Global Compendium of Weeds
Crassula helmsii (Crassulaceae)
Presented here is summary information about the species Crassula helmsii from the Global Compendium of Weeds, and citations of references to this species as a weed. Definitions of terms are available in the GCW introduction . For further information--or to report corrections or concerns--contact firstname.lastname@example.org.
Synonyms/other Latin names: [ see GRIN ]
Status(es) (compiled for below "Data sources"): cultivation escape, environmental weed, naturalised, noxious weed, weed [for definitions, see the GCW introduction .]
Origin (native to where): [no info]
Lesley Henderson & Carina J. Cilliers (2002) Invasive Aquatic Plants. A guide to the identification of the most important and potentially dangerous invasive aquatic and wetland plants in South Africa. Plant Protection Research Institute Handbook No. 16. Agricultural Research Council, South Africa. SPECIES NOT WANTED IN SOUTHERN AFRICA. The list is based on prohibited and noxious plant lists for South Africa and other countries which share many invasive species with southern Africa, namely Australia, New Zealand, United States of America (federal list), Florida (State list) and California (State list) see references after the list. The list includes species not yet in southern Africa and those which may be present but are scarce and their cultivation should be discouraged. Algae are excluded.
Check-list of the Flowering Plants and Ferns of Cornwall and the Isles of Scilly - 1994 C.N. French and R.J. Murphy. University of Exeter (naturalised)
Clement, E.J. and Foster, M.C. (1994) Alien plants of the British Isles. Botanical Society of the British Isles, London. (environmental weed)
Cronk, Q.C.B and Fuller, J.L. (1995). Plant Invaders, The threat to natural ecosystems. Chapman and Hall United Kingdom (environmental weed)
Dr. David Patterson Weed Specialist North Carolina Department of Agriculture and Consumer Services Plant Protection Section email: David_Patterson@mail.agr.state.nc.us (noxious weed)
Fowler, A.L., Caton, B.P. Fieselmann, D., Fowler, G. and Parker, C. (2003). Creation of a Prioritization Model to Identify Weeds of Global Significance. Weed Science Society of America, Jacksonville, Florida. [The following lists indicate (Table 1) the 15 species (not in cultivation in USA) selected under Phase I and (Table 2) the further 25 highest-ranking species selected under Phase II. Full fact sheets of the new 25 species are appended (Appendix 1). Appendix 2 includes the further 126 species not in cultivation which have been fully scored. Corresponding lists of species already in cultivation in USA appear as Tables 3 and 4. The latter table includes all those species, in cultivation, which have been at least partially scored (though this process is far from complete)]
Germplasm Resources Information Network G.R.I.N. GRIN (weed)
Hill, M., Baker, R., Broad, G., Chandler, P.J., Copp, G.H., Ellis, J., Jones, D., Hoyland, C., Laing, I., Longshaw, M., Moore, N., Parrott, D., Pearman, D., Preston, C., Smith, R.M. and Waters, R.(2005). Audit of non-native species in England. English Nature Research Reports N° 662, English Nature. (cultivation escape, naturalised)
Holm, L. G., Pancho, J. V., Herberger, J. P. and Plucknett, D. L. (1979). A Geographical Atlas of World Weeds. John Wiley and Sons NewYork, USA (weed)
Inger Wallentinus (19??). Introduced Marine Algae and Vascular Plants in European Aquatic Enviroments. Department of Marine Botany, Göteborg University, Göteborg, Sweden. Appendix 1. Introduced vascular plants in aquatic environments in the different European areas, incuding also occasional species. (naturalised)
List of invasive species. The table hereafter lists invasive alien species which were recorded in Belgium. Those species are either in strong geographical expansion or are known to produce detrimental impacts on environment sensu lato. This list is under the responsiblity of members of the Belgian Forum on Invasive Species. It is not exhaustive and will be progressively completed. Species profiles including description, habitat preferences, detrimental impact and management information are currently in development. (naturalised)
NEOFLORA: The 30 most important invasive kinds (plants) in Germany. For comprehensive background information consider the book. "Biological invasions: Neophyten and Neozoen in Central Europe" by Ingo Kowarik. (environmental weed)
Noxious weeds in the US and Canada. This web site provides a searchable database of the noxious weed lists for all U.S. states and six southern provinces of Canada. The database can be searched by plant name, state name, or by clicking on a map. This portion of the INVADERS web site is supported by the USDA Agricultural Research Service. Principal investigators: Dr. Kerri Skinner, University of Nebraska - Kearny, NE Dr. Lincoln Smith, USDA-ARS Western Region Research Center, Albany, CA Peter Rice, University of Montana - Missoula, MT (noxious weed)
PLANT INVADERS IN SPAIN [CHECK-LIST] `The Unwanted Citizens' Dana, E.D., Sanz-Elorza, M. & Sobrino, E. (1) Sanz-Elorza, M., Dana, E.D. & Sobrino, E. 2001. Aproximaci en al listado de plantas al_ctonas invasoras reales y potenciales en Espana. Lazaroa 22: 121-131. [English abstract] (2) Dana, E.D. Cerrillo, M.I., Sanz-Elorza, M., Sobrino, E. & Mota, J.F. 2001. Contribucion al conocimiento de las xen_fitas en Espana: cat_logo provisional de la flora al_ctona de Almer_a. Acta Botanica Malacitana 26 264-276. [English abstract] We have included also some unpublished recent data within this list. The species have been arranged first by their invasive character (from higher to lower). Within the most aggressive, species have been presented by their morphology (herbaceous, woody, and so on). Within species are alphabetically listed. Consideration of `Invasiveness' follows the recent proposal by Richardson, D., Pysek, P., Rejmanek, M., Barbour, M.G., Panetta, F.D. & West, C.J. 2000. Naturalization and invasion of alien plants: concepts and definitions. Diversity and Distributions 6: 93-107. (naturalised)
Preston, C.D., Pearman, D.A. and Dines, T.D. (2002) New Atlas of the British & Irish Flora. An Atlas of the Vascular Plants of Britain, Ireland, the Isle of Man and the Channel Islands. Oxford University Press. (naturalised)
Richardson, F.J., Richardson, R.G. and Shepherd, R.C.H. (2006). Weeds of the South-East. An identification guide for Australia. R.G. & F.J. Richardson. Meredith, Victoria. ISBN 0958743932, 438 pages. (weed)
Weber, E. (2003). Invasive Plant Species of the World. A Reference Guide to Environmental Weeds. CABI Publishing, UK. [dist data refers to regions where plant is an environmental weed] (environmental weed)
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GCW species list
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This page was created on 13 September 2007 by PT, and was last updated on
04 October 2007
by PT based on data from Rod Randall's Global Compendium of Weeds database dated 24 January 2007.