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FNA | Family List | FNA Vol. 12 | Loasaceae

16. Mentzelia springeri (Standley) Tidestrom in I. Tidestrom and M. T. Kittell, Fl. Ariz. New Mex. 288. 1941.

Springer’s or Santa Fe blazingstar Springer’s or Santa Fe blazingstar

Nuttallia springeri Standley, Proc. Biol. Soc. Wash. 26: 115. 1913

Plants perennial, bushlike, with subterranean caudices. Stems multiple, erect or decumbent, straight; branches along entire stem, distal longest or all ± equal, antrorse, upcurved; hairy. Leaves: blade 18–56 × 1.9–5.9 mm, widest intersinus distance 0.7–2.1 mm; proximal oblanceolate to elliptic, margins dentate to pinnate, teeth or lobes 6–12, perpendicular to leaf axis, 0.8–2.1 mm; distal elliptic, lanceolate, or linear, base not clasping, margins usually dentate, rarely entire, teeth (0–)4–6, perpendicular to leaf axis, 0.4–2.1 mm; abaxial surface with simple grappling-hook, complex grappling-hook, and needlelike trichomes, adaxial surface with simple grappling-hook, needlelike, and rarely complex grappling-hook trichomes. Bracts: margins entire. Flowers: petals golden yellow, 8.7–14.2 × 3.1–4.7 mm, apex rounded, glabrous abaxially; stamens golden yellow, 5 outermost petaloid, filaments narrowly spatulate, slightly clawed, 7–13.1 × 2–3.3 mm, without anthers, second whorl with anthers; anthers straight after dehiscence, epidermis smooth; styles 6.2–8.3 mm. Capsules cup-shaped to cylindric, 5.9–10.3 × 3.8–4.8 mm, base rounded to occasionally tapering, not longitudinally ridged. Seeds: coat anticlinal cell walls wavy, papillae 24–27 per cell. 2n = 22.

Flowering Mar–Aug. Sparsely vegetated, steep talus and pumice slopes; 1600–2200 m; N.Mex.

Mentzelia springeri is known only from Los Alamos and Sandoval counties.


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