Banksia plagiocarpa
| Dallachy's Banksia | |
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Rare (NCA)
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| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| Order: | Proteales |
| Family: | Proteaceae |
| Genus: | Banksia |
| Species: | B. plagiocarpa |
| Binomial name | |
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Banksia plagiocarpa A.S.George |
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Banksia plagiocarpa, commonly known as the Dallachy's banksia or blue banksia, is a species of shrub or tree in the plant genus Banksia. It occurs only on Hinchinbrook Island, Queensland and the immediately adjacent mainland. First collected in 1867, Banksia plagiocarpa was not described until 1981, when Alex George named it in his monograph of the genus Banksia. Genetic studies show it to be related to Banksia aquilonia, Banksia oblongifolia and Banksia robur.
Banksia plagiocarpa grows as a shrub to 5 m (16 ft) high with greyish broken bark. The new growth is covered in red velvety fur, which falls off after two or three years. The long narrow lanceolate (spear-shaped) to obovate leaves are arranged alternately along the stems. Measuring 8 to 20 cm (3.1 to 7.9 in) long by 0.6–1.7 cm (0.24–0.67 in) wide, they have recurved margins lined with blunt serrations. Appearing from February to July, the flower spikes, known as inflorescences, are 7 to 14 cm (2.8 to 5.5 in) high and 5–6 cm (2.0–2.4 in) in diameter at anthesis. Arising terminally or from one- to two-year-old branches, they are often surrounded at the base by a whorl of small branchlets.
Banksia plagiocarpa was first collected on 20 December 1867 and 21 February 1868 by John Dallachy (a collector for Victorian Government Botanist Ferdinand von Mueller) from Bishops Peak in the Cardwell Ranges, the specimens lodged at Kew and Melbourne Herbariums. However, it was not collected again until 28 December 1979 by Fred Hockings from Hinchinbrook Island. Both Dallachy and Hockings remarked on the unusual flower colour, the former describing it as "pale blue", the latter "greenish-purple". It was finally described in Alex George's 1981 revision of the genus. The species name is derived from the Ancient Greek words plagios "sloping" or "oblique", and carpos "fruit", and refers to the upturned wedge-shaped follicles. Common names include Dallachy's banksia and blue banksia.
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Wikipedia