Mentzelia integra

(M. E. Jones) Tidestrom

Contr. U.S. Natl. Herb. 25: 363. 1925.

Common names: Virgin blazingstar
Endemic
Basionym: Mentzelia multiflora var. integra M. E. Jones Proc. Calif. Acad. Sci., ser. 2, 5: 689. 1895
Synonyms: Nuttallia lobata Rydberg 1913
Treatment appears in FNA Volume 12. Treatment on page 521. Mentioned on page 502.

Plants winter-annual or biennial, candelabra-form. Stems solitary, erect, straight; branches distal or along entire stem, distal or proximal longest, antrorse, straight, proximal not decumbent; hairy or glabrescent. Leaves: blade (23–) 29–78.4 × 3–14.6 mm, widest intersinus distance 1.6–8.5 mm; proximal oblanceolate or elliptic, margins dentate to serrate, teeth 4–12, proximal sides slightly antrorse, distal sides perpendicular to leaf axis, 0.8–5.3 mm; distal oblanceolate, elliptic, lanceolate, or linear, base not clasping, tapered, margins usually dentate to serrate, rarely entire, teeth (0–) 2–10, proximal sides antrorse, distal sides perpendicular to leaf axis, 0.4–5.3 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and needlelike trichomes, largest trichomes with pearly white bases, adaxial surface with needlelike trichomes. Bracts: margins entire. Flowers: petals golden yellow, 8.6–13.9 (–17.4) × 2.9–4.7 (–6.1) mm, apex rounded, glabrous abaxially; stamens golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 6.7–13.2 (–15.4) × 1.7–4.3 mm, usually without, rarely with, anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles 4.8–11.3 mm. Capsules cupshaped, 6.2–11.4 (–13) × 6–8.4 mm, base rounded, not longitudinally ridged. Seeds: coat anticlinal cell-walls wavy, papillae 5–13 per cell. 2n = 20.


Phenology: Flowering May–Sep.
Habitat: Roadsides, outcrops, hillsides, washes, dunes, sandy, gravelly, or volcanic soils.
Elevation: 800–1800 m.

Discussion

Mentzelia integra is found in northwestern Arizona, southeastern Nevada, and southwestern Utah.

Selected References

None.

Lower Taxa

None.
... more about "Mentzelia integra"
petaloid +  and heteromorphic +
1.32 cm13.2 mm <br />0.0132 m <br /> (1.54 cm15.4 mm <br />0.0154 m <br />) +
0.67 cm6.7 mm <br />0.0067 m <br /> (1.32 cm13.2 mm <br />0.0132 m <br />) +
clawed +  and spatulate +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.43 cm4.3 mm <br />0.0043 m <br />) +
John J. Schenk +  and Larry Hufford +
(M. E. Jones) Tidestrom +
ridged +, rounded +  and tapered +
Mentzelia multiflora var. integra +
2.3 cm23 mm <br />0.023 m <br /> (2.9 cm29 mm <br />0.029 m <br />) +
2.9 cm29 mm <br />0.029 m <br /> (7.84 cm78.4 mm <br />0.0784 m <br />) +
unlobed;lobed;orbiculate;obovate;unlobed;lobed;orbiculate;obovate;unlobed;lobed;orbiculate;obovate;oblanceolate;spatulate;linear;lanceolate;elliptic;ovate;cordate;deltate;hastate +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.85 cm8.5 mm <br />0.0085 m <br />) +
widest;3mm;14.6mm +
distal +  and along entire stem +
1.14 cm11.4 mm <br />0.0114 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0.62 cm6.2 mm <br />0.0062 m <br /> (1.14 cm11.4 mm <br />0.0114 m <br />) +
cup-shaped +
0.6 cm6 mm <br />0.006 m <br /> (0.84 cm8.4 mm <br />0.0084 m <br />) +
Virgin blazingstar +
linear +, lanceolate +, elliptic +  and oblanceolate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.53 cm5.3 mm <br />0.0053 m <br />) +
Ariz. +, Nev. +  and Utah. +
800–1800 m. +
curved +  and straight +
s--shaped +, clavate +, urceolate +, ovoid +, cylindric +, subcylindric +, lingulate +  and cup-shaped +
complex +  and simple +
Roadsides, outcrops, hillsides, washes, dunes, sandy, gravelly, or volcanic soils. +
free +  and adnate +
unlobed +  and filiform +
cauline +  and basal +
entire +, usually dentate +  and serrate +
apical +, subapical +  and inferior +
perpendicular +  and oriented +
not elongating +
inconspicuous +
1.39 cm13.9 mm <br />0.0139 m <br /> (1.74 cm17.4 mm <br />0.0174 m <br />) +
0.47 cm4.7 mm <br />0.0047 m <br /> (0.61 cm6.1 mm <br />0.0061 m <br />) +
connate +  and distinct +
0.86 cm8.6 mm <br />0.0086 m <br /> (1.39 cm13.9 mm <br />0.0139 m <br />) +
spreading +  and erect +
hairy +  and glabrous +
Obovate (?) +, Oblanceolate (?) +, Elliptic (?) +, Ovate (?) +  and Spatulate (?) +
0.29 cm2.9 mm <br />0.0029 m <br /> (0.47 cm4.7 mm <br />0.0047 m <br />) +
Flowering May–Sep. +
elliptic +  and oblanceolate +
glabrescent +  and hairy +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Contr. U.S. Natl. Herb. +
flattened +  and ovoid +
persistent +
lanceolate +  and narrowly ovate +
golden yellow +
adnate +, free +  and distinct +
included +  and exserted +
straight +
papillate +
3-lobed +  and lingulate +
0.48 cm4.8 mm <br />0.0048 m <br /> (1.13 cm11.3 mm <br />0.0113 m <br />) +
Nuttallia lobata +
Mentzelia integra +
Mentzelia sect. Bartonia +
species +
dendritic +  and unbranched +
sinuous +  and straight +
biennial +  and winter-annual +