Morphology Diagnostic features Likely to be confused with
S. isoetifolium is the only north Queensland seagrass whose leaves are round in cross-section and thus it is easily recognized. The leaves of S. isoetifolium are quite thin (1-2 mm diameter), narrowed at the base and gradually taper off to a point at the leaf tip. Leaves typically range in length from 7-30 cm. The rhizomes are thin and herbaceous, and at each node is a short erect shoot bearing 2-3leaves. The leaf sheath is 1.5-4.0 cm long. A ligule is present.
Leaf narrow and round in cross-section, gradually tapering to a point.
In a field situation, thin-leaved forms of Halodule species, Z.capricorni, C.rotundata or T.hemprichii may superficially resemble S.isoetifolium. However, upon closer examination, the cylindrical nature of S.isoetifolium leaves facilitates accurate identification.
Halophila ovalis /
Zostera capricorni /
Halophila spinulosa /
Syringodium isoetifolium /
Cymodocea serrulata /
Halodule spp /
Halophila decipiens
