Common name: Parrots Feather, Brazilian Water-milfoil
Myriophyllum aquaticum (Vell.) Verdc. APNI*
Synonyms: Myriophyllum brasiliense Cambess. APNI*
Description: Perennial aquatic or semi-aquatic herb; stems 4–5 mm diam., rooting freely from the lower nodes.
Submerged leaves whorled; emergent leaves in whorls of usually 5 or 6, deeply pinnately divided into usually 24–36 linear segments, mostly 25–35 mm long, 5–8 mm wide, glaucous.
Plants dioecious; flowers solitary in axils. Male plants not present in Aust. Female flowers 4 merous, very shortly pedicellate; sepals 0.4–0.5 mm long, white, triangular; petals absent. Ovary 4 locular; styles clavate 0.1–0.2 mm long; stigmas white.
Fruit not formed in Aust.
Distribution and occurrence: in waterways, in some districts it is a troublesome weed. Native of central S Amer.
NSW subdivisions: *NC, *CC, *NT, *CT
Other Australian states: *Qld *Vic. *Tas. *W.A.
Text by Peter G. Wilson
Taxon concept: A.E. Orchard (1990)
APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.