''Calothamnus robustus'' 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 an erect shrub with cylindrical leaves and small clusters of red flowers in spring, followed by fruits with have two prominent lobes.

Description

''Calothamnus robustus'' is a compact, erect shrub growing to about tall. Its leaves are circular in cross section but are not prickly. The flowers are red and arranged in clusters of 3 to 5. Unlike some others in the genus, the flowers and fruit are never buried in corky bark. 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 which are densely hairy on their outer surface. There are 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 and the stamens are joined in 4 narrow, claw-like bundles which are all roughly the same length. Flowering occurs mainly from September to November, sometimes in other months and is followed by fruits which are woody

capsule Capsule may refer to: Anatomy * Articular capsule (joint capsule), an envelope surrounding a synovial joint * Bowman's capsule (glomerular capsule), a sac surrounding a glomerulus in a mammalian kidney * Glisson's capsule, a fibrous layer covering ...

s. The fruiting capsules have two prominently thickened lobes.

Taxonomy and naming

''Calothamnus robustus'' was first formally described by

Johannes Schauer Johannes is a Medieval Latin form of the personal name that usually appears as " John" in English language contexts. It is a variant of the Greek and Classical Latin variants (Ιωάννης, '' Ioannes''), itself derived from the Hebrew name '' ...

in 1843 in from a specimen collected in the foothills of Mount Melville near

Cape Riche Cape Riche is a cape and rural locality in the Great Southern region of Western Australia. By road, it is 525 km south-east of Perth and 123 km north-east of Albany Facilities in the locality include a boat launching ramp and a ca ...

. The

specific epithet In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...

is a Latin word meaning "hard and strong like oak".

Distribution and habitat

''Calothamnus robustus'' occurs near Albany 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 growing in rocky soils 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 ...

granite Granite () is a coarse-grained ( phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies und ...

Conservation

''Calothamnus robustus'' is classified as "Priority Three" by the Western Australian government department of parks and wildlife meaning that it is poorly known and known from only a few locations but is not under imminent threat.

References

{{Taxonbar, from=Q15395385 robustus Myrtales of Australia Plants described in 1843 Endemic flora of Western Australia