Stachystemon

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Stachystemon
Stachystemon polyandrus - Flickr - Kevin Thiele.jpg
Stachystemon polyandrus
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malpighiales
Family: Picrodendraceae
Genus: Stachystemon
Planch. [1]
Synonyms [1]
  • Chorizotheca Müll.Arg.
  • Chrysostemon Klotzsch
  • Pseudanthus sect. CaletiopsisMüll.Arg.
  • Pseudanthus sect. Chrysostemon(Klotzsch) Müll.Arg.

Stachystemon is a genus of nine species of flowering plants in the family Picrodendraceae, and is endemic to Western Australia. Plants in the genus Stachystemon are monoecious shrubs with simple, usually thickened leaves, and flowers arranged singly or in small groups in upper leaf axils, male flowers usually with four to six tepals (sepals and petals together), usually with seven to many stamens, and female flowers with four or six tepals and two styles in each flower.

Contents

Description

Plants in the genus Stachystemon are monoecious shrubs with simple, usually thickened, petiolate leaves with stipules at the base. The flowers are arranged singly or in small groups in upper leaf axils, often forming clusters on the ends of branchlets with bracts at the base. Male flowers are usually arranged on a pedicel, and usually have four to six tepals in two whorls, each male flower with seven to many stamens fused in a central column. Female flowers are more or less sessile, usually with four or six tepals, each flower with two styles. The fruit is a capsule containing a single seed with a caruncle. [2] [3] [4]

Taxonomy

The genus Stachystemon was first formally described in 1845 by Jules Émile Planchon in the London Journal of Botany , and the first species he described (the type species) was Stachystemon vermicularis . [5] [6] The genus name (Stachystemon) is derived from Greek words meaning "ear of corn" or "spike", and "thread", referring to the joined stamens. [3]

Species list

The following is a list of species of Stachystemon accepted by the Australian Plant Census as of September 2023: [7]

Distribution

All species of Stachystemon are endemic to the south-west of Western Australia. [2] [3] [4]

See also

Related Research Articles

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<i>Micrantheum</i> Genus of flowering plants

Micrantheum is a genus of four species of flowering plant in the family Picrodendraceae and is endemic to Australia. Plants in the genus Micrantheum are heath-like, monoecious shrubs with simple leaves usually in groups of three, and flowers arranged singly or in small clusters in leaf axils, male flowers with three, six or nine stamens.

<i>Pseudanthus</i> Genus of flowering plants

Pseudanthus is a genus of nine species of flowering plants in the family Picrodendraceae, and is endemic to Australia. Plants in the genus Pseudanthus are small, heath-like, monoecious shrubs with simple, leathery leaves, and flowers arranged in upper leaf axils, male flowers usually with three or six stamens and female flowers with three styles.

<i>Ricinocarpos</i> Genus of flowering plants

Ricinocarpos is a genus of evergreen flowering plants in the family Euphorbiaceae and is endemic to Australia. Plants in the genus Ricinocarpos are monoecious shrubs with leaves arranged alternately along the branches, the edges curved downwards or rolled under. Male flowers are arranged singly or in racemes at the ends of branchlets, with four to six sepals that are fused at the base. There are four to six petals that are longer than the sepals, with many stamens fused to form a central column. Female flowers are arranged singly and are similar to male flowers but with three styles fused at the base and with a deeply branched tip. The fruit is a capsule containing seeds with an elaiosome.

<i>Pseudanthus pimeleoides</i> Species of shrub

Pseudanthus pimeleoides is a species of flowering plant in the family Picrodendraceae and is endemic to New South Wales. It is a monoecious shrub with crowded, linear to narrowly egg-shaped leaves and creamy white male flowers and inconspicuous female arranged singly in upper leaf axils, but appearing clustered on the ends of branches.

<i>Stachystemon polyandrus</i> Species of plant

Stachystemon polyandrus is a species of flowering plant in the family Picrodendraceae and is endemic to the southwest of Western Australia. It is a diffuse to straggling, monoecious shrub with crowded, oblong, elliptic or egg-shaped leaves with the narrower end towards the base, and small yellowish-white flowers arranged singly in upper leaf axils, but forming clusters at the ends of branches.

Pseudanthus ballingalliae is a species of flowering plant in the family Picrodendraceae and is endemic to Queensland. It is a monoecious shrub with simple, oblong to narrowly oblong leaves and small yellow male and green female flowers arranged singly in upper leaf axils, but appearing clustered on the ends of branches.

<i>Stachystemon axillaris</i> Species of shrub

Stachystemon axillaris, commonly known as leafy stachystemon, is a species of flowering plant in the family Picrodendraceae and is endemic to the south-west of Western Australia. It is a monoecious shrub with simple, linear to narrowly elliptic or oblong leaves and small yellow flowers arranged singly in upper leaf axils.

<i>Pseudanthus ligulatus</i> Species of shrub

Pseudanthus ligulatus is a species of flowering plant in the family Picrodendraceae and is endemic to northern Queensland. It is a monoecious shrub with simple, lance-shaped or linear to narrowly oblong leaves and creamy white male and pale green female flowers arranged singly in upper leaf axils, but appearing clustered on the ends of branches.

Pseudanthus micranthus, commonly known as fringed pseudanthus, is a species of flowering plant in the family Picrodendraceae and is endemic to the south-east of South Australia. It is a compact, monoecious shrub with simple, egg-shaped to round leaves and yellow flowers arranged in leaf axils, but appearing clustered on the ends of branches.

Stachystemon intricatus is a species of flowering plant in the family Picrodendraceae and is endemic to the south-west of Western Australia. It is a compact, densely-branched, monoecious shrub with crowded, elliptic or egg-shaped leaves and small, cup-shaped white flowers arranged singly in upper leaf axils.

<i>Pseudanthus orbicularis</i> Species of shrub

Pseudanthus orbicularis is a species of flowering plant in the family Picrodendraceae and is endemic to south-eastern continental Australia. It is a compact, monoecious shrub with simple, broadly elliptic to round leaves and creamy white, red or pale red flowers arranged singly in upper leaf axils.

Stachystemon mucronatus is a species of flowering plant in the family Picrodendraceae and is endemic to the south-west of Western Australia. It is a compact, monoecious shrub with narrowly oblong or narrowly elliptic leaves and small, greenish yellow flowers arranged singly in upper leaf axils.

<i>Pseudanthus orientalis</i> Species of shrub

Pseudanthus orientalis is a species of flowering plant in the family Picrodendraceae and is endemic to the coast of eastern Australia. It is a compact, rigid, monoecious shrub with simple, linear to narrowly oblong leaves and yellow to creamy-white flowers arranged singly in upper leaf axils, but often appearing clustered on the ends of branches.

Stachystemon nematophorus is a species of flowering plant in the family Picrodendraceae and is endemic to the Kalbarri National Park in Western Australia. It is a woody, dense, compact, monoecious shrub with simple, oblong, elliptic or egg-shaped leaves with the narrower end towards the base, and small yellowish flowers arranged singly in upper leaf axils, but forming clusters at the ends of branches.

<i>Pseudanthus ovalifolius</i> Species of shrub

Pseudanthus ovalifolius, commonly known as oval-leaf pseudanthus, is a species of flowering plant in the family Picrodendraceae and is endemic to south-eastern Australia. It is a spreading to compact, wiry, monoecious shrub with oval leaves and whitish flowers arranged singly in upper leaf axils, but sometimes appearing clustered on the ends of branches.

Pseudanthus pauciflorus is a species of flowering plant in the family Picrodendraceae and is endemic to eastern Australia. It is a compact, monoecious shrub with simple, lance-shaped or narrowly elliptic to narrowly oblong leaves and creamy white flowers arranged singly in upper leaf axils, but appearing clustered on the ends of branches.

Stachystemon vermicularis is a species of flowering plant in the family Picrodendraceae and is endemic to the southwest of Western Australia. It is a diffuse, monoecious shrub with linear leaves and small red male flowers and yellowish female flowers arranged singly in upper leaf axils, but forming clusters at the ends of branches.

Stachystemon vinosus is a species of flowering plant in the family Picrodendraceae and is endemic to the southwest of Western Australia. It is a compact, monoecious shrub with narrowly egg-shaped or narrowly oblong leaves and maroon to purplish red and white male flowers and white female flowers arranged singly in upper leaf axils, but forming clusters at the ends of branches.

Stachystemon virgatus is a species of flowering plant in the family Picrodendraceae and is endemic to the southwest of Western Australia. It is a compact monoecious shrub with elliptic or narrowly oblong leaves and small yellow flowers arranged singly in upper leaf axils.

References

  1. 1 2 "Stachystemon". Australian Plant Census. Retrieved 4 September 2023.
  2. 1 2 Halford, David A.; Henderson, Rodney J.F. (2003). "Studies in Euphorbiaceae A.L.Juss. sens. lat. 5. A revision of Pseudanthus Sieber ex Spreng. and Stachystemon Planch. (Oldfieldioideae Kohler & Webster, Caletieae Mull.Arg.)". Austrobaileya. 6 (3): 515–516. Retrieved 4 September 2023.
  3. 1 2 3 "Stachystemon". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 4 September 2023.
  4. 1 2 "Stachystemon". FloraBase . Western Australian Government Department of Biodiversity, Conservation and Attractions.
  5. "Stachystemon". APNI. Retrieved 4 September 2023.
  6. Planchon, Jules E. (1845). Hooker, William J. (ed.). "Description de deux genres nouveaux de la famille des Euphorbiacees". London Journal of Botany. 4: 471–472. Retrieved 4 September 2023.
  7. "Stachystemon". Austrlian Plant Census. Retrieved 4 September 2023.