Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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LOASACEAE

LOASA FAMILY

Barry Prigge

Annual to shrub; hairs needle-like, stinging, or rough
Leaves alternate in CA, generally ± pinnately lobed; stipules 0
Inflorescence various
Flower bisexual, radial; sepals generally 5, generally persistent in fruit; petals generally 5, free or fused to each other or to filament tube; stamens 5–many, filaments thread-like to flat, sometimes fused at base or in clusters; petal-like staminodes sometimes present; pistil 1, ovary inferior, chamber generally 1, placentas generally 3, parietal, style 1
Fruit: generally capsule (utricle)
Seeds 1–many
Genera in family: 15 genera, ± 200 species: especially Am (Africa, Pacific)
Reference: [Ernst & Thompson 1963 J Arnold Arbor 44:138–142]

MENTZELIA

BLAZING STAR

Annual to shrub; hairs generally barbed-rough (smooth)
Leaf linear to ovate, generally ± lobed; basal in rosettes, generally petioled; cauline generally sessile, ± reduced upward
Inflorescence: generally cyme (or flower 1); bract generally 1 per flower, generally green
Flower: sepals lanceolate to deltate, generally persistent; petals 5, free, generally yellow; stamens generally many, ± free, generally unequal, inner filaments generally thread-like; staminodes 0 or 5–many, outer often petal-like; ovary generally cylindric, placentas generally 3, style thread-like, stigma 3-furrowed or -lobed
Fruit generally tapered to base, sometimes curved
Seeds generally many, grain- to prism-like (triangular in X -section), angled, or lenticular and winged (important to identification)
Species in genus: ± 50 species: w US, ± tropical Am
Reference: [Darlington 1934 Ann Missouri Bot Garden 21:103–226]

Native

M. pterosperma Eastw.

Perennial (may flower first year) 6–42 cm
Leaves 1–13 cm; basal entire to short-toothed; cauline toothed (or lobed near base)
Inflorescence: bract narrowly lanceolate, entire
Flower: sepals 6–10 mm; petals 9–24 mm, tips acute; staminodes 5, petal-like, slightly < petals; stamens 4–15 mm, outer filaments 1–3 mm wide; style 6–17 mm
Fruit 8–14 mm, 6–10 mm wide, cup- to barrel-shaped
Seed ± 3–4 mm, elliptic in outline, lenticular, winged, fine-pebbled
Chromosomes: n=11
Ecology: Gypsum clay soils
Elevation: 1100 m.
Bioregional distribution: e Desert Mountains (Clark Mtns)
Distribution outside California: to Colorado, nw Arizona

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bioregional map for MENTZELIA%20pterosperma being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Mentzelia pterosperma
Retrieve dichotomous key for Mentzelia
Overlay Consortium of California Herbaria specimen data by county on this map
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