|
''Banksia lemanniana'', commonly known as the yellow lantern banksia or Lemann's banksia, is a species of woody shrub of the family Proteaceae native to Western Australia. It generally grows as an open shrub or small tree to five metres (15 ft) high with stiff serrated leaves, and unusual hanging inflorescences. Flowering occurs over summer, the greenish buds developing into oval flower spikes before turning grey and developing the characteristic large woody follicles. It occurs within and just east of the Fitzgerald River National Park on the southern coast of the state. ''Banksia lemanniana'' is killed by bushfire and regenerates from seed. First described by Swiss botanist Carl Meissner in 1856, it was named in honour of English botanist Charles Morgan Lemann. It is one of three or four related species all with pendent inflorescences, which is an unusual feature within the genus. No subspecies are recognised. ''Banksia lemanniana'' is classified as Not Threatened under the Wildlife Conservation Act of Western Australia. Unlike many Western Australian banksias, it appears to have some resistance to dieback from the soil-borne water mould ''Phytophthora cinnamomi'', and is one of the easier Western Australian species to grow in cultivation. ==Description== ''Banksia lemanniana'' grows as an open shrub or, less commonly, a small tree to 5 m (15 ft) in height, with a spreading habit. The trunk has thin grey bark and can reach a diameter of 15 cm (6 in). Lower-growing plants that reach in height have been reported from coastal areas of Fitzgerald River National Park.〔 The new growth is finely hairy and predominantly seen in summer,〔 pp. 142–43.〕 before losing its hair and becoming glabrous (smooth) over two years. The stiff leaves are narrowly wedge-shaped or more oval (cuneate to obovate) and measure 3 to 9 cm (1.2–3.6 in) in length by 1.2–3.5 cm (0.5–1.5 in) wide. The leaf margins are serrated, with many teeth measuring 0.1 to 0.3 cm each.〔 Flowering typically occurs between October and January. Unlike those of most other banksias, the cylindrical inflorescences hang down from branchlets and measure 5–11 cm (2–4.4 in) in length and in diameter. They are green-yellow in colour and smell of honey, and drip large amounts of nectar. The buds are a rich chocolate brown in colour until the yellow flowers push through. The inflorescences turn grey as they age, and the old flowers remain as up to 20 large woody follicles develop. Oval in shape, wrinkled in texture and covered with fine hair, they can reach 4.5 cm (1.8 in) long, 3 cm (1.2 in) high, and 3 cm (1.2 in) wide. The obovate seed is long and fairly flattened, and is composed of the wedge-shaped seed body proper, measuring long and wide, and a papery wing. One side, termed the outer surface, is dark brown and wrinkled, while the other is black and smooth. Both surfaces sparkle slightly. The seeds are separated by a sturdy dark brown seed separator that is roughly the same shape as the seeds with a depression where the seed body sits adjacent to it in the follicle. Seedlings have cuneate (wedge-shaped) cotyledons which measure long and wide. These are dull green, sometimes with a reddish tinge, and the margin of the wedge may be crenulated (lined with small teeth). The hypocotyl is red and measures 1–2 cm (0.4–0.8 in) high and 0.25–0.3 cm (0.1 in) wide.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Banksia lemanniana」の詳細全文を読む スポンサード リンク
|