Jacksonia macrocalyx
Jacksonia macrocalyx is a species of flowering plant in the family Fabaceae and is endemic to the south-west of Western Australia. It is an erect shrub with greyish-green branches, short, sharply-pointed phylloclades, leaves reduced to scales leaves, yellow flowers, and woody, hairy pods.
Description
Jacksonia macrocalyx is an erect shrub that typically grows to high and wide. Its branches are greyish-geen, with sharply-pointed phylloclades long and wide. Its leaves are reduced to mid-brown, broadly egg-shaped scales, long and wide. The flowers are scattered near the ends of branches on a pedicel long, with narrowly lance-shaped bracteoles long on the upper part of the pedicels. The floral tube is long and the sepals are papery, with lobes long and wide. The flowers are yellow, the standard petal long and broad, the wings long, and the keel long. The stamens have white to pale green filaments long. Flowering occurs from June to February, and the fruit is a woody hairy, broadly elliptical pod long and wide.
Taxonomy
Jacksonia macrocalyx was first formally described in 1855 by Carl Meissner in the journal Botanische Zeitung from specimens collected by James Drummond. The specific epithet means 'long sepals'.
This species of Jacksonia grows in shrubland on sand over laterite from north of Mingenew to Wongan Hills in the Avon Wheatbelt and Geraldton Sandplains bioregions of south-western Western Australia.
Jacksonia macrocalyx is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions.