Mentzelia albescens
Mentzelia pterosperma
wavy-leaf blazingstar
wing-seed blazing star, wingseed stickleaf
solitary, erect, straight;
branches distal, distal longest, antrorse, straight; hairy.
solitary, erect, straight;
branches distal, distal longest, antrorse, straight, hairy.
blade 31–92(–157) × 10.5–27.6(–41) mm, widest intersinus distance 5.2–23.3(–29) mm;
proximal lanceolate or elliptic, margins serrate to pinnate, teeth or lobes 8–22, slightly antrorse, 1.8–6 mm;
distal lanceolate, base clasping, margins usually serrate to pinnate, occasionally entire, teeth or lobes (0–)10–20, slightly antrorse, 1.4–7.6 mm;
abaxial surface with simple grappling-hook, complex grappling-hook, and needlelike trichomes, adaxial surface with simple grappling-hook and needlelike trichomes.
blade 13.8–78 × 3.8–20 mm, widest intersinus distance 2.5–15.8 mm;
proximal oblanceolate to elliptic, margins entire or serrate to pinnate, teeth or lobes (0–)8–14(–22), slightly antrorse, 0.3–5.3 mm;
distal elliptic to lanceolate, base usually clasping, rarely a few not clasping, margins usually serrate to pinnate, occasionally entire, teeth or lobes (0–)6–18, slightly antrorse, 2.8–4.3(–6.1) mm;
abaxial surface with simple grappling-hook, occasionally complex grappling-hook, and rarely needlelike trichomes, adaxial surface occasionally with simple grappling-hook and needlelike trichomes.
margins entire.
margins usually entire, rarely pinnate.
petals golden yellow, 5.7–9.2 × 1.3–3 mm, apex usually acute, occasionally rounded, glabrous abaxially;
stamens golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 4.7–8.4 × 1–2.4 mm, without anthers, second whorl with anthers;
anthers straight after dehiscence, epidermis smooth;
styles 3.5–5.4 mm.
petals golden yellow, 6.4–17(–20) × 2–5.3 mm, apex usually acute, occasionally rounded, glabrous abaxially;
stamens golden yellow, 5 outermost petaloid, filaments linear to oblanceolate, slightly clawed, 6.2–14.2(–17.5) × 1–3.9 mm, usually without, rarely with, anthers, second whorl with anthers;
anthers straight after dehiscence, epidermis smooth;
styles 6–11 mm.
cylindric, 13.6–23.5 × 5.1–7.8 mm, base tapering, not or slightly longitudinally ridged.
cup-shaped, 7.3–13.7 × 5.5–9.8 mm, base rounded, not longitudinally ridged.
coat anticlinal cell walls straight, papillae 4–17 per cell.
coat anticlinal cell walls straight, papillae 5–18 per cell.
= 22.
= 22.
Mentzelia albescens
Mentzelia pterosperma
Phylogenetic analyses (J. J. Schenk and L. Hufford 2011) recovered representative populations of Mentzelia albescens from Texas and South America in a monophyletic group. Phylogenetic placement of these populations among lineages in sect. Bartonia, as well as a lack of morphological differentiation among North American and South American populations, suggests a recent dispersal to South America. In the flora area, this species is native to central and western Texas, and introduced in Kansas, Missouri, and Oklahoma.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Mentzelia pterosperma occurs in the Colorado Plateau and Mojave Desert. Mojave Desert populations occur from eastern San Bernardino and southeastern Inyo counties, California, through Clark County, Nevada. Colorado Plateau populations are common in northern Arizona and extend northward to Utah and western Colorado. Populations in Utah occur in habitats composed of gravelly soils that are sandy or gypsum-rich clay, whereas Arizona and Nevada populations occur primarily on clayey soils, which sometimes contain gypsum.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
KS Wildflowers
MO Plants
WildflowerSearch
iNaturalist
USDA Plants Database
CA
SW CO Wildflowers
