Prostanthera nudula, commonly known as Mount Illbillee mintbush,[2] is a species of flowering plant in the family Lamiaceae and is endemic to South Australia. It is a shrub with branches that become spiny, narrow elliptic leaves and pale cream-coloured flowers with yellow dots inside.
| Prostanthera nudula | |
|---|---|
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Lamiales |
| Family: | Lamiaceae |
| Genus: | Prostanthera |
| Species: | P. nudula
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| Binomial name | |
| Prostanthera nudula | |
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| Occurrence data from AVH | |
Description
editProstanthera nudula is an erect to scrambling shrub that grows to a height of 0.5–2 mm (0.020–0.079 in) with branches that become rigid spines as they age. The leaves are narrow elliptic, 4–10.5 mm (0.16–0.41 in) long and 1.3–2.2 mm (0.051–0.087 in) wide on a petiole 0.3–0.8 mm (0.012–0.031 in) long. The flowers are arranged on pedicels 1.3–2.3 mm (0.051–0.091 in) long with bracteoles 1.5–2.4 mm (0.059–0.094 in) long near the base. The sepals are yellowish green, forming a tube 2.5–3.4 mm (0.098–0.134 in) long with two lobes, the lower lobe 3.3–4.7 mm (0.13–0.19 in) long and the upper lobe 5.2–8 mm (0.20–0.31 in) long. The petals are pale cream-coloured with yellow spots, 8–11 mm (0.31–0.43 in) long, the central lower lobe 3–3.5 mm (0.12–0.14 in) long and about 4 mm (0.16 in) wide. The lower lateral lobes are about 3 m (9.8 ft) long and 2 mm (0.079 in) wide and the upper lip is broadly egg-shaped, 4–4.5 mm (0.16–0.18 in) long and about 4.5 mm (0.18 in) wide. Flowering occurs from September to October.[3][4]
Taxonomy
editProstanthera nudula was first formally described in 1957 by Enid Lucy Robertson from an unpublished description by John McConnell Black. The description was published in the second edition of the Flora of South Australia from specimens collected by J.B. Cleland in the Everard Ranges in 1950.[5]
Distribution and habitat
editMount Illbillee mintbush grows amongst granite outcrops, usually near watercourse. It is relatively common in the Everard Ranges and is also found in the Musgrave Ranges.[3][6]
References
edit- ^ "Prostanthera nudula". Australian Plant Census. Retrieved 15 September 2020.
- ^ "Prostanthera nudula (Labiatae) Mount Illbillee Mintbush". South Australian Seed Conservation Service. Retrieved 15 September 2020.
- ^ a b "Prostanthera nudula". State Herbarium of South Australia. Retrieved 15 September 2020.
- ^ Conn, Barry J. (September 1988). "Prostantheras of South Australia" (PDF). Prostanthera and Westringia Study Group Newsletter. 14: 18–19. Retrieved 15 September 2020.
- ^ "Prostanthera nudula". Australian Plant Name Index. Retrieved 15 September 2020.
- ^ "Rare plants of the APY Lands Prostanthera nudula" (PDF). Government of South Australia. Retrieved 15 September 2020.