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Banksia subg. Isostylis
''Banksia'' subg. ''Isostylis'' is a subgenus of ''Banksia''. It contains three closely related species, all of which occur only in Southwest Western Australia. Members of subgenus ''Isostylis'' have dome-shaped flower heads that are superficially similar to those of ''B.'' ser. ''Dryandra'', but structurally more like reduced versions of the "flower spikes" characteristic of most other ''Banksia'' taxa.
There are three species of ''Banksia'' subg. ''Isostylis'', ''B. ilicifolia'' (Holly-leaved Banksia), ''B. cuneata'' (Matchstick Banksia) and ''B. oligantha'' (Wagin Banksia). ''B. ilicifolia'' is widely distributed and relatively common, but the other two species are rare and threatened.
==Description==
''B.'' subg. ''Isostylis'' shares with ''B.'' ser. ''Dryandra'' the property of having compact, dome-shaped flower heads. Structurally, however, ''Isostylis'' flower heads are quite different from those of ''B.'' ser. ''Dryandra'', having more in common with the erect flower spikes of other ''Banksia'' taxa. Specifically, ''Isostylis'' flower heads have an ovoid axis, suggestive of a greatly reduced flower spike, whereas ''Dryandra'' flower heads emerge from a flat receptable. Furthermore, ''Isostylis'' has thick follicles with a woolly coating, whereas ''Dryandra'' follicles are thin and hairless; and the involucral, common and floral bracts of ''Isostylis'' are unlike those of ''Dryandra''.
The ''Isostylis'' species are all upright shrubs or trees, with a single trunk. They generally have serrate leaves, although in rare cases ''B. ilicifolia'' may have entire leaves.
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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