Jepson Flora Project: Jepson Interchange    

 
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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

LYTHRACEAE

LOOSESTRIFE FAMILY

Elizabeth McClintock

Annual, perennial herb, shrubs, trees
Stem angled or cylindric
Leaves simple, entire, generally opposite, sometimes alternate or whorled
Inflorescence: raceme, spike, or panicle, terminal, or axillary clusters with 1–several flowers
Flower bisexual, generally radial; hypanthium cylindric to bell-shaped, generally membranous, persistent in fruit; sepals 4–6, generally persistent, appendages 3–5 or 0, alternate sepals; petals, stamens inserted on inner hypanthium; petals 4–6 or 0, alternate sepals, deciduous; stamens generally = or 2 X petals, included or exserted; ovary superior, chambers 2–6, style generally slender, stigma head-like
Fruit: capsule, opening by valves from top, splitting sometimes irregular or 0
Seeds 3–many
Genera in family: ± 25 genera, 450 species: temp, tropical, generally in wet habitats. Some ornamental or cultivated for medicine, dyes
Reference: [Graham 1964 J Arnold Arbor 45:235–250]

AMMANNIA

Annual
Stem prostrate to erect, glabrous
Leaves opposite, 4-ranked, sessile, linear to oblanceolate, generally with basal ear-like lobes
Inflorescence: cluster, axillary; flowers 3–10; bractlets 2, inconspicuous
Flower radial; hypanthium bell- to urn-shaped, ± spheric in fruit; sepals 4, appendages < or ± = sepals, thick, horn-like; petals (0)4; stamens 4(8), included or exserted
Fruit ± spheric, irregularly dehiscent
Seeds many, ± 1 mm
Species in genus: ± 25 species: temp, tropical
Etymology: (Paul Ammann, Germany, 1634–1691)
Reference: [Howell 1985 Wasmann J Biol 43:72–74]

Native

A. robusta Heer & Regel


Stem decumbent to erect, 1–10 dm, solitary or branched
Leaf 1.5–8 cm, 5–15 mm wide, generally linear-lanceolate
Inflorescence compact; flowers 1–3(5), sessile
Flower: hypanthium urn-shaped, often 4-ridged; appendages ± = sepals in fruit; petals 3–4(8) mm, obovate, pale lavender; stamens 4(5–12), exserted in flower, anthers pale yellow
Fruit 4–6 mm diam
Chromosomes: n=17
Ecology: Wet places, drying pond and ditch margins
Elevation: < 500 m.
Bioregional distribution: North Coast Ranges, s Sierra Nevada Foothills, Great Central Valley, Central Western California, South Coast, s Channel Islands (Santa Catalina Island), Sonoran Desert
Distribution outside California: to c US, Mexico
Flowering time: Jun–Aug
Synonyms: A. coccinea Rottb. misapplied

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