Oenanthe Sarmentosa

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Oenanthe sarmentosa COMMON NAME American horsebane FAMILY Apiaceae AUTHORITY Oenanthe sarmentosa DC. FLORA CATEGORY Vascular – Exotic STRUCTURAL CLASS Herbs - Dicotyledons other than Composites BRIEF DESCRIPTION Sprawling floating marginal perennial aquatic plant up to 1.5 m tall. Foliage is divided but less so than horsebane, stems are hollow and green in colour. Oenanthe sarmentosa. Photographer: Trevor James (AgResearch) DISTRIBUTION Locally common in the vicinity of Greymouth, Westland. HABITAT Stream edges and swamps. FEATURES Biennial to perennial sprawling herb up to 1.5 m tall, with floating stems hollow, grooved, green, usually rooting at the nodes. Emergent leaves bipinnate, tripinnate on lower branches with segments up 10-35 mm long, segments lobed. Submerged leaves absent. Flowers in an umbel, either terminal or opposite a leaf 2-5 cm diameter, with 10-20 rays. Subtending bracts 1 or lacking. Flowers white c. 2 mm diameter. Fruit cylindric 2.5-3.5 mm long, prominantly ribbed. SIMILAR TAXA Horsebane (Oenanthe aquatica) and water celery (Apium nodiflorum). Horsebane has more divided leaves with shorter segments. Water celery has less divided (pinnate) leaves. FLOWERING Summer Flowers of Oenanthe sarmentosa. FLOWER COLOURS Photographer: Trevor James (AgResearch) White FRUITING Summer-autumn LIFE CYCLE Vegetative spread by stoloniferous growth and by floating seeds. YEAR NATURALISED 1975 ORIGIN W. North America REASON FOR INTRODUCTION Unknown, possibly a seed contaminant CONTROL TECHNIQUES Not controlled in New Zealand. ETYMOLOGY sarmentosa: Twiggy ATTRIBUTION Factsheet prepared by Paul Champion and Deborah Hofstra (NIWA). REFERENCES AND FURTHER READING Johnson PN, Brooke PA (1989). Wetland plants in New Zealand. DSIR Field Guide, DSIR Publishing, Wellington. 319pp. MORE INFORMATION https://www.nzpcn.org.nz/flora/species/oenanthe-sarmentosa/.

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