Hypocalymma cordifolium is a species of flowering plant in the myrtle family Myrtaceae, and is endemic to the south west of Western Australia. It is usually an low-growing shrub, but is sometimes erect, with winged stems, heart-shaped leaves arranged in opposite pairs, white or pale pink flowers mostly arranged in pairs in leaf axils, and fruit containing pearly white or pale brown seeds.
| Hypocalymma cordifolium | |
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Myrtales |
| Family: | Myrtaceae |
| Genus: | Hypocalymma |
| Species: | H. cordifolium
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| Binomial name | |
| Hypocalymma cordifolium | |
Description
editHypocalymma cordifolium is usually a low-growing shrub that typically grows to a height of up to 0.2–2 m (7.9 in – 6 ft 6.7 in), but is sometimes an erect shrub up to 6 m (20 ft) high. Its young stems are prominently winged and sometimes deep red. Its leaves are heart-shaped, 6–19 mm (0.24–0.75 in) long, 9–18 mm (0.35–0.71 in) wide and sessile or on a petiole up to about 0.5 mm (0.020 in) long. The flowers are arranged in up to 16 leaf axils near the ends of branchlets, usually in groups of 2, sometimes singly or in groups of up to 4, on peduncles up to 1 mm (0.039 in) long. There are green or red-tinged bracteoles 1.3–2 mm (0.051–0.079 in) long at the base of the flowers. The sepals are broadly oblong to egg-shaped, 1.5–2.0 mm (0.059–0.079 in) long and 1.9–2.3 mm (0.075–0.091 in) wide and green or red-tinged. The petals are white or pale pink, 2.5–4.5 mm (0.098–0.177 in) long and there are 25 to 45 stamens with the filaments joined at the base. Flowering occurs all year with a peak between September and November and the fruit is a capsule 1.5–1.7 mm (0.059–0.067 in) long containing pearly white or pale brown sees 1.1–1.3 mm (0.043–0.051 in) long.[2][3][4][5]
Taxonomy
editHypocalymma cordifolium was first formally described in 1844 by Johannes Conrad Schauer from an unpublished manuscript by Johann Georg Christian Lehmann in Lehmann's Plantae Preissianae.[6][7] The specific epithet (cordifolium) means 'heart-leaved'.[8]
Distribution and habitat
editThis species of Hypocalymma is found in seasonally wet areas, along creek beds or swamps between Jarrahdale and Margaret River and east along the south coast to Cape Riche.[3][5]
References
edit- ^ "Hypocalymma cordifolium". Australian Plant Census. Retrieved 21 August 2024.
- ^ Strid, Arne; Keighery, Gregory J. (2003). "A taxonomic review of the genus Hypocalymma (Myrtaceae)". Nordic Journal of Botany. 22 (5): 565–568.
- ^ a b Rye, Barbara L.; Wilson, Peter G.; Keighery, Gregory J. (2013). "A revision of the species of Hypocalymma (Myrtaceae: Chamelaucieae) with smooth or colliculate seeds". Nuytsia. 23: 299–300. Retrieved 21 August 2024.
- ^ Rye, Barbara L.; Keighery, Gregory J. Wege, Juliet A.; Ely, C.J. (eds.). "Hypocalymma cordifolium". Flora of Australia. Australian Biological Resources Study, Department of Climate Change, Energy, the Environment and Water: Canberra. Retrieved 21 August 2024.
- ^ a b "Hypocalymma cordifolium". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
- ^ "Hypocalymma cordifolium". Australian Plant Name Index. Retrieved 21 August 2024.
- ^ Schauer, Johannes C. (1844). Lehmann, Johann G.C. (ed.). Plantae Preissianae. Vol. 1. Hamburg: Sumptibus Meissneri. pp. 112–113. Retrieved 21 August 2024.
- ^ Sharr, Francis Aubi; George, Alex (2019). Western Australian Plant Names and Their Meanings (3rd ed.). Kardinya, WA: Four Gables Press. p. 170. ISBN 9780958034180.