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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PONTEDERIACEAE

PICKEREL-WEED FAMILY

Elizabeth McClintock

Annual, perennial herb, submersed, emergent, floating, or on wet ground
Leaves simple, alternate or whorled, ± in basal rosette or not; blade linear (especially underwater) to round, sagittate or cordate or not, bases generally sheathing, veins parallel; petioles sometimes inflated or 0 (especially underwater)
Inflorescence: raceme, spike, panicle, or 1-flowered, terminal but often appearing ± axillary, subtended by sheathing bract
Flower bisexual, radial or ± bilateral; perianth lobes generally 6, in 2 series of 3, petal-like; stamens equal or not, attached to perianth tube at various levels, 3, 6, (1, 4), sometimes 3 sterile, modified; ovary superior, 1–3-chambered
Fruit: 1-seeded utricle or many-seeded, loculicidal capsule
Seeds small, longitudinally ribbed or not
Genera in family: ± 6 genera, 30 species: most pantrop, some temp. Some cultivated as orns, some weeds, especially in rice fields
Reference: [Rosatti 1987 J Arnold Arb 68:35–71]

MONOCHORIA

Perennial, submersed or emergent
Stems ± erect, connected by rhizomes
Leaf 1 at stem tip; blade ovate to narrowly lanceolate; petiole long
Inflorescence: raceme, 1 at stem tip, eventually reflexed
Flower ± radial; perianth bell-shaped to rotate, tube < 1 cm, parts 6, nearly free; stamens 6, 1 generally > others; ovary 3-chambered
Fruit: capsule
Seeds many, slightly ribbed longitudinally
Species in genus: 6 species: tropical Africa, Asia, ne Australia
Etymology: (Greek: 1 apart, from 1 stamen > others)

Introduced

M. vaginalis (Burm. f.) Kunth


Stem > 12 cm
Leaf: blade 2.5–11 cm; petiole 4–70 cm
Inflorescence > 5 cm, few-flowered
Flower generally opening under water; perianth blue, parts < 2 cm
Ecology: Uncommon. Rice fields
Elevation: > 100 m.
Bioregional distribution: Sacramento Valley
Distribution outside California: native to tropical Australia, Asia

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bioregional map for MONOCHORIA%20vaginalis 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 Monochoria vaginalis
Retrieve dichotomous key for Monochoria
Overlay Consortium of California Herbaria specimen data by county on this map
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