L., Sp. Pl. 576 (1753).
Synonymy: Not Applicable
Common name: None
Perennial herbs with a rhizome above or under ground and frequently rooting at the nodes, producing erect quadrangular stems to 80 cm high, often tinged purple, more or less branched, glabrous or with few scattered simple hairs; leaves with the petiole 0-15 mm long; blade ovate, lanceolate, rarely elliptic-lanceolate, 1.5-8 x 1-3 cm, acute, rarely obtuse, serrate to dentate, with 5-8 pairs of secondary veins, glabrous or with few scattered hairs and with sessile glands on the undersurface.
Inflorescence a thyrse without a distinct peduncle and often branched below, with sessile cymose part-inflorescences with many pedicelled flowers in dense clusters each subtended by narrow bracts unlike the leaves; sepals regularly connate to two-thirds of their length, 10-veined, 3-4 mm long, with pointed lobes, with scattered hairs mainly along a central ridge and often ciliate and with sessile glands on the outside, glabrous inside; corolla lilac to pink, vaguely 2-lipped, with a posterior lip more or less 2-lobed to emarginate with an anterior lip with 3 subequal lobes, with few hairs and sessile glands on the outside, glabrous inside; stamens inserted just below the throat of the corolla tube, with filaments glabrous; anthers 2-celled, included or exserted; ovary on a thick disk, 4-lobed, with a slender style inserted near the base, with a shortly 2-fid stigma.
No fruit developed.
Flowering time: No flowering time is available
SA Distribution Map based
on current data relating to
specimens held in the
State Herbarium of South Australia
M. xpiperita is a hybrid between the Old World species M. aquatica L. and M. spicata L. and all plants are sterile. As the one parent (M. aquatica) has not been recorded naturalised in S.Aust. and is rarely cultivated, spontaneous hybridisation seems unlikely and all the material of M. xpiperita found naturalised spreads vegetatively by means of its rhizome. It is therefore necessary to note that two varieties of hybrid origin within this species can be distinguished.
Key to Infraspecific taxa:
Not yet available