Jacksonia horrida is a species of flowering plant in the family Fabaceae and is endemic to the south-west of Western Australia. It is an erect or spreading to prostrate, bushy shrub with greyish-green branches ending in short, flattened, sharply-pointed side branches, the leaves reduced to scales and the flowers scattered and yellow-orange with red markings.
| Jacksonia horrida | |
|---|---|
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| In Leeuwin-Naturaliste National Park | |
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. horrida
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| Binomial name | |
| Jacksonia horrida | |
| Synonyms[1] | |
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Description
editJacksonia horrida is an erect or spreading to prostrate, bushy shrub that typically grows up to 0.1–4 m (3.9 in – 13 ft 1.5 in) high and 0.8–1.1 m (2 ft 7 in – 3 ft 7 in) wide. The branches are greyish-green, ending in short, flattened, sharply-pointed side branches 5–43 mm (0.20–1.69 in) long and 1.5–4 mm (0.059–0.157 in) wide. The penultimate branches are densely hairy. The leaves are reduced to broadly egg-shaped scale-leaves 0.7–1.7 mm (0.028–0.067 in) long and 0.5–1.6 mm (0.020–0.063 in) wide. The flowers are scattered on the branches with scale leaves at the base on a pedicel 4–7.5 mm (0.16–0.30 in) long, with egg-shaped bracteoles that fall off as the flowers open. The floral tube is 0.9–1.4 mm (0.035–0.055 in) long and the sepals are membranous, 8.0–9.7 mm (0.31–0.38 in) long and 1.5–1.8 mm (0.059–0.071 in) wide. The standard petal is yellow-orange with red markings, 8.4–8.6 mm (0.33–0.34 in) long and 11–12 mm (0.43–0.47 in) deep, the wings yellow-orange with red markings, 8.3–8.6 mm (0.33–0.34 in) long and 3.3–4.1 mm (0.13–0.16 in) deep, and the keel is red, 7.9–8.0 mm (0.31–0.31 in) long. The stamens have pink filaments 5.2–9.7 mm (0.20–0.38 in) long. Flowering occurs from throughout the year, and the fruit is a woody, densely hairy pod 6.5–11.3 mm (0.26–0.44 in) long and 2.8–4.7 mm (0.11–0.19 in) wide.[2][3]
Taxonomy
editJacksonia horrida was first formally described in 1825 by Augustin Pyramus de Candolle in his Prodromus Systematis Naturalis Regni Vegetabilis.[4][5] The specific epithet (horrida) means 'prickly' or 'very rough'.[6]
Distribution and habitat
editThis species of Jacksonia grows in shrubland or woodland, often in winter-wet areas or on coastal dunes, between Lake Clifton and West Cape Howe in the Esperance Plains, Jarrah Forest, Swan Coastal Plain and Warren bioregion of south-western Western Australia.[2][3]
References
edit- ^ a b "Jacksonia horrida". Australian Plant Census. Retrieved 24 July 2024.
- ^ a b Chappill, Jennifer A.; Wilkins, Carolyn F.; Crisp, Michael D. (2007). "Taxonomic revision of Jacksonia (Leguminosae: Mirbelieae)". Australian Systematic Botany. 20 (6): 593–597.
- ^ a b "Jacksonia horrida". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
- ^ "Jacksonia horrida". Australian Plant Name Index. Retrieved 22 July 2024.
- ^ de Candolle, Augustin P. (1825). Prodromus systematis naturalis regni vegetabilis. Vol. 2. Paris: Sumptibus Sociorum Treuttel et Würtz. p. 107. Retrieved 24 July 2024.
- ^ George, Alex; Sharr, Francis (2021). Western Australian Plant Names and Their Meanings (4th ed.). Kardinya, WA: Four Gables Press. p. 219. ISBN 9780958034180.