''Calothamnus roseus'' is a plant in the myrtle

family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...

Myrtaceae Myrtaceae, the myrtle family, is a family of dicotyledonous plants placed within the order Myrtales. Myrtle, pōhutukawa, bay rum tree, clove, guava, acca (feijoa), allspice, and eucalyptus are some notable members of this group. All spe ...

and is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found els ...

to the south-west of

Western Australia Western Australia (commonly abbreviated as WA) is a state of Australia occupying the western percent of the land area of Australia excluding external territories. It is bounded by the Indian Ocean to the north and west, the Southern Ocean to ...

. It is a shrub with needle-shaped, prickly leaves and pink flowers with four stamen bundles. (In 2014

Craven Craven may refer to: * Craven in the Domesday Book, an area of Yorkshire, England, larger area than the district ** Craven District, a local government district of North Yorkshire formed in 1974 Places * Craven, New South Wales, Australia, see ...

, Edwards and Cowley proposed that the species be renamed ''Melaleuca rosea''.)

Description

''Calothamnus roseus'' is a shrub growing to a height of about . Its leaves are needle-like, mostly long and wide, circular in cross section and tapering to a sharp, prickly point. The flowers have 4

sepal A sepal () is a part of the flower of angiosperms (flowering plants). Usually green, sepals typically function as protection for the flower in bud, and often as support for the petals when in bloom., p. 106 The term ''sepalum'' was coined ...

s and 4

petal Petals are modified leaves that surround the reproductive parts of flowers. They are often brightly colored or unusually shaped to attract pollinators. All of the petals of a flower are collectively known as the ''corolla''. Petals are usuall ...

s. The flower cup (the

hypanthium In angiosperms, a hypanthium or floral cup is a structure where basal portions of the calyx, the corolla, and the stamens form a cup-shaped tube. It is sometimes called a floral tube, a term that is also used for corolla tube and calyx tube. It ...

) and the sepals are hairy. The

stamen The stamen (plural ''stamina'' or ''stamens'') is the pollen-producing reproductive organ of a flower. Collectively the stamens form the androecium., p. 10 Morphology and terminology A stamen typically consists of a stalk called the filam ...

s are deep pink and are arranged in 4 claw-like bundles, each about long. The petals are long. Flowering occurs from September to November and is followed by fruits which are smooth, woody capsules, long.

Taxonomy and naming

''Calothamnus roseus'' was first formally described in 2010 by

Alex George Alexander or Alex George may refer to: * Alex George (botanist) (born 1939), Australian botanist *Alexander L. George (1920–2006), American political scientist *Alexander George (philosopher), American philosopher * Alex George (motorcyclist), Sc ...

Nuytsia ''Nuytsia floribunda'' is a hemiparasitic tree found in Western Australia. The species is known locally as moodjar and, more recently, the Christmas tree or Western Australian Christmas tree. The display of intensely bright flowers during the ...

from a specimen found near Ravensthorpe. The Latin ''roseus'' (rose-pink) refers to the colour of the stamens.

Distribution and habitat

''Calothamnus roseus'' occurs near Ravensthorpe in the

Esperance Plains Esperance Plains, also known as Eyre Botanical District, is a biogeographic region in southern Western Australia on the south coast between the Avon Wheatbelt and Hampton bioregions, and bordered to the north by the Mallee region. It is ...

biogeographic region An ecoregion (ecological region) or ecozone (ecological zone) is an ecologically and geographically defined area that is smaller than a bioregion, which in turn is smaller than a biogeographic realm. Ecoregions cover relatively large areas o ...

, where it grows in rocky soil derived from

quartzite Quartzite is a hard, non- foliated metamorphic rock which was originally pure quartz sandstone.Essentials of Geology, 3rd Edition, Stephen Marshak, p 182 Sandstone is converted into quartzite through heating and pressure usually related to tec ...

Conservation

''Calothamnus roseus'' is classified as "Priority One" by the Western Australian Government

Department of Parks and Wildlife The Department of Parks and Wildlife (DPaW) was the department of the Government of Western Australia responsible for managing lands described in the ''Conservation and Land Management Act 1984'' and implementing the state's conservation and en ...

, meaning that it is known from only one or a few locations which are potentially at risk.

References

{{Taxonbar, from=Q17590502

roseus Roseus is a Latin adjective meaning rose, rosy or pink. Species and cultivars * Roseus, a rosemary cultivar * Roseus or Pink Snow, an early crocus (''Crocus tommasinianus'') cultivar See also * Rosea (disambiguation) Rosea may refer to: * a La ...

Myrtales of Australia Plants described in 2010 Endemic flora of Western Australia