Mentzelia multicaulis

(Osterhout) J. Darlington

Ann. Missouri Bot. Gard. 21: 156. 1934.

Common names: Multiple-branched or manystem blazingstar
IllustratedEndemic
Basionym: Touterea multicaulis Osterhout Bull. Torrey Bot. Club 30: 236. 1903
Treatment appears in FNA Volume 12. Treatment on page 511. Mentioned on page 500.

Plants perennial, bushlike, with subterranean caudices or sometimes rhizomes. Stems multiple, erect or decumbent, zigzag or straight; branches distal or along entire stem, distal longest or all ± equal, antrorse, straight to upcurved; hairy. Leaves: blade 20–49(–57) × 4.2–19 mm, widest intersinus distance 1.1–5.3 mm; proximal oblanceolate to elliptic, margins pinnate to pinnatisect, lobes 4–10, slightly antrorse, 0.7–7.6 mm; distal linear to lanceolate, base not clasping, margins entire or pinnate, lobes 0–10, slightly antrorse, 1.9–7.8 mm; abaxial surface with simple grappling-hook trichomes, adaxial surface with grappling-hook and needlelike trichomes. Bracts: margins entire. Flowers: petals golden yellow, 10.6–17.9 × 5.1–9 mm, apex obtuse, glabrous abaxially; stamens golden yellow, 5 outermost petaloid, filaments oblanceolate, slightly clawed, 6.5–10.5 × 2–4.5 mm, with anthers, second whorl with anthers; anthers twisted or straight after dehiscence, epidermis smooth; styles 6–11.5 mm. Capsules cup-shaped to cylindric, 6–13.6 × 3.4–6 mm, base tapering to rounded, not longitudinally ridged. Seeds: coat anticlinal cell walls straight, papillae 4–9 per cell. 2n = 22.


Phenology: Flowering Jun–Aug.
Habitat: Sparsely vegetated steep slopes, drainage gullies, roadcuts.
Elevation: 2000–2500 m.

Discussion

Mentzelia multicaulis is known to occur in Eagle, Grand, and Summit counties.

Selected References

None.

Lower Taxa

None.
... more about "Mentzelia multicaulis"
John J. Schenk +  and Larry Hufford +
(Osterhout) J. Darlington +
Touterea multicaulis +
Multiple-branched or manystem blazingstar +
2000–2500 m. +
Sparsely vegetated steep slopes, drainage gullies, roadcuts. +
Flowering Jun–Aug. +
Ann. Missouri Bot. Gard. +
Illustrated +  and Endemic +
Mentzelia multicaulis +
Mentzelia sect. Bartonia +
species +