Boronia section Ovatae (Paul G.Wilson) Duretto

Duretto, Marco F., Heslewood, Margaret M. & Bayly, Michael J., 2023, A molecular phylogeny of Boronia (Rutaceae): placement of enigmatic taxa and a revised infrageneric classification, Australian Systematic Botany 36 (2), pp. 81-106 : 104-105

Boronia section Ovatae (Paul G.Wilson) Duretto

& Heslewood, comb. nov., stat. nov.

Boronia series Ovatae Paul G.Wilson , Nuytsia 1: 204 (1971). Type: Boronia ovata Paul G.Wilson.

Hairs simple. Branches, including cortex, not articulated (continuous), obviously glandular, glabrous, puberulous or pilose. Leaves opposite–decussate, simple. Inflorescence a terminal cyme, cymes and solitary flowers sometimes also in axils of upper leaves; peduncle present, sometimes minute; bracts and bracteoles persistent. Sepals imbricate in bud, persistent. Petals imbricate in bud, with or without a subterminal apiculum on the abaxial surface, multiveined from base or with a single vein, caduous. Staminal filaments glabrous or pilose, swollen and verrucose towards apex, with tip appearing subterminal adaxially. Stigma minute, scarcely wider than style. Seed with a smooth sclerotesta or minutely tuberculate, cell walls not usually visible, glossy; adaxial surface with linear hilum in a groove, or with a glossy cover to the raphe; embryo unknown.

A section of three species confined to south-western Australia: Boronia humifusa , B. ovata , and B. scabra (three subspecies). Boronia humifusa has several unique features such as the petals having a single vein, a massive stigma and style, and a unique seed morphology ( Wilson 1998).