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 cupshaped 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.
petaloid +  and heteromorphic +
elliptic +  and linear to narrowly +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
1.77 cm17.7 mm <br />0.0177 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
not clawed +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
John J. Schenk +  and Larry Hufford +
(Douglas) C. L. Hitchcock in C. L. Hitchcock et al. +
ridged +, rounded +  and tapering +
Bartonia parviflora +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.72 cm7.2 mm <br />0.0072 m <br />) +
1.74 cm17.4 mm <br />0.0174 m <br /> (19.6 cm196 mm <br />0.196 m <br />) +
widest;6.7mm;24.7mm +
1.74 cm17.4 mm <br />0.0174 m <br /> (19.6 cm196 mm <br />0.196 m <br />) +
unlobed;lobed;orbiculate;obovate;unlobed;lobed;orbiculate;obovate;unlobed;lobed;orbiculate;obovate;oblanceolate;spatulate;linear;lanceolate;elliptic;ovate;cordate;deltate;hastate +
0.24 cm2.4 mm <br />0.0024 m <br /> (2.46 cm24.6 mm <br />0.0246 m <br />) +
widest;6.7mm;40.4mm +
0.84 cm8.4 mm <br />0.0084 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
upcurved +  and antrorse +
distal +  and along entire stem +
glabrescent +  and hairy +
1.9 cm19 mm <br />0.019 m <br /> (2.8 cm28 mm <br />0.028 m <br />) +
cupshaped +  and cylindric +
0.63 cm6.3 mm <br />0.0063 m <br /> (0.96 cm9.6 mm <br />0.0096 m <br />) +
Small-flowered blazingstar +
B.C. +, Idaho +  and Wash. +
200–550 m. +
curved +  and straight +
s--shaped +, clavate +, urceolate +, ovoid +, cylindric +, subcylindric +, lingulate +  and cup-shaped +
Roadsides, slopes, riverbanks, dry sandy and gravelly soils. +
free +  and adnate +
unlobed +  and filiform +
cauline +  and basal +
pinnate +  and entire +
0.22 cm2.2 mm <br />0.0022 m <br /> (1.38 cm13.8 mm <br />0.0138 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.62 cm6.2 mm <br />0.0062 m <br />) +
toothed +  and entire +
1.77 cm17.7 mm <br />0.0177 m <br /> (2.9 cm29 mm <br />0.029 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
apical +, subapical +  and inferior +
perpendicular +  and oriented +
not elongating +
inconspicuous +
connate +  and distinct +
2.35 cm23.5 mm <br />0.0235 m <br /> (4 cm40 mm <br />0.04 m <br />) +
spreading +  and erect +
hairy +  and glabrous +
Obovate (?) +, Oblanceolate (?) +, Elliptic (?) +, Ovate (?) +  and Spatulate (?) +
0.3 cm3 mm <br />0.003 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
Flowering Jun–Aug. +
elliptic +, lanceolate +  and oblanceolate +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Vasc. Pl. Pac. N.W. +
flattened +  and ovoid +
persistent +
lanceolate +  and narrowly ovate +
golden yellow +
adnate +, free +  and distinct +
included +  and exserted +
straight +
papillate +
3-lobed +  and lingulate +
2.04 cm20.4 mm <br />0.0204 m <br /> (5.7 cm57 mm <br />0.057 m <br />) +
Mentzelia brandegeei +  and M. douglasii +
Mentzelia laevicaulis var. parviflora +
Mentzelia laevicaulis +
variety +
dendritic +  and unbranched +
sinuous +  and straight +
perennial +  and biennial +
plant +  and bushlike +