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Mentha x piperita L.
Family Lamiaceae
Common name: Peppermint

Mentha x piperita L. APNI*

Description: Herb to 80 cm high, rhizomatous of stoloniferous, frequently rooting at nodes; branches ascending, often tinged purple, glabrous or with a few scattered hairs.

Leaves with lamina ovate, narrow-ovate, rarely elliptic-ovate, 1.5–8 cm long, 1–3 cm wide; apex acute or rarely obtuse; margins toothed; petiole 0–15 mm long.

Inflorescence terminal; clusters dense, many-flowered, subtended by greatly reduced leaf-like bracts. Calyx 10-veined, fused to two-thirds its length, with scattered hairs along medial ridge and often lobes ciliate. Corolla 5–6 mm long, lilac to pink. Anthers included or exserted.

Fruit not developed.


Herbarium
Sheet

Flowering: December–May.

Distribution and occurrence: Naturalized in moist sites. Originated in Eur.
NSW subdivisions: *NC, *CC, *CT, *ST, *SWS
AVH map***

M. X piperita is a sterile hybrid between M. aquatica L. and M. X spictata L. Two variants of this hybrid (known as nothomorphs) are naturalized in N.S.W.

Text by B. J. Conn
Taxon concept: Flora of NSW 3 (1992)

 Key to the varieties 
1Leaves narrow-ovate to elliptic, to 7 cm long; odour pungent, peppermint. Inflorescence cylindrical, spike-like, to 6 cm long, with flower clusters becoming separated. Anthers included.var. piperita
Leaves ovate to broad-ovate, 2–9 cm long; youngest leaves often with a red margin; odour reminiscent of 'Eau de Cologne'. Inflorescence of 1 or more distinct globose clusters, to 2 cm long. Anthers exserted.var. citrata

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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