About 60 cm high, moderately branched, with pubescent branchlets. Leaves mostly 5-7 mm long, ovate or lanceolate-ovate, obtuse or subacute, much compressed, ± keeled on the dorsal surface, glabrous, at first erect-spreading, often spreading or reflexed. Flower-heads mostly 8-9 mm wide, orbicular, terminating short leafy branchlets, in almost corymbose clusters. Bract and bracteoles spathulate, clothed with caducous unicellular hairs on the dorsal surface, reaching the middle of the petals. Calyx-tube obconic, with caducous unicellular hairs: calyx-lobes linear, acute, scarcely half as long as the petals, with caducous unicellular hairs on the dorsal surface. Petals about 3.5 mm long, oblong, obtuse, tapering towards the base, glabrous, bicarinate from the middle downwards. Stamens about twice as long as the petals: anthers scarcely 1.5 mm long, oblong: thecae free 2/3 of their length. Ovary almost entirely inferior. Fruit unknown.
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Like B. abrotanoides but leaves spreading, cordate, very broad below.