Santalales

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Santalales
Starr 041006-0222 Santalum haleakalae.jpg
Santalum haleakalae
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Superasterids
Order: Santalales
R.Br. ex Bercht. & J.Presl [1]
Families

See text

Synonyms

Balanophorales

The Santalales are an order of flowering plants with a cosmopolitan distribution, but heavily concentrated in tropical and subtropical regions. It derives its name from its type genus Santalum (sandalwood). Mistletoe is the common name for a number of parasitic plants within the order.

Contents

Overview

Many of the members of the order are parasitic plants, mostly hemiparasites, able to produce sugars through photosynthesis, but tapping the stems or roots of other plants to obtain water and minerals; some (e.g. Arceuthobium ) are obligate parasites, have low concentrations of chlorophyll within their shoots (1/5 to 1/10 of that found in their host's foliage), and derive the majority of their sustenance from their hosts' vascular tissues (water, micro- and macronutrients, and sucrose).

Most have seeds without testae (seed coats), which is unusual for flowering plants.

Classification

The APG IV system of 2016 includes seven families. [2] As in the earlier APG III system, it was accepted that Olacaceae sensu lato was paraphyletic but new family limits were not proposed as relationships were considered uncertain. [3] [2] As of July 2021, this seven-family division of the Santalales was explicitly accepted by the World Flora Online, [1] and implicitly by Plants of the World Online, in that it accepted none of the extra families recognized by other sources. The seven families are:

When only these families are recognized, one possible phylogenetic relationship among them is shown below. Support for some of the nodes is weak, [4] and at least two families, Olacaceae s.l. and Balanophoraceae s.l., are not monophyletic: [4] [5]

Santalales

Olacaceae s.l.

Balanophoraceae s.l.

Loranthaceae

Misodendraceae

Schoepfiaceae

Opiliaceae

Santalaceae s.l.

A summary of the circumscription and phylogeny of the Santalales published in 2020 used 20 rather than seven families. Olacaceae s.l. was divided into seven families, Balanophoraceae s.l. was divided into two, and Santalaceae s.l. into seven. [5] As of July 2021, the Angiosperm Phylogeny Website accepted the families resulting from the division of Olacaceae s.l. and Balanophoraceae s.l. but not those from the division of Santalaceae s.l. [4]

Division of the sensu lato Santalales families according to Nickrent (2020) [5]
  • Olacaceae s.l.
    • Aptandraceae
    • Coulaceae
    • Erythropalaceae
    • Octoknemaceae
    • Olacaceae s.s.
    • Strombosiaceae
    • Ximeniaceae
  • Balanophoraceae s.l.
    • Balanophoraceae s.s.
    • Mystropetalaceae
  • Santalaceae s.l.
    • Amphorogynaceae
    • Cervantesiaceae
    • Comandraceae
    • Nanodeaceae
    • Santalaceae s.s.
    • Thesiaceae
    • Viscaceae

Earlier systems

In the classification system of Dahlgren, the Santalales were in the superorder Santaliflorae (also called Santalanae). The Cronquist system (1981) used this circumscription: [6]

Related Research Articles

<span class="mw-page-title-main">Fabales</span> Order of flowering plants in the dicots

Fabales is an order of flowering plants included in the rosid group of the eudicots in the Angiosperm Phylogeny Group II classification system. In the APG II circumscription, this order includes the families Fabaceae or legumes, Quillajaceae, Polygalaceae or milkworts, and Surianaceae. Under the Cronquist system and some other plant classification systems, the order Fabales contains only the family Fabaceae. In the classification system of Dahlgren the Fabales were in the superorder Fabiflorae with three families corresponding to the subfamilies of Fabaceae in APG II. The other families treated in the Fabales by the APG II classification were placed in separate orders by Cronquist, the Polygalaceae within its own order, the Polygalales, and the Quillajaceae and Surianaceae within the Rosales.

<span class="mw-page-title-main">Laurales</span> Order of flowering plants

The Laurales are an order of flowering plants. They are magnoliids, related to the Magnoliales.

<span class="mw-page-title-main">Magnoliales</span> Basal order of flowering plants

The Magnoliales are an order of flowering plants.

<span class="mw-page-title-main">Rosidae</span>

Under the International Code of Nomenclature for algae, fungi, and plants (ICN), Rosidae is a botanical name at the rank of subclass. Circumscription of the subclass will vary with the taxonomic system being used; the only requirement being that it includes the family Rosaceae.

<span class="mw-page-title-main">Viscaceae</span> Family of flowering plants

Viscaceae is a taxonomic family name of flowering plants. In this circumscription, the family includes the several genera of mistletoes. This family name is currently being studied and under review as in past decades, several systems of plant taxonomy recognized this family, notably the 1981 Cronquist system.

<span class="mw-page-title-main">Loranthaceae</span> Family of mistletoes

Loranthaceae, commonly known as the showy mistletoes, is a family of flowering plants. It consists of about 75 genera and 1,000 species of woody plants, many of them hemiparasites. The three terrestrial species are Nuytsia floribunda, Atkinsonia ligustrina, and Gaiadendron punctatum Loranthaceae are primarily xylem parasites, but their haustoria may sometimes tap the phloem, while Tristerix aphyllus is almost holoparasitic. For a more complete description of the Australian Loranthaceae, see Flora of Australia online., for the Malesian Loranthaceae see Flora of Malesia.

<span class="mw-page-title-main">Santalaceae</span> Family of flowering plants

The Santalaceae, sandalwoods, are a widely distributed family of flowering plants which, like other members of Santalales, are partially parasitic on other plants. Its flowers are bisexual or, by abortion, unisexual. Modern treatments of the Santalaceae include the family Viscaceae (mistletoes), previously considered distinct.

The Cronquist system is a taxonomic classification system of flowering plants. It was developed by Arthur Cronquist in a series of monographs and texts, including The Evolution and Classification of Flowering Plants and An Integrated System of Classification of Flowering Plants (1981).

<span class="mw-page-title-main">Austrobaileyales</span> Order of flowering plants

Austrobaileyales is an order of flowering plants consisting of about 100 species of woody plants growing as trees, shrubs and lianas. The best-known species is Illicium verum, commonly known as star anise. The order belongs to the group of basal angiosperms, the ANA grade, which diverged earlier from the remaining flowering plants. Austrobaileyales is sister to all remaining extant angiosperms outside the ANA grade.

<span class="mw-page-title-main">Najadales</span> Order of flowering plants

Najadales is the botanical name of an order of flowering plants. A well-known system that used this name is the Cronquist system (1981), which used this name for an order in subclass Alismatidae with this circumscription:

<span class="mw-page-title-main">Olacaceae</span> Family of flowering plants

Olacaceae is a family of flowering plants in the order Santalales. They are woody plants, native throughout the tropical regions of the world. As of July 2021, the circumscription of the family varies; some sources maintain a broad family, others split it into seven segregate families.

<span class="mw-page-title-main">Schoepfiaceae</span> Family of flowering plants

Schoepfiaceae is a family of flowering plants recognized in the APG III system of 2009. The family was previously only recognized by few taxonomists; the plants in question usually being assigned to family Olacaceae and Santalaceae.

<i>Misodendrum</i> Genus of mistletoes

Misodendrum is a genus of hemiparasites which grow as mistletoes on various species of Nothofagus. Its species are all restricted to South America. The name of the genus is incorrectly spelt in a number of ways, including Misodendron and Myzodendron.

<span class="mw-page-title-main">Opiliaceae</span> Family of flowering plants

Opiliaceae is a family of flowering plants comprising 11 genera and 33 known species. It consists of tropical woody plants. Several genera contain parasitic species. The biggest genus, in number of species and in stature of the individual plants, is Agonandra, the only American genus.

<span class="mw-page-title-main">Balanophoraceae</span> Family of flowering plants

The Balanophoraceae are a subtropical to tropical family of obligate parasitic flowering plants, notable for their unusual development and formerly obscure affinities. In the broadest circumscription, the family consists of 16 genera. Alternatively, three genera may be split off into the segregate family Mystropetalaceae.

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

Medusandra is a genus of flowering plants in the family Peridiscaceae. It has two species, Medusandra richardsiana and Medusandra mpomiana. M. richardsiana is the most common and well known. Both species are native to Cameroon and adjacent countries.

The APG III system of flowering plant classification is the third version of a modern, mostly molecular-based, system of plant taxonomy being developed by the Angiosperm Phylogeny Group (APG). Published in 2009, it was superseded in 2016 by a further revision, the APG IV system.

<span class="mw-page-title-main">Aptandraceae</span> Family of flowering plants

The Aptandraceae is a family of flowering plants in the sandalwood order Santalales that is recognized by some sources; others sink the family in Olacaceae. The members of the tropical plant family are parasitic on other plants, usually on the roots, and grow as trees, shrubs or woody lianas.

<span class="mw-page-title-main">Pentapetalae</span> Group of eudicots known as core eudicots

In phylogenetic nomenclature, the Pentapetalae are a large group of eudicots that were informally referred to as the "core eudicots" in some papers on angiosperm phylogenetics. They comprise an extremely large and diverse group that accounting about 65% of the species richness of the angiosperms, with wide variability in habit, morphology, chemistry, geographic distribution, and other attributes. Classical systematics, based solely on morphological information, was not able to recognize this group. In fact, the circumscription of the Pentapetalae as a clade is based on strong evidence obtained from DNA molecular analysis data.

References

  1. 1 2 "Santalales R.Br. ex Bercht. & J.Presl". World Flora Online. Retrieved 2021-07-20.
  2. 1 2 3 4 Angiosperm Phylogeny Group (2016). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG IV". Botanical Journal of the Linnean Society . 181 (1): 1–20. doi: 10.1111/boj.12385 .
  3. Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III". Botanical Journal of the Linnean Society. 161 (2): 105–121. doi: 10.1111/j.1095-8339.2009.00996.x .
  4. 1 2 3 Stevens, P.F. "Santalales". Angiosperm Phylogeny Website. Retrieved 2021-07-20.
  5. 1 2 3 Nickrent, Daniel L. (2020). "Parasitic angiosperms: How often and how many?". Taxon. 69 (1): 5–27. doi:10.1002/tax.12195.
  6. Cronquist, A. (1981). An integrated system of classification of flowering plants . New York: Columbia University Press. ISBN   978-0-231-03880-5.
  7. "Medusandra Brenan". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2021-07-20.