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Myriophyllum pedunculatum Hook.f.
Family Haloragaceae
Myriophyllum pedunculatum Hook.f. APNI*

Description: Perennial herb, aquatic or fully emergent; stems up to 1 mm diam., prostrate with erect laterals.

Leaves all opposite, linear to trifid with segments terete, mostly 4–20 mm long, margins entire or with 1 or 2 lobes.

Plants monoecious; male and female flowers on the same shoot, or different shoots, solitary in the axils. Male flowers initially sessile with the pedicel elongating to 1–4.5 mm long; sepals linear to ovate; petals 1.5–2.5 mm long, red to yellow. Female flowers sessile or shortly pedicellate; sepals small, filiform to triangular; petals absent; stigmas usually red.

Mericarps ovoid to obpyriform, 1–1.5 mm long, reddish purple to black, smooth or warty.

Distribution and occurrence:
NSW subdivisions: NC, NT, CT, ST, NWS
Other Australian states: Vic. Tas.
AVH map***

Text by Peter G. Wilson
Taxon concept:

 Key to the subspecies 
1Stems robust; leaves closely spaced, linear to terete, 4–11 mm long, somewhat fleshy, entiresubsp. pedunculatum
Stems weak; leaves distant, filiform, mostly 15–22 mm long, often with 1 or 2 slender lobessubsp. longibracteolatum

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.
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