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| Jacksonia macrocalyx | |
|---|---|
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| Near Wongan Hills | |
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Fabales |
| Family: | Fabaceae |
| Subfamily: | Faboideae |
| Genus: | Jacksonia |
| Species: | J. macrocalyx |
| Binomial name | |
| Jacksonia macrocalyx Meisn. | |
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 0.3–1.0 m (1 ft 0 in – 3 ft 3 in) high and 0.7–1.5 m (2 ft 4 in – 4 ft 11 in) wide. Its branches are greyish-geen, with sharply-pointed phylloclades 1.5–20 mm (0.059–0.787 in) long and 0.3–0.9 mm (0.012–0.035 in) wide. Its leaves are reduced to mid-brown, broadly egg-shaped scales, 0.5–2.5 mm (0.020–0.098 in) long and 0.5–1.2 mm (0.020–0.047 in) wide. The flowers are scattered near the ends of branches on a pedicel 2.5–4.0 mm (0.098–0.157 in) long, with narrowly lance-shaped bracteoles 1.5–1.8 mm (0.059–0.071 in) long on the upper part of the pedicels. The floral tube is 1.3–1.5 mm (0.051–0.059 in) long and the sepals are papery, with lobes 9.0–11.3 mm (0.35–0.44 in) long and 2.7–4.0 mm (0.11–0.16 in) wide. The flowers are yellow, the standard petal 8.7–10.3 mm (0.34–0.41 in) long and 12.6–17 mm (0.50–0.67 in) broad, the wings 11–14.1 mm (0.43–0.56 in) long, and the keel 5.2–5.5 mm (0.20–0.22 in) long. The stamens have white to pale green filaments 2.4–7 mm (0.094–0.276 in) long. Flowering occurs from June to February, and the fruit is a woody hairy, broadly elliptical pod 4.5–7 mm (0.18–0.28 in) long and 2.8–3.8 mm (0.11–0.15 in) 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 (macrocalyx) means 'long sepals'.
Distribution and habitat
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.
Conservation status
Jacksonia macrocalyx is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions.
References
- "Jacksonia macrocalyx". Australian Plant Census. Retrieved 17 December 2024.
- ^ Chappill, Jennifer A.; Wilkins, Carolyn F.; Crisp, Michael D. (2007). "Taxonomic revision of Jacksonia (Leguminosae: Mirbelieae)". Australian Systematic Botany. 20 (6): 585–586.
- ^ "Jacksonia macrocalyx". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
- "Jacksonia macrocalyx". Australian Plant Name Index. Retrieved 17 December 2024.
- Meissner, Carl (1855). "Leguminosae quaedam Australasicae novae". Botanische Zeitung. 13 (2): 26. Retrieved 17 December 2024.
- George, Alex; Sharr, Francis (2021). Western Australian Plant Names and Their Meanings (4th ed.). Kardinya, WA: Four Gables Press. p. 246. ISBN 9780958034180.
| Taxon identifiers | |
|---|---|
| Jacksonia macrocalyx | |