Shrub or small tree. Leaves: petiole slender, 10-12 mm long; lamina lanceolate, 8-20 cm long, 1.5-3 cm wide, glabrous; base attenuate; margin entire; apex obtuse or obtusely acuminate; veins 5-11 pairs. Conflorescence c. 15 cm long; flowers sessile on a common peduncle. Tepals 2-3 cm long, purplish, glabrous except for short, appressed pubescence near apex abaxially. Anthers 4-5 mm long; mucro c. 0.5 mm long; filament c. 0.3 mm long. Hypogynous glands ±scutelliform. Ovary c. 2 cm long; ovules c. 4; style 2-2.5 cm long; pollen presenter 3-4 mm long. Fruit ±ovoid or hemispherical (or at least flat on one side), 3.5-5 cm long, verrucose. Seeds c. 4, ±angular, c. 1.8 cm long, 1.5-1.8 cm wide.
Occurs as a rheophyte at Roaring Meg Creek near China Camp, south of Cooktown, Qld, at an altitude of 300-500 m.
Qld: Timber Reserve 165, Alexandra Logging Area, B.P.M.Hyland 9390 (QRS); Roaring Meg Ck, G.Sankowsky (QRS 77799).
Timber Reserve 165, Baird Logging Area, Qld, 16°02'S, 145°19'E, 22 Sept. 1980, B.P.M.Hyland 10626 ; holo: QRS.
Author - B.P.M.Hyland
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Cite this profile as: B.P.M.Hyland. Hollandaea riparia, in (ed.), Flora of Australia. Australian Biological Resources Study, Department of Climate Change, Energy, the Environment and Water: Canberra. https://profiles.ala.org.au/opus/foa/profile/Hollandaea%20riparia [Date Accessed: 27 March 2025]