Crassula aquatica - (L.) Schoenl.
Water Pygmyweed
Other Common Names: water pygmyweed
Synonym(s): Tillaea aquatica L.
Taxonomic Status: Accepted
Related ITIS Name(s): Crassula aquatica (L.) Schoenl. (TSN 24099)
French Common Names: tillée aquatique
Unique Identifier: ELEMENT_GLOBAL.2.158137
Element Code: PDCRA02010
Informal Taxonomy: Plants, Vascular - Flowering Plants - Stonecrop Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Rosales Crassulaceae Crassula
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Crassula aquatica
Taxonomic Comments: FNA (vol. 8, 2009) includes Crassula saginoides in C. aquatica¿, while Kartesz (1994) here treats them as distinct.
Conservation Status
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NatureServe Status

Global Status: G5
Global Status Last Reviewed: 24Jan2012
Global Status Last Changed: 10Apr1985
Rounded Global Status: G5 - Secure
Reasons: Easily overlooked herb with patchy, widespread distribution in North America, Europe, and eastern Asia; with tens of thousands of occurrences.
Nation: United States
National Status: NNR
Nation: Canada
National Status: N4N5 (29Sep2015)

U.S. & Canada State/Province Status
United States Alabama (SU), Alaska (S3), Arkansas (S1S3), California (SNR), Colorado (SH), Connecticut (S1), Delaware (SX), Georgia (SU), Idaho (S1), Louisiana (SNR), Maine (S2S3), Maryland (SH), Massachusetts (S2), Minnesota (S2), Montana (SU), New Hampshire (S1), New York (S1), Oklahoma (S1), Oregon (SNR), Pennsylvania (SX), Rhode Island (SNR), Texas (SNR), Utah (S1), Vermont (S1), Washington (S3)
Canada British Columbia (S4), New Brunswick (S3), Newfoundland Island (S1), Northwest Territories (SNR), Nova Scotia (S2), Ontario (S2), Prince Edward Island (S1), Quebec (S3), Saskatchewan (S1), Yukon Territory (S1)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Spotty distribution throughout the Northern Hemisphere.

Population Size Comments: Common in appropriate habitat, often overlooked.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Spotty distribution throughout the Northern Hemisphere.

U.S. States and Canadian Provinces
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States AK, AL, AR, CA, CO, CT, DEextirpated, GA, ID, LA, MA, MD, ME, MN, MT, NH, NY, OK, OR, PAextirpated, RI, TX, UT, VT, WA
Canada BC, NB, NF, NS, NT, ON, PE, QC, SK, YT

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
AK Wrangell-Petersburg (CA) (02280)
CT Middlesex (09007), New Haven (09009)*, New London (09011)
MA Bristol (25005)*, Dukes (25007), Essex (25009)*, Franklin (25011)*, Hampshire (25015), Nantucket (25019), Plymouth (25023)
MD Charles (24017)*, Wicomico (24045)*
ME Cumberland (23005)*, Kennebec (23011), Lincoln (23015), Penobscot (23019), Sagadahoc (23023), York (23031)
MN Rock (27133), St. Louis (27137)
NH Cheshire (33005)*, Strafford (33017)
NY Rockland (36087), Suffolk (36103), Ulster (36111)*
PA Bucks (42017)*
VT Windham (50025)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
01 Lower Penobscot (01020005)+, Lower Kennebec (01030003)+, Lower Androscoggin (01040002)+, St. George-Sheepscot (01050003)+, Presumpscot (01060001)+*, Saco (01060002)+, Piscataqua-Salmon Falls (01060003)+, Black-Ottauquechee (01080106)+, West (01080107)+, Middle Connecticut (01080201)+, Lower Connecticut (01080205)+, Cape Cod (01090002)+, Narragansett (01090004)+*, Quinnipiac (01100004)+*, Housatonic (01100005)+*
02 Middle Hudson (02020006)+*, Lower Hudson (02030101)+, Southern Long Island (02030202)+, Lower Delaware (02040202)+*, Lower Potomac (02070011)+*, Eastern Lower Delmarva (02080110)+*
09 Rainy Headwaters (09030001)+
10 Lower Big Sioux (10170203)+, Rock (10170204)+
19 Mainland (19010201)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Technical Description: From CNHP Wetland Guide 2012: Plants aquatic, sometimes stranded, annual. Stems decumbent, later ± erect if stranded, reddish in age, usually branched at base, to 14 cm, (rooting at basal nodes). Leaf blades oblanceolate to linear, 2-6 mm, apex acute. Inflorescences lax; flowers 1 per node. Pedicels 0.5-20 mm. Flowers 4-merous; sepals ovate to oblong, 0.5-1.5 mm, apex obtuse to rounded; petals ovate to oblong, 1-2 mm. Follicles erect, 6-17-seeded, oblong; old follicles spreading, flat. Seeds oblong-ellipsoid, (0.3-)0.4-0.5(-0.6) × 0.1-0.3 mm, not papillate, dull, minutely rugulose.


Diagnostic Characteristics: 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

Habitat Comments: Mudflats and shallow pools.
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
Help
Element Ecology & Life History Edition Date: 17May2001
Element Ecology & Life History Author(s): KLC

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
Help
  • Argus, G.W., K.M. Pryer, D.J. White and C.J. Keddy (eds.). 1982-1987. Atlas of the Rare Vascular Plants of Ontario.. Botany Division, National Museum of National Sciences, Ottawa.

  • Brouillet, L., D. Bouchard et F. Coursol 1996. Les plantes susceptibles d'être désignées menacées ou vulnérables et autres plantes rares de l'estuaire fluvial du Saint-Laurent entre Grondines et Saint-Jean-Port-Joli. Rapport préliminaire préparé pour le g

  • Cody, W.J. 1954. A history of Tillaea aquatica (Crassulaceae) in Canada and Alaska. Rhodora 56: 96-101.

  • Coffin, B., and L. Pfannmuller, editors. 1988. Minnesota's endangered flora and fauna. University of Minnesota Press, Minneapolis, Minnesota. 473 pp.

  • Crow, Garrett E. and C. Barre Hellquist. 2000. Aquatic and Wetland Plants of Northeastern North America: A revised and enlarged edition of Norman C. Fassett's a Manual of Aquatic Plants. Volume One: Pteridophytes, Gymnosperms, and Angiosperms: Dicotyledons. The University of Wisconsin Press. Madison, Wisconsin. 536 Pages.

  • Fernald, M.L. 1950. Gray's manual of botany. 8th edition. D. Van Nostrand, New York. 1632 pp.

  • Foramec Inc., Dryade Ltée 1992. Complexe Nottaway-Broadback-Rupert. Les espèces vasculaires rares. Rapport présenté à Hydro-Québec, Vice-présidence Environnement. 27 p. + annexes.

  • Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. The New York Botanical Garden, Bronx, New York. 910 pp.

  • Holmgren, Noel. 1998. The Illustrated Companion to Gleason and Cronquist's Manual. Illustrations of the Vascular Plants of Northeastern United States and Adjacent Canada. The New York Botanical Garden, Bronx, New York.

  • Kartesz, J. T. 1991. Synonym names from 1991 checklist, as extracted by Larry Morse, TNC, June 1991.

  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

  • Marineau, K. et R. Vaudry. S.D. Inventaire et localisation des plantes d'intérêt, Lieu Historique National de la Grosse-Île-et-le-Mémorial-des-Irlandais. Inventaire et localisation des plantes d'intérêt, Lieu Historique National de la Grosse-Île-et-le-Mém

  • Meades, S.J. & Hay, S.G; Brouillet, L. 2000. Annotated Checklist of Vascular Plants of Newfoundland and Labrador. Memorial University Botanical Gardens, St John's NF. 237pp.

  • New York Natural Heritage Program. 2010. Biotics database. New York Natural Heritage Program. New York State Department of Environmental Conservation. Albany, NY.

  • Reschke, Carol. 1990. Ecological communities of New York State. New York Natural Heritage Program, New York State Department of Environmental Conservation. Latham, NY. 96 pp. plus xi.

  • Rhoads, Ann F. and Timothy A. Block. 2000. The Plants of Pennsylvania, an Illustrated Manual. University of Pennsylvania Press, Philadelphia, PA.

  • Weldy, T. and D. Werier. 2010. New York flora atlas. [S.M. Landry, K.N. Campbell, and L.D. Mabe (original application development), Florida Center for Community Design and Research http://www.fccdr.usf.edu/. University of South Florida http://www.usf.edu/]. New York Flora Association http://wwws.nyflora.org/, Albany, New York

  • Weldy, Troy W. and David Werier. 2005. New York Flora Atlas. [S.M. Landry, K.N. Campbell, and L.D. Mabe (original application development), Florida Center for Community Design and Research. University of South Florida]. New York Flora Association, Albany, NY. Available on the web at (http://atlas.nyflora.org/).

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