| TREATMENT FROM THE JEPSON MANUAL (1993) |
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©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora. |
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY |
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]
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 |
Annual, 4–48 cm, erect
Leaf < 13 cm, entire or base 2-lobed
Inflorescence: bract (ob)ovate, 2–6-toothed below middle, base whitish
Flower: sepals 1–4 mm; petals 2–7 mm, base sometimes with orange spot; stamens 2–7 mm; style 1.5–3 mm
Fruit 6–20 mm, 2–3 mm wide, sometimes cylindric
Seed 1–1.5 mm, ± 1 mm wide, grain-like, rough; angles sharp
Chromosomes: n=18
Ecology: Open slopes, flats, sagebrush scrub, coniferous forest
Elevation: 1200–2600 m.
Bioregional distribution: Cascade Range, Sierra Nevada, Western Transverse Ranges, San Jacinto Mountains, n East of Sierra Nevada, White and Inyo Mountains, n Desert Mountains
Distribution outside California: to Oregon, Colorado, Texas, n Mexico
Intermediate to M. congesta , M. veatchiana.