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FNA | Family List | FNA Vol. 12 | Loasaceae

18. Mentzelia tiehmii N. H. Holmgren & P. K. Holmgren, Syst. Bot. 27: 748, fig. 1. 2002.
[C E]

Jerry’s blazingstar Jerry’s blazingstar

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 cup-shaped, 4–6.6 × 4–7.4 mm, base rounded, not longitudinally ridged. Seeds: coat anticlinal cell walls straight, papillae 15–46 per cell.

Flowering Jun–Aug. White, sparsely vegetated clay knolls rich in gypsum; of conservation concern; 1500–1600 m; Nev.

Mentzelia tiehmii occurs in Lincoln and Nye counties.


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