Family: Hydrocharitaceae
Hydrilla verticillata
Citation:
Royle, Ill. Bot. Himal. Mount. 1:376 (1839).
Synonymy: Serpicula verticillata L.f., Suppl. 416 (1782).
Common name: Waterthyme, hydrilla.
Description:
Submerged, much-branched, usually dioecious; leaves strongly sérrulate, linear to lanceolate, 6-40 mm long, 1-nerved.
Male flower with perianth-segments 1.2-3 mm long, the sepals broadly ovate-elliptic, the petals narrow-linear; female flowers on pedicels to 10 cm long and with a similar perianth to the male.
Published illustration:
Sainty & Jacobs (1981) Waterplants of New South Wales, pp. 238, 240.
Distribution:
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Grows in still or slow-flowing water to at least 3.5 m deep.
S.Aust.: MU. all mainland States. Europe, Asia and Africa.
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Conservation status:
native
Flowering time: April and May.
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SA Distribution Map based
on current data relating to
specimens held in the
State Herbarium of South Australia
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Biology:
Wind-pollinated; the male flower becomes detached and free-floating, the female flower opens on the surface but remains attached.
Author:
Not yet available
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