Les, Donald H. , Capers, Robert S. , Tippery, Nicholas P. .
Glossostigma (Phrymaceae) in North America: taxonomy and invasive potential.
FIELD surveys in North America confirm the naturalization of Glossostigma plants at 19 localities in four states: Connecticut, New Jersey, Pennsylvania, and Rhode Island. DNA sequence analysis of plants from 14 sampled populations identifies them as Glossostigma cleistanthum, a nonindigenous species native to Australia and New Zealand. These results correct earlier misidentifications of North American plants as Glossostigma diandrum. The first North American record of G. cleistanthum (1992) is from a tidal Connecticut wetland, also a Ramsar site. Morphological analyses differentiate G. cleistanthum from G. diandrum by its longer leaves and production of both cleistogamous and chasmogamous flowers in response to ecological conditions. Glossostigma cleistanthum spreads rapidly within and between both artificial and natural habitats. A survey of more than 100 lakes indicated that G. cleistanthum occurs mainly in waters with high clarity and low pH, alkalinity, conductivity and phosphorous. This affinity for oligotrophic conditions makes this species a particular threat to pristine natural aquatic communities where imperiled species often occur.
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1 - University of Connecticut, Ecology & Evolutionary Biology, 75 North Eagleville Road, U-3043, Storrs, Connecticut, 062693043, USA
2 - Connecticut Agricultural Experiment Station, Invasive Aquatic Plant Survey Program, 123 Huntington St., P.O. Box 1106, New Haven, Connecticut, 06504, USA
Presentation Type: Oral Paper:Papers for Topics
Date: Tuesday, August 1st, 2006
Time: 1:30 PM