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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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]


Annual, perennial herb, glabrous
Stem ascending to erect, angled
Leaves opposite, 4-ranked (rarely whorled)
Inflorescence: spike; flower 1 per axil, subtended by leaf-like bract
Flower radial; hypanthium bell-shaped; sepals generally 4, appendages 4 or 0; petals 4, tiny, < sepals; stamens generally 4, ± included
Fruit oblong to ± spheric, dehiscent by 2–4 valves
Seeds many, < 1 mm
Species in genus: ± 45 species: temp, tropical
Etymology: (Latin: wheel-like)
Reference: [Cook 1979 Boissiera 29:7–156]


R. ramosior (L.) Koehne

Stem prostrate to erect, 1–4 dm, generally branched; upper branches ± 4-angled
Leaf 1–5 cm, linear to oblanceolate
Inflorescence: flower 1 per axil
Flower: hypanthium 2–5 mm; sepals broadly deltate; appendages awl-like, 2 X sepals; petals white to pink
Fruit ovoid to ± spheric, generally 4-valved
Ecology: Irrigated fields, lake and pond margins, streams
Elevation: < 1900 m.
Bioregional distribution: Inner North Coast Ranges, n&c Sierra Nevada, Great Central Valley
Distribution outside California: to Washington, e US, S.America

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bioregional map for ROTALA%20ramosior 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 Rotala ramosior
Retrieve dichotomous key for Rotala
Overlay Consortium of California Herbaria specimen data by county on this map
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