Source: https://www.inaturalist.org/observations/36935140 (I, Dwergenpaartje, am the author and uploader under the name botanicexpedition2019nl-saf). According to Charles Stirton, leading botanist on this genus, Otholobium saxosum differs from O. bowieanum in its stiffish erect to semi-erect habit (vs spreading mound-like habit), its narrower, 4 – 7 mm leaflets (vs 8 – 10 mm), sparsely pilose young leaves (vs sparsely hispid), straight mucro (vs hooked), congested inflorescences hidden in leaves (vs lax and exposed), different nectar guides, and free vexillary calyx teeth (vs partially fused).
He searched for this species fruitlessly for over 40 years, but it seems to appear just after fires so it is luck if one sees it. Not seen since 1986.
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