Mentzelia integra
Mentzelia lagarosa
virgin blazingstar
slender-lobed blazingstar
solitary, erect, straight;
branches distal or along entire stem, distal or proximal longest, antrorse, straight, proximal not decumbent; hairy or glabrescent.
solitary, erect, straight;
branches distal, distal longest, antrorse, straight; hairy.
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.
blade 11.3–103 × 4.8–20.1 mm, widest intersinus distance 1.2–5.7 mm;
proximal oblanceolate to elliptic, margins pinnate to pinnatisect, lobes 8–20, slightly antrorse or perpendicular to leaf axis, 1.4–8.2 mm;
distal elliptic to lanceolate, base not clasping, margins pinnatisect, lobes 6–16, slightly antrorse or perpendicular to leaf axis, 1.6–7.5 mm;
abaxial surface with simple grappling-hook, complex grappling-hook, and occasionally needlelike trichomes, adaxial surface with simple grappling-hook and needlelike trichomes.
margins entire.
margins usually entire, sometimes toothed or pinnate.
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.
petals golden yellow, 8.3–13 × 2.2–5.4 mm, apex acute or rounded, glabrous abaxially;
stamens golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 6.5–10.7 × 1.7–4.3 mm, without anthers, second whorl with anthers;
anthers straight after dehiscence, epidermis smooth;
styles 6.1–10.2 mm.
cup-shaped, 6.2–11.4(–13) × 6–8.4 mm, base rounded, not longitudinally ridged.
cylindric, 12.1–21.2 × 4.9–7.6 mm, base tapering or rounded, not longitudinally ridged.
coat anticlinal cell walls wavy, papillae 5–13 per cell.
coat anticlinal cell walls wavy, papillae 29–31 per cell.
= 20.
= 22.
Mentzelia integra
Mentzelia lagarosa
Mentzelia integra is found in northwestern Arizona, southeastern Nevada, and southwestern Utah.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Mentzelia lagarosa is allopatric with two of the three species most similar to it, namely M. holmgreniorum and M. filifolia, and nearly allopatric with the third, M. laciniata. Where the ranges of M. lagarosa and M. laciniata overlap in western Colorado, they can be distinguished by petal length [8.3–13 mm in M. lagarosa versus 14–23.8(–26) mm in M. laciniata], outermost stamen length (6.5–10.7 mm in M. lagarosa versus 12–20 mm in M. laciniata), and number of seed coat cell papillae (29–31 per cell in M. lagarosa versus 5–14 per cell in M. laciniata); in addition, M. lagarosa bears both simple grappling-hook and needlelike trichomes on its adaxial leaf blade surfaces, whereas leaf blades of M. laciniata bear only needlelike trichomes adaxially. In the Intermountain Flora, N. H. Holmgren et al. (2005) treated M. lagarosa as a synonym of M. multiflora, but J. J. Schenk and L. Hufford (2011) showed not only that M. lagarosa is distinct from M. multiflora, but also that the latter does not occur in the intermountain region.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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WildflowerSearch
iNaturalist
USDA Plants Database
