Mentzelia laevicaulis var. laevicaulis

Common names: Giant blazingstar
IllustratedEndemic
Synonyms: Mentzelia acuminata (Rydberg) Tidestrom
Treatment appears in FNA Volume 12. Treatment on page 514.

Leaf-blades 39.8–154 × 8.4–40.4 mm, widest intersinus distance 4.9–24.6 mm; proximal oblanceolate to elliptic, margin lobes 18–44, 2.5–8.9 × 3.6–9.6 mm; distal with base clasping or non-clasping, margin lobes 14–42, 2.1–6.1 × 3.2–6.3 mm; adaxial surfaces with needlelike trichomes. Bracts 13–29 × 1–5 mm, margins entire or pinnate. Flowers: petals 43–70 × 8–17.3 mm; 5 outermost stamens 39–55 × 1–2 (–2.5) mm. Capsules cylindric, 22–43 × 8–11.1 mm. Seed-coat: papillae 4–11 per cell.


Phenology: Flowering May–Oct.
Habitat: Dry streambed bottoms and banks, gravel bars, hillside slopes, roadsides, roadcuts, sand dunes.
Elevation: 0–3000 m.

Distribution

V12 885-distribution-map.jpg

Ariz., Calif., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.

Discussion

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) Torrey & A. Gray +
non-clasping +  and clasping +
ridged +, rounded +  and tapering +
Bartonia laevicaulis +
0.49 cm4.9 mm <br />0.0049 m <br /> (2.46 cm24.6 mm <br />0.0246 m <br />) +
3.98 cm39.8 mm <br />0.0398 m <br /> (15.4 cm154 mm <br />0.154 m <br />) +
widest;8.4mm;40.4mm +
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 +
1.3 cm13 mm <br />0.013 m <br /> (2.9 cm29 mm <br />0.029 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
upcurved +  and antrorse +
distal +  and along entire stem +
glabrescent +  and hairy +
2.2 cm22 mm <br />0.022 m <br /> (4.3 cm43 mm <br />0.043 m <br />) +
cylindric +
0.8 cm8 mm <br />0.008 m <br /> (1.11 cm11.1 mm <br />0.0111 m <br />) +
Giant blazingstar +
Ariz. +, Calif. +, Idaho +, Mont. +, Nev. +, Oreg. +, Utah +, Wash. +  and Wyo. +
0–3000 m. +
curved +  and straight +
s--shaped +, clavate +, urceolate +, ovoid +, cylindric +, subcylindric +, lingulate +  and cup-shaped +
complex +  and simple +
Dry streambed bottoms and banks, gravel bars, hillside slopes, roadsides, roadcuts, sand dunes. +
free +  and adnate +
unlobed +  and filiform +
cauline +  and basal +
pinnate +  and entire +
0.21 cm2.1 mm <br />0.0021 m <br /> (0.61 cm6.1 mm <br />0.0061 m <br />) +
0.32 cm3.2 mm <br />0.0032 m <br /> (0.63 cm6.3 mm <br />0.0063 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
3.9 cm39 mm <br />0.039 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
apical +, subapical +  and inferior +
perpendicular +  and oriented +
not elongating +
inconspicuous +
connate +  and distinct +
4.3 cm43 mm <br />0.043 m <br /> (7 cm70 mm <br />0.07 m <br />) +
spreading +  and erect +
hairy +  and glabrous +
Obovate (?) +, Oblanceolate (?) +, Elliptic (?) +, Ovate (?) +  and Spatulate (?) +
0.8 cm8 mm <br />0.008 m <br /> (1.73 cm17.3 mm <br />0.0173 m <br />) +
Flowering May–Oct. +
oblanceolate +  and elliptic +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Fl. N. Amer. +
flattened +  and ovoid +
persistent +
lanceolate +  and narrowly ovate +
Illustrated +  and Endemic +
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 acuminata +
Mentzelia laevicaulis var. laevicaulis +
Mentzelia laevicaulis +
variety +
dendritic +  and unbranched +
sinuous +  and straight +
perennial +  and biennial +
plant +  and bushlike +