Cycnogeton rheophilum (Aston) Mering & Kadereit APNI*
Synonyms: Triglochin rheophilum Aston orth. var. APNI*
Triglochin rheophila Aston APNI*
Description: Robust, rhizomatous, emergent, perennial aquatic herb. Rhizome 7–18(-30) mm thick, woody, roots ending in tubers; tubers elongate, 20–145 mm long, 4–14 mm diam., c. 2.5–20 X as long as broad.
Leaves more or less flat, strap-like, thin, 41–450 cm long, 2–6 mm wide, more or less linear in cross-section, usually submerged and trailing in fast-flowing water, often spiralled or with margin undulate; leaf sheaths narrow, mostly inrolled.
Inflorescence with rachis and pedicels green; carpels 6(-7).
Infructescence more or less ellipsoid, with scape submerged, trailing, often semi-flattened; fruits c. 20–232 per infructescence, more or less ellipsoid, 9–16 mm long; carpels usually all maturing; seeds straight, sometimes twisted.
Flowering: Flowers September–February
Distribution and occurrence: North Coast, Central Coast, South Coast; also Qld, Vic., and Tas.
Grows in flowing clear fresh water in permanent streams and rivers.
NSW subdivisions: NC, CC, SC
Other Australian states: Qld Vic. Tas.
Text by B.J. Conn (2004), Triglochin rheophila Aston
Taxon concept: S. von Mering & J.W. Kadereit in O. Seberg et al. (eds), Diversity, Phylogeny, and Evolution in the Monocotyledons: 73 (2010); following Australian Plant Census (CHAH 2014)
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.