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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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. bolanderi (Hegelm.) Fassett

Fruit 0.8–1.4 mm diam
Ecology: Habitats and elevations of sp.
Bioregional distribution: California Floristic Province, Modoc Plateau
Distribution outside California: to British Columbia
Synonyms: subsp. b. (Hegelm.) Calder & Roy L. Taylor
More common in CA than var. h.

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bioregional map for CALLITRICHE%20heterophylla%20var.%20bolanderi being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Callitriche heterophylla var. bolanderi
Retrieve dichotomous key for Callitriche
Overlay Consortium of California Herbaria specimen data by county on this map
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