 23.5–40 × 3–9 mm; 5 outermost stamens 17.7–29 × 0.5–1.4 mm. Capsules cup-shaped to cylindric, 19–28 × 6.3–9.6 mm. Seed coat: papillae 4–6 per cell.


Phenology: Flowering Jun–Aug.
Habitat: Roadsides, slopes, riverbanks, dry sandy and gravelly soils.
Elevation: 200–550 m.

Discussion

Variety parviflora was first described at the specific level by Douglas as Bartonia parviflora. The combination Mentzelia parviflora (Douglas) J. F. McBride is a later homonym of M. parviflora A. Heller, which is a synonym of M. albicaulis in sect. Trachyphytum.

Selected References

None.

Lower Taxa

None.
John J. Schenk +  and Larry Hufford +
(Douglas) C. L. Hitchcock +
Bartonia parviflora +
Small-flowered blazingstar +
B.C. +, Idaho +  and Wash. +
200–550 m. +
Roadsides, slopes, riverbanks, dry sandy and gravelly soils. +
Flowering Jun–Aug. +
in C. L. Hitchcock et al., Vasc. Pl. Pac. N.W. +
Mentzelia brandegeei +  and M. douglasii +
Mentzelia laevicaulis var. parviflora +
Mentzelia laevicaulis +
variety +