Synaphea stenoloba is a species of flowering plant in the family Proteaceae and is only known from a few locations in the south-west of Western Australia. It is a shrub with many hairy stems, tripinnatipartite leaves, the end lobes erect, and spikes much longer than the foliage with crowded, yellow flowers.
Description Synaphea stenoloba is a tufted shrub that typically grows to a height of and has many stems covered with soft hairs. The leaves are tripinnatipartite, long and wide on a petiole long, each lobe divided three times, the end lobes erect, linear, wide. The flowers are yellow and crowded on spikes much longer than the foliage, up to long on a sometimes branched peduncle long. The bracts are egg-shaped, long and glabrous. The perianth opens more or less widely, the upper tepal long and wide and the lower tepal about long. The stigma is egg-shaped and lobed, long and wide and the ovary is covered with soft hairs. Flowering occurs in September and October, and the fruit is oval, long and covered with short hairs.
Taxonomy Synaphea stenoloba was first formally described in 1995 by Alex George in the Flora of Australia from specimens he collected north-east of Pinjarra in 1993. The specific epithet (stenoloba) means 'narrow-lobed', referring to the leaf lobes.
Distribution and habitat This species of Synaphea is found on winter wet flats with low heath sedgeland and on granite outcrops in several small locations near Pinjarra in the Swan Coastal Plain bioregion of south-western Western Australia.
Conservation status Synaphea stenoloba is listed as Threatened under the Biodiversity Conservation Act 2016.
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