|Banksia petiolaris subsp. var.|
Banksia petiolaris is a species of shrub of the genus Banksia in the Proteaceae family. It is a prostrate banksia, a group of several closely related species all with horizontal stems and thick, leathery upright leaves. No varieties have been subsequently described. It bears yellow inflorescences in spring. It is found in sandy soils in the south coastal regions of Western Australia in the vicinity of Esperance. It is nonlignotuberous, regenerating by seed after bushfire. Banksia petiolaris adapts readily to cultivation, and is suitable for rockeries and as a groundcover.
Banksia petiolaris is a prostrate shrub which can spread to a diameter of 2 metres (7 ft), its thick stems grow horizontally on the ground and are covered in fine hair. The new growth is more densely covered with velvety orange brown hair. The large leathery upright leaves arise vertically on petioles up to 15 cm (6 in) high. The adaxial surface faces north and is inclined at around 15 degrees off vertical. The leaf laminae can reach 60 cm (24 in) in length and 4 cm (1.6 in) wide. They are dull green with serrated margins and a white undersurface. Dead leaves remain on the plant. Flowering occurs in late spring. The cylindrical inflorescences are yellow in overall colour and range from 9 to 16 cm (3.6–6.2 in) high. As the flower spikes age, they fade to a greyish colour, the old flowers persisting. Up to 20 follicles may appear on each spike. Covered with a fine grey fur, they are elliptical in shape and measure 2.8–3.8 cm (1.1–1.7 in) in length, and 1.5–2 cm (0.6–0.8 in) in width.
It is nonlignotuberous, regenerating by seed after bushfire.
Requires a well drained soil, preferably fairly sandy. Like other banksias, it grows best in full sun. It makes an attractive prostrate groundcover, and can be used in embankments and to reduce soil erosion, as well as rockeries. It is tolerant of alkaline soils, with one cultivated specimen recorded tolerating a pH of 9.5.
Pests and diseases
Although somewhat resistant to dieback, it does require a well drained soil, preferably fairly sandy.
- ↑ 1.0 1.1 Witkowski, E.T.F.; Lamont, Byron B.; Walton Craig S.; Radford, Sue (1992). "Leaf Demography, Sclerophylly and Ecophysiology of Two Banksias With Contrasting Leaf Life Spans". Australian Journal of Botany 40 (6): 849–62. doi:10.1071/BT9920849.
- ↑ Template:Cite encyclopedia
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- ↑ Sweedman, Luke; et al. (2006). Australian seeds: a guide to their collection, identification and biology. CSIRO Publishing. p. 203. ISBN 0643092986.