Jepson Flora Project: Jepson Interchange    

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

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



C. Thomas Philbrick

Annual, in water or on wet ground, monoecious
Stem slender, generally ascending under water, floating on surface, or prostrate on ground, generally much-branched
Leaves simple, generally opposite, 4-ranked, linear-lanceolate to spoon-shaped, entire; stipules 0
Inflorescence: flowers 1–3 per leaf axil, the group subtended by generally 2 whitish, inflated bracts
Flowers minute, unisexual; perianth 0
Staminate flower: stamen generally 1, filament elongate
Pistillate flower: ovary superior, ± obcordate, chambers 4, styles 2, thread-like
Fruit 0.6–1.6 mm (width generally ± = length), ± dry, ± grooved longitudinally, splitting into 4 achene-like units
Recent taxonomic note: Recently treated in expanded Plantaginaceae (= Veronicaceae sensu Olmstead et al.) that includes genera removed from Scrophulariaceae [Angiosperm Phylogeny Group 1998 Ann Missouri Bot Gard 85:531–553; Olmstead et al. 2001 Amer J Bot 88:348–361]
Horticultural information: DRN, DRY, SUN; DFCLT.



The only genus,
Species in genus: ± 40 species: tropical, temp
Etymology: (Greek: beautiful hair, from slender stems)
Reference: [Fassett 1951 Rhodora 53:137–155,161–182, 185–194,209–222; Philbrick & Jansen 1991 Syst Bot 16:478–491]
Taxonomically difficult; mature fruit and 10X magnification needed for identification.


C. heterophylla Pursh

Leaves often with floating rosette; submersed leaves linear-lanceolate; floating, emergent, or terrestrial leaves sometimes present and spoon-shaped
Inflorescence: bracts subtending flowers 2, whitish, inflated, persistent in fruit
Fruit: wing 0 or only above middle; pedicel 0–0.5 mm
Ecology: Becoming stranded at edge of pools or streams or submersed < ± 15 dm
Elevation: < 2000 m.
Bioregional distribution: California Floristic Province, Modoc Plateau
Distribution outside California: to British Columbia, e N.America
Varieties intergrade.


var. heterophylla

Fruit 0.6–0.8 mm diam
Ecology: Habitats and elevations of sp.
Bioregional distribution: Northwestern California, Great Central Valley, Central Western California, Southwestern California
Distribution outside California: to eastern N.America

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bioregional map for CALLITRICHE%20heterophylla%20var.%20heterophylla being generated

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