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Erect shrub, 1.5-4(-6) m high. Fl. white-cream, Jun to Dec or Jan (mainly Sep-Nov). Yellow or red sand. Sandplains.
Beard’s Provinces: Eremaean Province, South-West Province.
IBRA Regions: Avon Wheatbelt, Central Ranges, Coolgardie, Geraldton Sandplains, Great Victoria Desert, Little Sandy Desert, Mallee, Murchison, Yalgoo.
IBRA Subregions: Avon Wheatbelt P1, Avon Wheatbelt P2, Central, Eastern Goldfield, Eastern Mallee, Eastern Murchison, Edel, Lesueur Sandplain, Mann-Musgrave Block, Shield, Southern Cross, Tallering, Trainor, Western Mallee.
Local Government Areas (LGAs): Bruce Rock, Coolgardie, Coorow, Corrigin, Dalwallinu, Dundas, East Pilbara, Esperance, Greater Geraldton, Kalgoorlie-Boulder, Kellerberrin, Kondinin, Lake Grace, Laverton, Leonora, Meekatharra, Menzies, Merredin, Moora, Mount Marshall, Narembeen, Ngaanyatjarraku, Northampton, Perenjori, Tammin, Trayning, Westonia, Wiluna, Wongan-Ballidu, Wyalkatchem, Yalgoo, Yilgarn.
Habit and leaf form. Shrubs, 2–4 m high. Branchlets not glaucous. Leaves simple, 70–150 mm long overall. Leaf blade 0.5–2 mm wide, dissected or undissected, flat, linear, subpinnatisect, not further divided. Leaf lobes 60–180 mm long, 1–2 mm wide. Margins entire, revolute, exposing the lower surface of the leaf blade, forming two grooves with the midvein.
Inflorescence and floral features. Inflorescence axillary, or terminal; a raceme. Flowers white or grey, very irregular. Pedicel 2–3 mm long. Perianth 4–6 mm long, simple-hairy, 4 -partite; lobes all free. Stamens 4. Pistil 15–20 mm long, stipitate; stipe 1.5–2.5 mm long. Ovary hairy. Styles glabrous, white or yellow. Pollen presenter oblique.
Fruit features. Fruit viscid, oblong or ellipsoidal, simple hairy or glandular hairy, 15–20 mm long.
Flowering Time. January, or June, or July, or August, or September, or October, or November, or December.
Habitat. Amongst medium trees, or low trees, or tall (sclerophyll) shrubland, or low (sclerophyll) shrubland, or spinifex grassland; in rocky or stony soil, or sand, or loam; occupying sandplains.
Distribution. Western Australia, Northern Territory, South Australia, New South Wales, Victoria. Western Australian Botanical Province(s): Eremaean and South-west; IBRA Bioregions ER: LSD, CR, YAL, MUR, GVD, and COO; IBRA Bioregions SW: GS, AW, and MAL.
Etymology. pterosperma (Gk): pteron wing + sperma seed.
Descriptions were generated using DELTA format and DELTA software: Dallwitz (1980) and Dallwitz, Paine and Zurcher (1993 onwards, 1995 onwards, 1998)
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