Mentzelia multicaulis
Mentzelia lindheimeri
manystem blazingstar, multiple-branch blazingstar
Lindheimer's blazingstar, Lindheimer's stickleaf, Texas stickleaf
multiple, erect or decumbent, zigzag or straight;
branches distal or along entire stem, distal longest or all ± equal, antrorse, straight to upcurved; hairy.
erect to decumbent or clambering, to 50 cm.
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.
petiole to 35 mm;
blade usually hastate to ovate, sometimes smallest distal elliptic, basally lobed or unlobed, to 12 × 7.5 cm, base truncate to obtusely cuneate, margins serrate, dentate, or crenulate, apex acute.
margins entire.
(fruiting) 1–5 × less than 1 mm.
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.
petals yellow to orange, 6.5–17 × 4–9.5 mm, apex cuspidate, hairy on apex and abaxially near apex;
stamens (10–)20–45, 5–12(–20) mm, filaments monomorphic, filiform;
style 3.5–13 mm.
cup-shaped to cylindric, 6–13.6 × 3.4–6 mm, base tapering to rounded, not longitudinally ridged.
usually clavate to funnelform, sometimes slightly ovoid, 8–18 × 3.3–4.5 mm, base rounded or cuneate, capsule and pedicel well-differentiated.
coat anticlinal cell walls straight, papillae 4–9 per cell.
(4–)5–10 per capsule, pyriform, without transverse folds.
= 22.
= 20.
Mentzelia multicaulis
Mentzelia lindheimeri
Mentzelia multicaulis is known to occur in Eagle, Grand, and Summit counties.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
As with most species of sect. Mentzelia first described by Urban and Gilg, the delimitation of M. lindheimeri has not been well understood. Phylogenetic results indicate that populations consistent with the types of M. lindheimeri and M. texana are part of a clade restricted to Gulf coastal areas from Florida to northeastern Mexico that also includes M. floridana and M. gracilis. Populations consistent with the M. lindheimeri and M. texana types overlap, and we treat M. texana as a synonym of the former. Mentzelia lindheimeri as treated here is restricted mostly to subtropical southeastern Texas. It is rare in trans-Pecos Texas, although we identified populations of M. lindheimeri in the Davis Mountains. Texas collections annotated as M. incisa Urban & Gilg by Thompson and Zavortink, which served as the basis for Texas reports of that species (for example, D. S. Correll and M. C. Johnston 1970; B. L. Turner et al. 2003) are treated here as M. lindheimeri.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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