''Thryptomene caduca'' is a species of flowering plant in the family

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 ...

and is

endemic Endemism is the state of a species being found only 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 foun ...

to a small area in the north-west of Western Australia. It is a spreading shrub with crowded egg-shaped leaves with the narrower end towards the base, and pink flowers with five petals and seven to nine

stamen The stamen (: stamina or stamens) is a part consisting of the male reproductive organs of a flower. Collectively, the stamens form the androecium., p. 10 Morphology and terminology A stamen typically consists of a stalk called the filament ...

Description

''Thryptomene caduca'' is a spreading shrub that typically grows to high and about wide. Its leaves are crowded on the branchlets, pointing upwards and egg-shaped to more or less round, long and wide on a

petiole Petiole may refer to: *Petiole (botany), the stalk of a leaf, attaching the blade to the stem *Petiole (insect anatomy) In entomology, petiole is the technical term for the narrow waist of some hymenopteran insects, especially ants, bees, and ...

less than long. The flowers are arranged

raceme A raceme () or racemoid is an unbranched, indeterminate growth, indeterminate type of inflorescence bearing flowers having short floral stalks along the shoots that bear the flowers. The oldest flowers grow close to the base and new flowers are ...

-like in groups of two to six on a peduncle long with egg-shaped bracteoles long that fall from the flower buds. The flowers are in diameter with egg-shaped to heart-shaped, pink

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 Etymology The term ''sepalum'' ...

s usually long and keeled. The petals are pink, long and there are seven to nine stamens. Flowering mainly occurs from July to September.

Taxonomy

''Thryptomene caduca'' was first formally described in 2014 by

Barbara Lynette Rye Barbara Lynette Rye is an Australian botanist born in 1952. Barbara Rye has been associated with the Western Australian Herbarium, where her work as a taxonomist has been the source of many new descriptions of plants. The number of taxa recorded ...

and Malcolm Eric Trudgen in the journal ''

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 specimens collected by G.J. Keighery and N. Gibson in 1996. The

specific epithet In Taxonomy (biology), taxonomy, binomial nomenclature ("two-term naming system"), also called binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, both of which use Latin gramm ...

(''caduca'') means "dropping off early", referring to the bracteoles.

Distribution and habitat

The shrub grows in sandy places including coastal sand dunes and is found from near Tamala Station to near Hamelin Pool and Kalbarri, often with ''

Banksia ''Banksia'' is a genus of around 170 species of flowering plants in the family Proteaceae. These Australian wildflowers and popular garden plants are easily recognised by their characteristic flower spikes, and woody fruiting "cones" and head ...

'' or ''

Eucalyptus ''Eucalyptus'' () is a genus of more than 700 species of flowering plants in the family Myrtaceae. Most species of ''Eucalyptus'' are trees, often Mallee (habit), mallees, and a few are shrubs. Along with several other genera in the tribe Eucalyp ...

'' species.

Conservation status

''Thryptomene caduca'' is classified as " Priority Two" 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 poorly known and from only one or a few locations.

References

{{Taxonbar, from=Q30687128 caduca Endemic flora of Western Australia Rosids of Western Australia Plants described in 2014 Taxa named by Barbara Lynette Rye Taxa named by Malcolm Eric Trudgen