Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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PORTULACACEAE

PURSLANE FAMILY

Annual or perennial herb, generally fleshy
Stems generally glabrous
Leaves simple, alternate or opposite, sometimes stipuled
Inflorescence various
Flower bisexual, radial; sepals generally 2(–8), free or fused at base; petals 3–18, free or ± fused; stamens 1–many, free or inserted on corolla; ovary superior or partly inferior, chamber 1, placenta free-central or basal; styles 2–8, generally fused at base
Fruit: capsule, circumscissile or 2–3-valved
Seeds 1–many, generally black, generally shiny
Genera in family: ± 20 genera, ± 400 species: generally temp Am, Australia, s Africa; some cultivated (Lewisia, Portulaca, Calandrinia )
Reference: [Bogle 1969 J Arnold Arbor 50:566–598]
Family description and key to genera by Dieter H. Wilken & Walter A. Kelley.

MONTIA

Kenton L. Chambers

Annual or perennial herb, glabrous, ± fleshy, sometimes ± aquatic, sometimes matted
Leaves: cauline > 2, alternate or opposite, entire
Inflorescence: raceme, 1-sided; lowest flower generally bracted; pedicels recurved, erect in fruit
Flower: petals (3–)5, equal or 2 larger; stamens (3–)5, filaments fused to corolla-base; ovary chamber 1, placentas basal, style 1, stigmas 3
Fruit: capsule; valves 3, margins rolling inward and forcibly expelling seeds
Seeds 1–3, generally black, smooth to tubercled, fleshy-appendaged or not
Species in genus: 12 species: Am, Siberia, Australia
Etymology: (Giuseppe Monti, Italian botanist, 1682–1760)
Reference: [McNeill 1975 Can J Bot 53:789–809]
Sometimes divided into 9 genera.

Native

M. dichotoma (Nutt.) Howell

Annual 2–9 cm, erect, often appearing tufted
Leaves alternate, 5–40 mm, linear
Inflorescences few–many, terminal; flowers 4–16
Flower often cleistogamous; sepals 1.5–2.5 mm, widely obovate, obtuse to truncate; petals = or slightly > sepals, ± unequal, white; stamens 3
Fruit 1.4–1.8 mm
Seed 0.8–1.2 mm, ± smooth; appendage 0
Chromosomes: 2n=14
Ecology: Uncommon. Moist depressions, grassland, open woodland
Elevation: 1000–1600 m.
Bioregional distribution: Klamath Ranges, Cascade Range, Modoc Plateau
Distribution outside California: to British Columbia, Montana
Self-pollinating.

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