Mentzelia torreyi

A. Gray

Proc. Amer. Acad. Arts 10: 72. 1874

Common names: Torrey’s blazingstar
IllustratedEndemic
Treatment appears in FNA Volume 12. Treatment on page 530.

Plants with ground-level or subterranean caudices. Stems 5–25 cm. Leaves: petiole absent; blade ovate or obovate, to 45 × 35 mm, intersinus distance 2–4 mm. Pedicels 0(–1.5) mm. Flowers: petals yellow to orange, narrowly spatulate to obovate, 4.5–17 × 1.2–5 mm, apex rounded; stamens 25–45, 7–21 mm; styles 7–18 mm. Capsules 3–7 × 3–4.5 mm. Seeds 3–9 per capsule, edges prominently to inconspicuously ridged. 2n = 28.

Discussion

Varieties 2 (2 in flora).

In the phylogenetic study by L. Hufford et al. (2003), Mentzelia torreyi was recovered as the sister to the rest of the genus.

Selected References

None.

Key

1 Petals 8–17 mm, yellow; longest stamens to 1 mm longer than petals. Mentzelia torreyi var. torreyi
1 Petals 4.5–8 mm, orangish yellow, orange, or burnt orange; longest stamens usually much more than 1 mm longer than petals. Mentzelia torreyi var. acerosa