Pilea nummulariifolia (creeping Charlie)
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- Margery Baker
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1 Australia/New Zealand Weed Risk Assessment adapted for Florida. Data used for analysis published in: Gordon, D.R., D.A. Onderdonk, A.M. Fox, R.K. Stocker, and C. Gantz. 28. Predicting Invasive Plants in Florida using the Australian Weed Risk Assessment. Invasive Plant Science and Management : Pilea nummulariifolia (creeping Charlie) Question number Question Answer Score. Is the species highly domesticated? n.2 Has the species become naturalised where grown?.3 Does the species have weedy races? 2. Species suited to Florida's USDA climate zones (-low; -intermediate; 2-high) Quality of climate match data (-low; -intermediate; 2-high) Broad climate suitability (environmental versatility)? 2.4 Native or naturalized in habitats with periodic inundation 2.5 Does the species have a history of repeated introductions outside its natural y range? 3. Naturalized beyond native range y 3.2 Garden/amenity/disturbance weed y 3.3 Weed of agriculture y 3.4 Environmental weed n 3.5 Congeneric weed y 4. Produces spines, thorns or burrs n 4.2 Allelopathic n 4.3 Parasitic n 4.4 Unpalatable to grazing animals 4.5 Toxic to animals n 4.6 Host for recognised pests and pathogens 4.7 Causes allergies or is otherwise toxic to humans n 4.8 Creates a fire hazard in natural ecosystems n 4.9 Is a shade tolerant plant at some stage of its life cycle y 4. Grows on infertile soils (oligotrophic, limerock, or excessively draining soils) y 4. Climbing or smothering growth habit y 4.2 Forms dense thickets? 5. Aquatic n
2 5.2 Grass n 5.3 Nitrogen fixing woody plant n 5.4 Geophyte 6. Evidence of substantial reproductive failure in native habitat 6.2 Produces viable seed y 6.3 Hybridizes naturally 6.4 Self-compatible or apomictic n 6.5 Requires specialist pollinators n 6.6 Reproduction by vegetative fragmentation y 6.7 Minimum generative time (years) 7. Propagules likely to be dispersed unintentionally (plants growing in heavily trafficked areas) 7.2 Propagules dispersed intentionally by people y 7.3 Propagules likely to disperse as a produce contaminant n 7.4 Propagules adapted to wind dispersal n 7.5 Propagules water dispersed n 7.6 Propagules bird dispersed 7.7 Propagules dispersed by other animals (externally) n 7.8 Propagules dispersed by other animals (internally) Prolific seed production 8.2 Evidence that a persistent propagule bank is formed (> yr) 8.3 Well controlled by herbicides 8.4 Tolerates, or benefits from, mutilation or cultivation 8.5 Effective natural enemies present in Florida, or east of the continental divide Total Score Outcome Reject* *Used secondary screen from: Daehler, C. C., J.L. Denslow, S. Ansari, and H. Kuo. 24. A risk assessment system for screening out harmful invasive pest plants from Hawaii s and other Pacific islands. Conserv. Biol. 8:
3 section # questions answered satisfy minimum? A 6 yes B 9 yes C 2 yes total 27 yes Data collected Question number Reference Source data. no evidence of selection for reduced weediness Whistler (2) Tropical Ornamentals: a Guide. 2. Lorenzi (2) Plantas Daninhas do Brasil. Instituto Plantarum.. native to the Caribbean area 2. also naturalized in Brazil Whistler (2) Tropical Ornamentals: a Guide. "widely cultivated for its attractive leaves and creeping habit" 3. Lorenzi (2) Plantas Daninhas do Brasil. "easily escapes cultivation, becoming undesirable" 3.2 "easily escapes cultivation, becoming Lorenzi (2) Plantas Daninhas do Brasil. undesirable It can be found infesting uncultivated terrain" 3.3. Lorenzi (2) Plantas Daninhas do Brasil. 2. Holm (979) A Geographical Atlas of World Weeds. John Wiley and Sons.. "it can be found infesting banana and apple orchards" 2. considered a common weed of agriculture in Trinidad 3.4 no evidence 3.5 Holm (979) A Geographical Atlas of World P. microphylla considered a common Weeds. John Wiley and Sons. weed of agriculture in Hawaii. 4. Liogier (985) Descriptive Flora of Puerto Rico and Adjacent Islands. Spermatophyta. Vol. : Casuarinaceae to Connaraceae. Editorial de la Universidad de Puerto Rico. no description of these traits 4.2 no evidence 4.3 Liogier (985) Descriptive Flora of Puerto Rico and Adjacent Islands. Spermatophyta. Vol. : Casuarinaceae to Connaraceae. Editorial de la Universidad de Puerto Rico. no description of this no mention of toxicity in horticultural or toxicity references 4.6 3
4 4.7 no mention of toxicity in horticultural or toxicity references 4.8 no evidence 4.9. Whistler (2) Tropical Ornamentals: a Guide. 2. Adams (972) Flowering Plants of Jamaica. University of the West Indies, Mona, Jamaica. 4.. Adams (972) Flowering Plants of Jamaica. University of the West Indies, Mona, Jamaica. 2. Liogier (985) Descriptive Flora of Puerto Rico and Adjacent Islands. Spermatophyta. Vol. : Casuarinaceae to Connaraceae. Editorial de la Universidad de Puerto Rico. 4. USDA, NRCS. 25. The PLANTS Database, Rouge, LA USA. 4.2 Lorenzi (2) Plantas Daninhas do Brasil. 5. terrestrial 5.2 USDA, NRCS. 25. The PLANTS Database, Rouge, LA USA. Urticaceae 5.3 USDA, NRCS. 25. The PLANTS Database, Rouge, LA USA. Urticaceae Lorenzi (2) Plantas Daninhas do Brasil Renner and Feil (993) Pollinators of tropical dioecious angiosperms. American Journal of Botany 8: Whistler (2) Tropical Ornamentals: a Guide. 2. Renner and Feil (993) Pollinators of tropical dioecious angiosperms. American Journal of Botany 8: Whistler (2) Tropical Ornamentals: a Guide. 2. Lorenzi (2) Plantas Daninhas do Brasil. Instituto Plantarum Whistler (2) Tropical Ornamentals: a Guide.. "partially shaded places are preferred" 2. "Locally common, on shaded roadside banks and limestone walls". "Locally common, on shaded roadside banks and limestone walls" 2. "on shaded banks and rocks in forests" growth habit: vine, forb/herb "forming dense infestations" [climbing, but low?] "propagates itself by seeds and stolons" genus Pilea is dioecious. tiny, inconspicuous green flowers 2. genus Pilea is wind-pollinated. roots at nodes 2. "propagates itself by seeds and stolons" "widely cultivated for its attractive leaves and creeping habit" 7.3 no evidence 7.4 Whistler (2) Tropical Ornamentals: a Guide. fruit a tiny green achene [no evidence 4
5 of adaptations for wind dispersal] 7.5 no evidence no evidence of any means of attachment
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