Common name: One-rowed Watercress
Nasturtium microphyllum Boenn. ex Rchb. APNI* Synonyms: Rorippa microphylla Boenn. ex Rchb. APNI*
Description: Decumbent perennial, stems to 40 cm long.
Leaves pinnate, mostly to 10 cm long, with 1–9 pairs of pinnae; pinnae ± circular, margins crenate to entire.
Sepals 1.5–3 mm long. Petals 4–5 mm long, white. Siliqua curved, 15–30 mm long, 1–2 mm wide, ascending; seeds in 1 row per loculus; pedicel spreading to reflexed, 10–14 mm long.
Distribution and occurrence: in mud or shallow water; widespread. Native of Europe, W Asia.
NSW subdivisions: *CC, *NT, *CT, *ST, *SWS
Other Australian states: *Vic. *Tas. *S.A.
Nasturtium has been included in Rorippa by some authors, including Hewson, H.J. in George, A.S. (ed) (1982) Flora of Australia 8:322-326, and Retter L. & Harden, G.J. in Flora of New South Wales Vol. 1: 478-480 (1990).
We are here following I. Al-Shehbaz & R.A. Price, Novon, 8: 124-126 (1998) in recognising Nasturtium as a genus distinct from Rorippa, based on molecular phylogenetic evidence that Nasturtium is more closely related to Cardamine than Rorippa. This brings accepted names in NSW in line with those accepted in Victoria (VicFlora, accessed 20 Feb 2020) and Tasmania (de Salas, M.F. & Baker, M.L. (2016), A Census of the Vascular Plants of Tasmania, including Macquarie Island: 27). K.L.Gibbons 20 Feb. 2020.
Text by L. Retter & G.J. Harden, Flora of New South Wales Vol. 1: 478-480 (1990)
Taxon concept: Australian Plant Census (accessed May 2017)
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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