Mentzelia tiehmii

Plants perennial, bushlike, with subterranean caudices. Stems multiple, erect, straight; branches along entire stem, all ± equal, antrorse, upcurved; hairy. Leaves: blade 19–47.5 × 5.8–9.1 mm, widest intersinus distance 4.6–7.1 mm; proximal oblanceolate to elliptic, margins dentate, teeth 6–20, perpendicular to leaf axis, 0.5–1.9 mm; distal lanceolate, deltate, or cordate, base clasping, margins entire or dentate, teeth 0–6, perpendicular to leaf axis, 0.4–1.4 mm; abaxial surface with complex grappling-hook trichomes, adaxial surface with complex grappling-hook and needlelike trichomes, both surfaces green, moderately hairy. Bracts: margins entire. Flowers: petals golden yellow, 7.7–10.8 × 1.8–4.8 mm, apex rounded, glabrous abaxially; stamens golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 7–7.3 × 1.2–2 mm, with anthers, second whorl with anthers; anthers twisted after dehiscence, epidermis smooth; styles 5.8–8 mm. Capsules cupshaped, 4–6.6 × 4–7.4 mm, base rounded, not longitudinally ridged. Seeds: coat anticlinal cell-walls straight, papillae 15–46 per cell.

Phenology: Flowering Jun–Aug.
Habitat: White, sparsely vegetated clay knolls rich in gypsum.
Elevation: 1500–1600 m.

Nev.

Discussion

Mentzelia tiehmii occurs in Lincoln and Nye counties.

Selected References

None.

Lower Taxa