Strasburgeriaceae

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Strasburgeriaceae
Ixerba brexioides.jpg
Ixerba brexioides
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Crossosomatales
Family: Strasburgeriaceae
Tiegh. in Soler.
Genera
Synonyms

Ixerbaceae

Strasburgeriaceae is a small family of flowering plants in the order Crossosomatales, only found in New Zealand and New Caledonia. It contains two genera, Strasburgeria and Ixerba . Both genera have simple, evergreen, alternated leaves, often in worl-like clusters, with gland-tipped serrations, hermaphroditic, pentamerous flowers with persistent sepals, clawed petals, flat and long filaments that extend beyond the petals and a persistent style with a punctiform stigma. [1]

Contents

Fossil pollen named Bluffopollis scabratus, found in deposits from the Paleocene to the Miocene, is almost identical to the pollen of Strasburgeria, although only half its size. The fact that it was found in western and southern Australia and in New Zealand suggests that the most recent common ancestor of Strasburgeria and Ixerba had developed by the time of the break-up of East-Gondwana. [2]

Recent phylogenetic analysis resulted in the inclusion of the genus Ixerba (previously assigned to the monotypic family Ixerbaceae) in the Strasburgeriaceae. The following tree represents the most recent insights in the relationship between the Strasburgeriaceae and other families. [3]

Crossosomatales
family Strasburgeriaceae

Ixerba

Strasburgeria

Geissolomataceae

Aphloiaceae

Staphyleaceae

Guamatelaceae

Stachyuraceae

Crossosomataceae

While both Ixerba brexioides andStrasburgeria robusta share a base chromosome number of x = 25, I. brexioides is diploid (2n = 2x = 50), while S. robusta is icosaploid (2n = 20x = 500). The massive polyploidy in S. robusta may have furthered the adaptations that let it survive on the ultramafic substrates found in the montane forest of New Caledonia. [4]

Species

Related Research Articles

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Moraceae Family of flowering plants

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Ranunculaceae Family of eudicot flowering plants

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Bignoniaceae Family of flowering plants

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Myrtaceae Myrtle family of plants

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Annonaceae Family of flowering plants

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Hamamelidaceae Witch-hazel, a shrub or small tree

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Hydrocharitaceae Family of aquatic plants

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Zosteraceae Family of aquatic plants

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Polemoniaceae Family of flowering plants

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Altingiaceae Family of flowering plants in the order Saxifragales

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Chloranthaceae Family of flowering plants

Chloranthaceae is a family of flowering plants (angiosperms), the only family in the order Chloranthales. It is not closely related to any other family of flowering plants, and is among the early-diverging lineages in the angiosperms. They are woody or weakly woody plants occurring in Southeast Asia, the Pacific, Madagascar, Central and South America, and the West Indies. The family consists of four extant genera, totalling about 77 known species according to Christenhusz and Byng in 2016. Some species are used in traditional medicine. The type genus is Chloranthus. The fossil record of the family, mostly represented by pollen such as Clavatipollenites, extends back to the dawn of the history of flowering plants in the Early Cretaceous, and have been found on all continents.

<i>Didymeles</i> Genus of trees

Didymeles is a genus of flowering plants. It is variously treated as the only genus of the family Didymelaceae — or in the family Buxaceae, as in the APG IV system.

Haloragaceae Family of flowering plants in the Eudicot order Saxifragales

Haloragaceae is a eudicot flowering plant family in the order Saxifragales, based on the phylogenetic APG system. In the Cronquist system, it was included in the order Haloragales.

<i>Aphloia</i> Monotypic genus of flowering plants

Aphloia is a genus of flowering plants that contains a single species, Aphloia theiformis, the sole species of the monogeneric family Aphloiaceae. It is a species of evergreen shrubs or small trees occurring in East Africa, Madagascar, the Mascarene Islands and the Seychelles.

<i>Geissoloma</i> Monotypic genus of flowering plants native to the Cape Province of South Africa

Geissoloma is a genus of flowering plants in the monotypic family Geissolomataceae, native to the Cape Province of South Africa. The plants are xerophytic evergreen shrubs and are known to accumulate aluminum. It is sometimes called guyalone in English.

<i>Ixerba</i> Genus of trees

Ixerba brexioides, the sole species in the genus Ixerba, is a bushy tree with thick, narrow, serrated, dark green leaves and panicles of white flowers with a green heart. The fruit is a green capsule that splits open to reveal the black seeds partly covered with a fleshy scarlet aril against the white inside of the fruit. Ixerba is an endemic of the northern half of the North Island of New Zealand. Common names used in New Zealand are tawari for the tree and whakou when in flower. It is assigned to the family Strasburgeriaceae.

Strasburgeria robusta is an evergreen tree with large toothed leaves and large but rather inconspicuous, single, pendulant flowers in a gloomy colorscheme of yellowish with brown markings, with about ten sepals, five petals, ten stamens, a very distinct circular nectar gland with radiating spikes and rather large globular fruits with a long persistent style, with a scent reminiscent of apples, which is endemic to New Caledonia. It is the only recognized species of the genus Strasburgeria.

References

  1. Cameron, Kenneth M. (2002). "On the Phylogenetic Position of the New Caledonian Endemic Families Paracryphiaceae, Oncothecaceae, and Strasburgeriaceae: A Comparison of Molecules and Morphology". Botanical Review. Structural Botany in Systematics: A Symposium in Memory of William C. Dickison (Oct. - Dec., 2002). 68 (4): 428–443. doi:10.1663/0006-8101(2002)068[0428:otppot]2.0.co;2. JSTOR   4354432.
  2. Jarzen, D.M.; Pocknall, D.T. (1993). "Tertiary Bluffopollis scabratus (Couper) Pocknall & Mildenhall, 1984 and modern Strasburgeria pollen: a botanical comparison". New Zealand Journal of Botany. 31 (2): 185–192. doi: 10.1080/0028825x.1993.10419493 .
  3. Oh, S.H. (2010). "Phylogeny and systematics of Crossosomatales as inferred from chloroplast atpB, matK, and rbcL sequences". Korean Journal of Plant Taxonomy. 40 (4): 208–217.
  4. Oginuma, K.; Munzinger, J.; Tobe, H. (2006). "Exceedingly high chromosome number in Strasburgeriaceae, a monotypic family endemic to New Caledonia". Plant Systematics and Evolution. 262 (1–2): 97–101. doi:10.1007/s00606-006-0451-8.

External sources