Wolffia columbiana H.Karst.

Columbian watermeal (en)

Species

Angiosperms > Alismatales > Araceae > Wolffia

Characteristics

Thallus light green and translucent, broadly ellipsoid to globose, asymmetrical, mostly 0.8–1.4 × 0.6–1.2 mm, 1–1.3 times as long as wide, not punctate, floating low in the water, only a small circular portion of the upper surface in contact with the air; upper surface slightly roughened, sometimes to form ca 3 obscure papillae; stomates 3–5; 2n=30, 40, 50, 70. Quiet water; Mass. and N.H. to s. Ont. and Minn., s. to S. Amer.; often forming more than one layer, some wholly submersed.
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Fronds nearly globular, 0.5--1.4 mm (x 0.4--1.2 mm), 1--1.3 times as long as wide, 1--1.3 times as deep as wide, rounded at apex, papilla absent; upper surface transparently green, with 1--10(--30) stomates; pigment cells absent in vegetative tissue. 2n = 30 (H, U), 40 (U), 42 (D), 500 (U), 70 (70), 80 (U).
Life form perennial
Growth form herb
Growth support aquatic
Foliage retention evergreen
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Hardiness (USDA) 4-11

Usage

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Cultivation

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Images

Wolffia columbiana unspecified picture

Distribution

Wolffia columbiana world distribution map, present in Åland Islands, Bolivia (Plurinational State of), Brazil, Canada, Colombia, Germany, Ecuador, Micronesia (Federated States of), Georgia, Guatemala, Honduras, Italy, Malaysia, Nicaragua, Netherlands, Paraguay, Uruguay, United States of America, and Venezuela (Bolivarian Republic of)

Conservation status

Wolffia columbiana threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:526266-1
WFO ID wfo-0000334454
COL ID 5C2XH
BDTFX ID 167342
INPN ID 999530
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Grantia columbiana Bruniera columbiana Wolffia columbiana