Irenepharsus trypherus Hewson APNI*
Description: Annual herb to 1 m high, spreading to erect, glabrous.
Stem leaves mostly 4–8 cm long, linear to lanceolate to elliptic, toothed; petiolate.
Sepals c. 2 mm long, spreading, somewhat petaloid. Petals 3–4 mm long, white. Siliqua linear, 5–20 mm long, 0.7–1 mm wide, curved, ascending; pedicel 6–10 mm long, spreading to slightly reflexed; seeds without wing, sticky when wet but scarcely mucilaginous.
Siliqua linear, 5–20 mm long, 0.7–1 mm wide, curved, ascending; pedicel 6–10 mm long, spreading to slightly reflexed; seeds without wing, sticky when wet but scarcely mucilaginous.
Distribution and occurrence: Not common, grows in gullies on the coast and escarpment between Wollongong and the Shoalhaven R.
NSW subdivisions: CC, SC
Threatened species: NSW BCA: Endangered; Commonwealth EPBC: Endangered
Can be confused with Rorippa gigantea, which has sessile, sagittate stem leaves and dimorphic sepals (inner pair saccate). Irenepharsus trypherus has petiolate stem leaves and petaloid sepals. Leaf size, particularly post fire, is not a reliable character.
Text by L. Retter & G. J. Harden
Taxon concept: Flora of NSW 1 (1990)
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