Callistemon Rigidus

''Melaleuca linearis'', commonly known as narrow-leaved bottlebrush, is a plant in the myrtle family, Myrtaceae and is endemic to New South Wales and Queensland in Australia. It is a medium-sized shrub with narrow leaves with a rigid point, and red flower spikes in late spring or early summer.

Description

''Melaleuca linearis'' is a shrub growing to tall with grey, hard, fibrous bark. Its leaves are arranged alternately and are long, wide, narrow linear in shape and flat to channelled or semi-circular in cross section. There is a mid-vein but the lateral veins are inconspicuous.

The flowers are a shade of red, rarely green and arranged in spikes on the ends of branches that continue to grow after flowering and also on the sides of the branches. The spikes are in diameter and long with 20 to 90 individual flowers. The petals are long and fall off as the flower ages and there are 23–73 stamens in each flower. Flowering occurs from late spring to early summer and is followed by fruits that are woody capsules, long.

Taxonomy and naming

''Melaleuca linearis'' was first formally described in 1796 by Heinrich Schrader and Johann Christoph Wendland in '' Sertum Hannoveranum''. The specific epithet (''linearis'') is a Latin word ''linearis'' meaning "linear" in reference to the shape of the leaves of this species.

In 2006, Craven described two varieties of ''Melaleuca linearis'' in the journal ''Novon'':
* ''Melaleuca linearis'' Schrad. & J.C.Wendl. var. ''linearis'' has leaves that are more than wide, usually 23–33 stamens per flower and occurs in Queensland south to the Coonabarabran and Narrabri districts in New South Wales and also in and between the Central Coast and Nowra districts in New South Wales.
* ''Melaleuca linearis'' var. ''pinifolia'' (J.C.Wendl.) Craven has leaves that are less than wide, 34–73 stamens per flower and occurs in the Gilgandra, Kandos and Sydney districts in New South Wales.

Synonymy

Plants of the World Online regards ''Callistemon linearis'' as a synonym of ''M. linearis'', ''C. pinifolius'' as a synonym of ''M. linearis'' var. ''acerosa'' (although this variety, named by Tausch has not been formally described) and ''C. rigidus'' as a synonym of ''M. linearis'' var. ''linearis''. It further considers ''M. linearis'' var. ''pinifolia'' to be a synonym of ''M. linearis'' var. ''acerosa''. However, the National Herbarium of New South Wales retains the names ''Callistemon linearis'', ''Callistemon pinifolius'' and ''Callistemon rigidus''.

The Australian Plant Census considers ''M. linearis'' to be a synonym of ''C. linearis'', ''M. linearis'' var. ''pinifolia'' a synonym of ''C. pinifolius'', and ''C. rigidus'' a synonym of ''C. linearis''.

A 2012 paper in the journal '' Muelleria'' suggested that if ''Callistemon'' were to be subsumed into ''Melaleuca'', there would be "no morphological characters to uniquely define it (''Melaluca'')". Indeed, in a 2014 paper in '' Taxon'', Craven and others proposed transferring '' Beaufortia'', ''Calothamnus'', ''Conothamnus'', '' Eremaea'', ''Lamarchea'', ''Phymatocarpus'' and '' Regelia'' to ''Melaleuca'', a change largely accepted by Plants of the World Online, but not by any Australian authority.

(Plants of the World Online considers ''Regelia'' to be a synonym of ''Verschaffeltia''.)

Distribution and habitat

''Melaleuca linearis'' occurs in and between the south-east corner of Queensland, Nowra on the south coast of New South Wales and inland as far as Gilgandra. It grows in damp situations in a range of vegetation associations.

Use in horticulture

''Melaleuca linearis'' has long been in cultivation (as ''Callistemon linearis'', ''C. pinifolius'' and ''C. rigidus''). Although not common in gardens, it is a hardy plant, thriving in most soils but preferring full sun. It is more resistant to pests such as sawfly than other melaleucas. It has received the Royal Horticultural Society's Award of Garden Merit.

References

External links

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{{Taxonbar, from1=Q50845569, from2=Q5022778

linearis
Flora of New South Wales
Plants described in 1796
Taxa named by Johann Christoph Wendland