Spreading, spiny shrub, 0.3-1.7 m high. Fl. white-cream, Jul to Dec or Jan to Feb. Sandy or gravelly soils, sometimes swampy.
Beard’s Provinces: South-West Province.
IBRA Regions: Avon Wheatbelt, Esperance Plains, Jarrah Forest, Mallee, Swan Coastal Plain, Warren.
IBRA Subregions: Avon Wheatbelt P2, Fitzgerald, Northern Jarrah Forest, Perth, Southern Jarrah Forest, Warren, Western Mallee.
IMCRA Regions: WA South Coast.
Local Government Areas (LGAs): Albany, Augusta-Margaret River, Boyup Brook, Bridgetown-Greenbushes, Busselton, Capel, Cranbrook, Dardanup, Denmark, Donnybrook-Balingup, Gnowangerup, Kojonup, Lake Grace, Manjimup, Murray, Nannup, Plantagenet, West Arthur, Williams.
Habit and leaf form. Shrubs, 0.5–1.5 m high. Branchlets not glaucous. Leaves simple, 20–110 mm long overall. Leaf blade dissected, tripartite; shallowly divided; not further divided or biternate. Leaf lobes 5–20 mm long, 1–4 mm wide. Margins revolute or recurved, exposing the lower surface of the leaf blade, forming two grooves with the midvein. Hairs straight.
Inflorescence and floral features. Inflorescence axillary, or terminal; a raceme. Flowers white or cream, very irregular. Pedicel 4–6 mm long. Perianth 2–4 mm long, glabrous, 4 -partite; lobes free and joined. Stamens 4. Pistil 4–6.5 mm long, stipitate; stipe 0.5–1 mm long. Ovary glabrous. Styles glabrous, white or cream. Pollen presenter conical.
Fruit features. Fruit wrinkled, oblong or ellipsoidal, glabrous, 7.5–9.5 mm long.
Flowering Time. July, or August, or September, or October, or November (sporadically in other months).
Habitat. Amongst medium trees, or tall (sclerophyll) shrubland, or low (sclerophyll) shrubland; in sand, or loam.
Distribution. Western Australia. Western Australian Botanical Province(s): South-west; IBRA Bioregions SW: SWA, AW, JF, MAL, WAR, and ESP. Western Australian native; endemic to Western Australia.
Etymology. trifida (L): t. cleft into three parts, three-forked.
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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