Oenanthe Aquatica

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Oenanthe aquatica COMMON NAME Horsebane FAMILY Apiaceae AUTHORITY Oenanthe aquatica (L.) Poiret FLORA CATEGORY Vascular – Exotic STRUCTURAL CLASS Herbs - Dicotyledons other than Composites NVS CODE OENAQU BRIEF DESCRIPTION Upright to sprawling floating marginal perennial aquatic plant up to 1.5 m Oenanthe aquatica plants. Photographer: Paul tall. Foliage is finely divided and hemlock-like, stems are hollow and Champion reddish in colour. Submerged leaves are finely divided with threadlike segments. DISTRIBUTION Locally common in Marlborough. HABITAT Still and slow flowing water bodies, marshes and seasonally flooded wetlands. FEATURES Flowers of Oenanthe aquatica. Photographer: Biennial to perennial sprawling or erect herb up to 1.5 m tall, either Trevor James (AgResearch) floating (sometimes with submerged foliage) or terrestrial. Stems hollow, slightly grooved, usually tinged reddish purple. Emergent leaves bi to 4- pinnate, with segments up to 10 mm long, segments either crenate or pinnatifid. Submerged leaves 3-4 pinnate with filiform pinnae. Flowers in an umbel, either terminal or opposite a leaf 1-5 cm diameter, with (3)-5-12 rays. Subtending bracts 1 - (3) or lacking. Flowers white or pink tinged c. 2 mm diameter. Fruit ovoid-cylindric 3-5 mm long, prominantly ribbed. SIMILAR TAXA American horsebane (Oenanthe sarmentosa) and water celery (Apium nodiflorum) have less divided leaves with longer segments. Both species for dense sprawling mats, with stems rooting at the nodes. FLOWERING Summer FLOWER COLOURS Red/Pink, White FRUITING Summer-autumn LIFE CYCLE Seed floating and dispersed by water. YEAR NATURALISED 1940 ORIGIN Europe and Western Asia REASON FOR INTRODUCTION Unknown, possibly a seed contaminant CONTROL TECHNIQUES Not controlled in New Zealand. 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-aquatica/.

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