Myriophyllum gracile Benth. APNI* 
Description: Perennial herb, aquatic or fully emergent; stems mostly 1 mm diam.
Emergent leaves alternate, linear to narrow-lanceolate or pinnately divided into 3–7 segments, 5–10 mm long, margins toothed or entire.
Plants usually monoecious, sometimes dioecious, flowers solitary in the axils. Male flowers sessile; sepals linear-lanceolate; petals 2–2.5 mm long, creamy-yellow with a reddish tip. Female flowers sessile or subsessile; sepals and petals absent; stigmas white.
Mericarps cylindrical, c. 0.5 mm long, yellow-brown to deep reddish brown.
Distribution and occurrence:
NSW subdivisions: NC, CC, CT, CWS
Other Australian states: Qld
Text by Peter G. Wilson
Taxon concept:
| | Key to the varieties | |
| 1 | Leaves pinnately divided into usually 5 narrow segments, mostly 5–10 mm long. Male and female flowers usually on the same shoot, sometimes on separate shoots. Mericarps deep reddish brown, sparsely papillose | var. gracile |
| Leaves linear to narrow-lanceolate, entire or shortly toothed, mostly 5–8 mm long. Male and female flowers on the same shoot or some shoots have females only. Mericarps deep reddish brown, densely papillose | var. lineare |
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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