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Alloxylon pinnatum
''Alloxylon pinnatum'', commonly known as Dorrigo waratah, is a tree of the family Proteaceae found in warm-temperate rainforest of south-east Queensland and northern New South Wales in eastern Australia. It has shiny green leaves that are either pinnate and up to long, or lanceolate (spear-shaped) and up to long. The prominent pinkish-red flower heads, known as inflorescences, appear in spring and summer; these are made up of 50 to 140 individual flowers arranged in corymb or raceme. These are followed by rectangular woody seed pods, which bear two rows of winged seeds.
Previously known as ''Oreocallis pinnata'' for many years, it was transferred to the new genus ''Alloxylon'' by Peter Weston and Mike Crisp in 1991. This genus contains the four species previously classified in ''Oreocallis'' that are found in Australasia. Its terminal tubular flowers indicate that the species is pollinated by birds. Classified as ''near threatened'' under the Queensland Nature Conservation Act 1992, ''Alloxylon pinnatum'' has proven difficult to keep alive in cultivation.
==Description==
The Dorrigo waratah is a rainforest tree that reaches high and a has non-buttressed trunk of diameter at breast height (dbh). The bark is greyish brown and covered in many small pimples, rendering it sandpaper-like in texture.〔 The green foliage consists of several distinct juvenile and adult leaf forms, which are arranged alternately along the stems. Juvenile leaves are light green and at first simple, with a single blade. Successive leaves on more mature plants become more complex, or pinnate, with deep 'pinnae' (lobes); these leaves are are up to long with 2–11 leaflets.〔 Some adult leaves are simple—with a single lanceolate leaf blade—and up to long;〔 these are generally located near the flower heads.〔 Among the green foliage there are occasional yellow leaves. New branchlets and leaves are covered in brown hair.
The pinkish-red compound flowerheads, known as inflorescences, are up to 20 cm (8 cm) across in spring to summer, and contain between 50 and 140 smaller flowers, arranged in a corymb or raceme. These individual flowers are long〔 and sit atop stalks (known as pedicels) up to in length, which arise in pairs off the main stalk within the inflorescence. Each flower consists of a tubular perianth, which partly splits along one side at anthesis to release the thick style. The stigma is contained within a slanting disc-like structure at the tip of the style. The tubular perianth splits into four segments at its tip, and the anther lies in the concave parts within each of these segments.〔 The flower parts are glabrous (smooth).〔 The pollen is crimson. After flowering, the long woody seedpod develops. Cylindrical in shape, it splits down one side to release the seed, which are ripe from February to June. The seeds are arranged in two rows,〔 with at least four seeds in each row. Each seed is separated from the others by a membranous separator, and has a long rectangular wing, which is much longer than the seed itself.〔 ''Alloxylon pinnatum'' can be distinguished from other members of the genus ''Alloxylon'' by its pinnate adult leaves. This feature serves to differentiate it as other species in the genus have simple adult leaves. The other species have inflorescences with fewer flowers (50 maximum), and have yellow pollen.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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