Stachystemon nematophorus

Last updated

Stachystemon nematophorus
Status DECF P4.svg
Priority Four — Rare Taxa (DEC)
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malpighiales
Family: Picrodendraceae
Genus: Stachystemon
Species:
S. nematophorus
Binomial name
Stachystemon nematophorus
Synonyms [1]

Pseudanthus nematophorusF.Muell.

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.

Contents

Description

Stachystemon nematophorus is a woody, dense, compact, monoecious shrub that typically grows to a height of up to 10 cm (3.9 in) and has glabrous branchlets. Its leaves are arranged in opposite pairs, evenly spaced along the branchlets and glabrous. The leaves are oblong, elliptic or egg-shaped with the narrower end towards the base, 4–15 mm (0.16–0.59 in) long and 0.9–1.5 mm (0.035–0.059 in) wide on a petiole 0.6–0.8 mm (0.024–0.031 in), with pale brown, narrowly triangular stipules 0.7–1.2 mm (0.028–0.047 in) long at the base. Both sides of the leaves are more or less glabrous. The flowers are arranged singly in upper leaf axils forming clusters on the ends of branches with reddish brown, bract-like leaves and two bracteoles at the base. Male flowers are more or less sessile with six dissimilar yellowish tepals, the outer three 0.5–0.9 mm (0.020–0.035 in) long and 0.6–0.8 mm (0.024–0.031 in) wide, two of the inner three slightly shorter and one much longer and thread-like. There are 12 to 16 stamens, the anthers purplish red or brown. Female flowers are sessile and have 6 tepals 0.6–1.2 mm (0.024–0.047 in) long, 0.2–1.5 mm (0.0079–0.0591 in) wide and keeled. Flowering hs been observed in May, and the fruit is an oval capsule 5–7 mm (0.20–0.28 in) long and 2–3 mm (0.079–0.118 in) in diameter. [2] [3] [4]

Taxonomy and naming

This species was first formally described in 1860 by Ferdinand von Mueller who gave it the name Pseudanthus nematophorus in Fragmenta Phytographiae Australiae from specimens collected near the Murchison River by Augustus Oldfield. [5] [6] In 2003, David Halford and Rodney Francis trnsferred the species to Stachystemon as S. nematophorus in the journal Austrobaileya . [3] [7] The specific epithet (nematophorus) means "bearing a thread", referring to one of the male tepals that is longer than the others and thread-like. [8]

Distribution and habitat

This stachystemon grows in rock crevices in shrubland in Kalbarri National Park in the Geraldton Sandplains bioregion of south-western Western Australia. [2] [3] [4]

Conservation status

Stachystemon nematophorus is classified as "Priority Four" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions, [2] meaning that it is rare or near threatened. [9]

Related Research Articles

Patersonia maxwellii is a species of flowering plant in the iris family Iridaceae and is endemic to the south of Western Australia. It is a tufted, rhizome-forming perennial herb with linear leaves and violet tepals.

<i>Stachystemon</i>

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, usually with seven to many stamens, and female flowers with four or six tepals and two styles in each flower.

Persoonia brachystylis is a species of flowering plant in the family Proteaceae and is endemic to a restricted area on the west coast of Western Australia. It is an erect, spreading shrub with smooth bark, narrow spatula-shaped to lance-shaped leaves and yellow flowers in groups of ten to twenty.

<i>Allocasuarina corniculata</i> Species of flowering plant

Allocasuarina corniculata is a species of flowering plant in the family Casuarinaceae and is endemic to the south-west of Western Australia. It is an erect to spreading, dioecious shrub that has more or less erect branchlets, the leaves reduced to scales in whorls of six to eleven, the mature fruiting cones 8–15 mm (0.31–0.59 in) long containing winged seeds (samaras) 3–4 mm (0.12–0.16 in) long.

<i>Allocasuarina grevilleoides</i> Species of flowering plant

Allocasuarina grevilleoides is a species of flowering plant in the family Casuarinaceae and is endemic to the south-west of Western Australia. It is a small, spreading, dioecious shrub that forms a lignotuber, and has more or less erect, sharply-pointed branchlets, the leaves reduced to scales in whorls of four, the mature fruiting cones 9–14 mm (0.35–0.55 in) long containing winged seeds (samaras) 5.5–7.0 mm (0.22–0.28 in) long.

<i>Grevillea trachytheca</i> Species of shrub in the family Proteaceae endemic to Western Australia

Grevillea trachytheca, commonly known as rough-fruit grevillea, is a species of flowering plant in the family Proteaceae and is endemic to the south-west of Western Australia. It is an erect to spreading shrub with hairy branchlets, mostly broadly linear leaves, and white to cream-coloured and yellow flowers with a white style.

<i>Boronia nematophylla</i> Species of flowering plant

Boronia nematophylla is a plant in the citrus family Rutaceae and is endemic to the south-west of Western Australia. It is a shrub with thin, simple leaves and pale red to purple, four-petalled flowers arranged singly or in small groups in leaf axils.

Lechenaultia chlorantha, commonly known as Kalbarri leschenaultia, is a species of flowering plant in the family Goodeniaceae and is endemic to a restricted area near Kalbarri in Western Australia. It is a subshrub or shrub with many branches, crowded, narrow, fleshy leaves and pale bluish-green, tube-shaped flowers.

<i>Cryptandra longistaminea</i> Species of flowering plant

Cryptandra longistaminea is a species of flowering plant in the family Rhamnaceae and is endemic to eastern Australia. It is a shrub with many branches, egg-shaped or elliptic to linear leaves, and clusters of white, tube-shaped flowers.

<i>Ricinocarpos bowmanii</i> Species of shrub

Ricinocarpos bowmanii, commonly known as western wedding bush or Bowman jasmine, is a species of flowering plant in the family Euphorbiaceae and is endemic to New South Wales. It is usually a monoecious shrub with linear to oblong leaves and three to six male flowers around each female flower.

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.

Stachystemon brachyphyllus 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, narrowly elliptic to elliptic or oblong leaves and small yellow, red, purple and brown flowers arranged singly in upper leaf axils.

Ricinocarpos oliganthus is a species of flowering plant in the family Euphorbiaceae and is endemic to a small area in the south-west of Western Australia. It is a monoecious shrub with linear to narrowly oblong leaves and white to creamy white flowers arranged singly on the ends of branchlets.

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.

References

  1. 1 2 "Stachystemon nematophorus". Australian Plant Census. Retrieved 22 September 2023.
  2. 1 2 3 "Stachystemon nematophorus". FloraBase . Western Australian Government Department of Biodiversity, Conservation and Attractions.
  3. 1 2 3 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): 522–523. Retrieved 22 September 2023.
  4. 1 2 "Stachystemon nematophorus". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 22 September 2023.
  5. ↑ "Pseudanthus nematophorus". Australian Plant Name Index. Retrieved 11 September 2023.
  6. ↑ von Mueller, Ferdinand (1860). Fragmenta Phytographiae Australiae. Vol. 2. Melbourne: Victorian Government Printer. p. 14. Retrieved 22 September 2023.
  7. ↑ "Stachystemon nematophorus". Australian Plant Name Index. Retrieved 22 September 2023.
  8. ↑ Sharr, Francis Aubi; George, Alex (2019). Western Australian Plant Names and Their Meanings (3rd ed.). Kardinya, WA: Four Gables Press. p. 149. ISBN   9780958034180.
  9. ↑ "Conservation codes for Western Australian Flora and Fauna" (PDF). Government of Western Australia Biodiversity, Conservation and Attractions. Retrieved 22 September 2023.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.