Flowers of parryella filifolia
, the only member of its genus, are atypical for the fabaceae family, since the flowers lack petals, consisting only of a narrow, cone-shaped, yellowish-green calyx, with five tiny lobes at the tip, from which project ten stamens - pale yellow filaments and darker yellow anthers, attached in their middle. Calyces have ten faint ribs at their base. The ascending flowers are borne in a narrow, unbranched cluster, up to 5 inches long.
Leaves are pinnately divided into up to 20 pairs of tiny leaflets, around half an inch long and less than a tenth of an inch across, their margins slightly upcurved. Leaves, stems and calyces have a sparse covering of short, strigose hairs. The short, slightly elongated pods contain one seed; they are hairless, greenish-yellow, flecked with darker glands.