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Overview

Distribution

National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Global Range: Nativity unclear in the U.S. Occurs in California (two counties), Nevada (two counties), Alaska, Massachusetts, Oregon, Washington, and Wyoming (Kartesz 2003 draft). All of Kartesz' state level reports, except California, are based on Kew Bulletin (1984), and this taxon does not show up in any regional floras. This throws suspicion on the nativity of the taxon in the U.S. Possibly just a poorly known taxa and overlooked.

Also occurs in Canada (Nova Scotia) (Kartesz 2003 draft), Mexico, and northern Eurasia (Hickman 1993).

Hickman (1993) notes that Crassula aquatica individuals from interior habitats with pedicels elongated in front have been called C. saginoides (Maxim.) Bywater & Wick. In California, occurs in salt marshes, vernal pools, and ponds (Hickman 1993).

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National Distribution

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Global Range: Spotty distribution throughout the Northern Hemisphere.

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Physical Description

Morphology

Description

Herbs 2-6 cm tall. Roots fibrous. Stems branched from base, erect or ascending. Leaf blade linear-lanceolate, 4-8 × ca. 1 mm, base connate, apex acute. Flowers axillary or rarely terminal, sessile, 4- or rarely 5-merous. Sepals ovate, ca. 0.5 mm, apex obtuse. Petals white, ovate-oblong, ca. 1 mm, apex obtuse. Stamens shorter than petals. Nectar scales spatulate-linear, ca. 1.5 × as long as carpels. Carpels ovoid-oblong. Styles short. Follicles more than 10-seeded. Seeds brown, cylindric, ca. 0.5 mm, longitudinally striate. Fl. May-Jul.
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Diagnostic Description

From CNHP Wetland Guide 2012: Main Characteristics:
·Plant is very minute spreading stems no more than 1 cm long
·Leaves opposite, entire to toothed and fleshy

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Type Information

Holotype for Tillaeastrum pringlei Rose in Britton & Rose
Catalog Number: US 304049
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Card file verified by examination of original publication
Preparation: Pressed specimen
Collector(s): C. G. Pringle
Year Collected: 1896
Locality: "Serrania de Ajusco"., Distrito Federal, Mexico, North America
  • Holotype: Rose, J. N. 1903. Bull. New York Bot. Gard. 3: 2.
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Ecology

Habitat

Comments: Mudflats and shallow pools.

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Depth range based on 6 specimens in 1 taxon.

Environmental ranges
  Depth range (m): 1 - 1
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Habitat & Distribution

Sandy areas along rivers or river banks. Heilongjiang, Nei Mongol [Japan, Korea, Mongolia, Russia; Europe, North America].
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Crassula aquatica

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Statistics of barcoding coverage: Crassula aquatica

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 2
Specimens with Barcodes: 9
Species With Barcodes: 1
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NU - Unrankable

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NatureServe Conservation Status

Rounded Global Status Rank: GU - Unrankable

Reasons: Nativity unclear in the U.S. Occurs in California (two counties), Nevada (two counties), Alaska, Massachusetts, Oregon, Washington, and Wyoming (Kartesz 2003 draft). All of Kartesz' state level reports, except California, are based on Kew Bulletin (1984), and this taxon does not show up in any regional floras. This throws suspicion on the nativity of the taxon in the U.S. Possibly just a poorly known taxa and overlooked.

Also occurs in Canada (Nova Scotia) (Kartesz 2003 draft), Mexico, and northern Eurasia (Hickman 1993).

Hickman (1993) notes that Crassula aquatica individuals from interior habitats with pedicels elongated in front have been called C. saginoides (Maxim.) Bywater & Wick. In California, occurs in salt marshes, vernal pools, and ponds (Hickman 1993).

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National NatureServe Conservation Status

Canada

Rounded National Status Rank: N4 - Apparently Secure

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

Reasons: Easily overlooked herb with patchy, widespread distribution in North America, Europe, and eastern Asia; with tens of thousands of occurrences.

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Wikipedia

Crassula aquatica

Crassula aquatica is a succulent plant known by the common names water pygmyweed and common pygmyweed. It is an annual plant of salt marshes, vernal pools, wetlands, and other fresh to brackish water bodies. It is at least partially aquatic, living in areas which are submersed much of the time. It also lives along muddy banks and in tidally-active areas of estuaries.

Description[edit]

Crassula aquatica is a small plant forming thin mats or small patches on mud and sand, and growing more erect when exposed to open air for longer periods. The flesh of the plant is greenish-yellow to bright red or purplish. The tiny fleshy pointed leaves are only a few millimeters long.

A flower grows on a short stalk from the intersection of each oppositely-arranged pair of leaves. The flower is only about two millimeters long and wide. The fruit is a minute follicle containing several seeds. This plant is widespread across North America and Eurasia.

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