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Lepidium peregrinum Thell.
Family Brassicaceae
Lepidium peregrinum Thell. APNI*

Description: Annual herb, branching, erect to decumbent, to 40 cm high, glabrous or slightly papillose.

Basal leaves to 15 cm long, 2-pinnatisect, ciliate; stem leaves reducing to lanceolate, toothed, acute, 2–6 cm long, 1–8 mm wide.

Inflorescence a lateral raceme. Sepals 0.5–0.8 mm long. Petals reduced or absent. Stamens usually 2. Silicula ovate, 2–2.7 mm long, 1.5–2 mm wide, wings slight in upper half, forming a shallow notch; pedicel 3–5 mm long, horizontal to recurved, finely hairy above.

Silicula ovate, 2–2.7 mm long, 1.5–2 mm wide, wings slight in upper half, forming a shallow notch; pedicel 3–5 mm long, horizontal to recurved, finely hairy above.


Illustration
C. Wardrop

Distribution and occurrence: Rare species, possibly extinct, recorded from the Blue Mtns and near the Qld border.
NSW subdivisions: CC, NT, NWS, CWS
Other Australian states: Qld
Threatened species: NSW BCA: Endangered; Commonwealth EPBC: Endangered
AVH map***

May be confused with L. pseudohyssopifolia, which has glabrous pedicels, and with L. pseudotasmanicum, which has acutely pinnatifid to entire and dentate-margined, oblanceolate to cuneate leaves. Also similar to L. africanum, which has all leaves attenuate-based at the point of insertion. Lepidium peregrinum has mid-cauline, branch-subtending leaves with auriculate to sagittate bases at the point of insertion. Although fruit shape and size, and pedicel length in relation to fruit length are used to distinguish the introduced L. africanum from L. peregrinum, these characters are not completely reliable.

Text by L. Retter & G. J. Harden; modified by S.F. McCune Mar 2021.
Taxon concept: N.H. Scarlett (1999)


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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