Xeronema

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Xeronema
Xeronema moorii 136-8342.jpg
Xeronema moorei
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Xeronemataceae
M.W.Chase, Rudall & M.F.Fay [1]
Genus: Xeronema
Brongn. & Gris [2]
Type species
Xeronema moorei
Species
Map-Xeronemataceae.PNG
Xeronema distribution map
Synonyms [3]

ScleronemaBrongn. & Gris 1864 not Benth. 1862

Xeronema is a genus of flowering plants containing two species, Xeronema moorei from New Caledonia, and Xeronema callistemon (the Poor Knights lily) from the Poor Knights Islands and Taranga Island in New Zealand. The plants are herbaceous monocots, spreading by rhizomes, and have large flowers set on terminal spikes, with stamens towering above the flowers.

The type species X. moorei is found in the mountains of New Caledonia.

The Poor Knights lily (X. callistemon) is endemic to the Poor Knights Islands and Taranga Island in the north of New Zealand. It was discovered in 1924. The Poor Knights lily has large bottlebrush flower clusters that grow horizontally. The clusters begin growing vertically and then bend sideways. Bright red flowers grow upward from the stalk, with bright orange pollen. The plant can reach a height of one metre tall and across.

The APG IV system, of 2016, accepts this genus as constituting its own family Xeronemataceae. It places this in the order Asparagales, in the clade monocots. [4] The family can be separated from other Asparagales families on DNA evidence; it is related to Asphodelaceae but differs in having uniformly unifacial leaves like Iridaceae. [1]

Related Research Articles

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

Asparagales is an order of plants in modern classification systems such as the Angiosperm Phylogeny Group (APG) and the Angiosperm Phylogeny Web. The order takes its name from the type family Asparagaceae and is placed in the monocots amongst the lilioid monocots. The order has only recently been recognized in classification systems. It was first put forward by Huber in 1977 and later taken up in the Dahlgren system of 1985 and then the APG in 1998, 2003 and 2009. Before this, many of its families were assigned to the old order Liliales, a very large order containing almost all monocots with colorful tepals and lacking starch in their endosperm. DNA sequence analysis indicated that many of the taxa previously included in Liliales should actually be redistributed over three orders, Liliales, Asparagales, and Dioscoreales. The boundaries of the Asparagales and of its families have undergone a series of changes in recent years; future research may lead to further changes and ultimately greater stability. In the APG circumscription, Asparagales is the largest order of monocots with 14 families, 1,122 genera, and about 36,000 species.

<span class="mw-page-title-main">Alismatales</span> Order of herbaceous flowering plants of marshy and aquatic habitats

The Alismatales (alismatids) are an order of flowering plants including about 4,500 species. Plants assigned to this order are mostly tropical or aquatic. Some grow in fresh water, some in marine habitats. Perhaps the most important food crop in the order is the corm of the taro plant, Colocasia esculenta.

<span class="mw-page-title-main">Liliales</span> Order of monocot flowering plants, including lilies

Liliales is an order of monocotyledonous flowering plants in the Angiosperm Phylogeny Group and Angiosperm Phylogeny Web system, within the lilioid monocots. This order of necessity includes the family Liliaceae. The APG III system (2009) places this order in the monocot clade. In APG III, the family Luzuriagaceae is combined with the family Alstroemeriaceae and the family Petermanniaceae is recognized. Both the order Lililiales and the family Liliaceae have had a widely disputed history, with the circumscription varying greatly from one taxonomist to another. Previous members of this order, which at one stage included most monocots with conspicuous tepals and lacking starch in the endosperm are now distributed over three orders, Liliales, Dioscoreales and Asparagales, using predominantly molecular phylogenetics. The newly delimited Liliales is monophyletic, with ten families. Well known plants from the order include Lilium (lily), tulip, the North American wildflower Trillium, and greenbrier.

<span class="mw-page-title-main">Monocotyledon</span> Clade of flowering plants

Monocotyledons, commonly referred to as monocots, are grass and grass-like flowering plants (angiosperms), the seeds of which typically contain only one embryonic leaf, or cotyledon. They constitute one of the major groups into which the flowering plants have traditionally been divided; the rest of the flowering plants have two cotyledons and are classified as dicotyledons, or dicots.

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

Brodiaea, also known by the common name cluster-lilies, is a monocot genus of flowering plants.

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

Alstroemeriaceae is a family of flowering plants, with 254 known species in four genera, almost entirely native to the Americas, from Central America to southern South America. One species of Luzuriaga occurs in New Zealand, and the genus Drymophila is endemic to south-eastern Australia.

<span class="mw-page-title-main">Hemerocallidoideae</span> Subfamily of flowering plants

Hemerocallidoideae is a subfamily of flowering plants, part of the family Asphodelaceae sensu lato in the monocot order Asparagales according to the APG system of 2016. Earlier classification systems treated the group as a separate family, the Hemerocallidaceae. The name is derived from the generic name of the type genus, Hemerocallis. The largest genera in the group are Dianella, Hemerocallis (15), and Caesia (11).

<span class="mw-page-title-main">Scilloideae</span> Subfamily of bulbous monocot plants

Scilloideae is a subfamily of bulbous plants within the family Asparagaceae. Scilloideae is sometimes treated as a separate family Hyacinthaceae, named after the genus Hyacinthus. Scilloideae or Hyacinthaceae include many familiar garden plants such as Hyacinthus (hyacinths), Hyacinthoides (bluebells), Muscari and Scilla and Puschkinia. Some are important as cut flowers.

<span class="mw-page-title-main">Asphodelaceae</span> Family of flowering plants in the order Asparagales

Asphodelaceae is a family of flowering plants in the order Asparagales. Such a family has been recognized by most taxonomists, but the circumscription has varied widely. In its current circumscription in the APG IV system, it includes about 40 genera and 900 known species. The type genus is Asphodelus.

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

Hypoxidaceae is a family of flowering plants, placed in the order Asparagales of the monocots.

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

Asteliaceae is a family of flowering plants, placed in the order Asparagales of the monocots.

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

Boryaceae is a family of highly drought-tolerant flowering plants native to Australia, placed in the order Asparagales of the monocots. The family includes two genera, with twelve species in total in Australia.

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

Ixiolirion is a genus of flowering plants native to central and southwest Asia, first described as a genus in 1821. Recent classifications place the group in the monogeneric family Ixioliriaceae in the order Asparagales of the monocots. In earlier systems of classification, it was usually placed in the family Amaryllidaceae.

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

Doryanthes is the sole genus in the flowering plant family Doryanthaceae. The genus consists of two species, D. excelsa and D. palmeri, both endemic natives of the coast of Eastern Australia. Doryanthaceae is part of the order Asparagales.

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

Blandfordia, commonly known as Christmas bells, is a genus of four species of flowering plants native to eastern Australia. Christmas bells are tufted, perennial herbs with narrow, linear leaves and up to twenty large, drooping, cylindrical or bell-shaped flowers.

<span class="mw-page-title-main">Basal angiosperms</span> Descendants of most extant flowering plants

The basal angiosperms are the flowering plants which diverged from the lineage leading to most flowering plants. In particular, the most basal angiosperms were called the ANITA grade, which is made up of Amborella, Nymphaeales and Austrobaileyales.

<i>Xeronema callistemon</i> Species of flowering plant

Xeronema callistemon is a species of flowering plant endemic to the Poor Knights Islands and Taranga Island in the north of New Zealand. It was discovered in 1924 and has a common name Poor Knights lily. The plant is listed as vulnerable in the 1997 IUCN Red List of Plants, but as of October 2010 is not listed in the IUCN Red List of Threatened Species.

<span class="mw-page-title-main">Lilioid monocots</span> Grade of flowering plant orders, within Lilianae

Lilioid monocots is an informal name used for a grade of five monocot orders in which the majority of species have flowers with relatively large, coloured tepals. This characteristic is similar to that found in lilies ("lily-like"). Petaloid monocots refers to the flowers having tepals which all resemble petals (petaloid). The taxonomic terms Lilianae or Liliiflorae have also been applied to this assemblage at various times. From the early nineteenth century many of the species in this group of plants were put into a very broadly defined family, Liliaceae sensu lato or s.l.. These classification systems are still found in many books and other sources. Within the monocots the Liliaceae s.l. were distinguished from the Glumaceae.

<span class="mw-page-title-main">Families of Asparagales</span>

The Asparagales are an order of plants, and on this page the structure of the order is used according to the APG III system. The order takes its name from the family Asparagaceae and is placed in the monocots. The order is clearly circumscribed on the basis of DNA sequence analysis, but is difficult to define morphologically, since its members are structurally diverse. The APG III system is used in World Checklist of Selected Plant Families from the Royal Botanical Gardens at Kew. With this circumscription, the order consists of 14 families with approximately 1120 genera and 26000 species.

References

  1. 1 2 Chase MW, Rudall PJ, Fay MF (2000). "Xeronemataceae, a new family of asparagoid lilies from New Caledonia and New Zealand". Kew Bulletin. 55 (4): 865–870. doi:10.2307/4113631. JSTOR   4113631.
  2. 1 2 Brongniart A, Gris A (1864). "Sur un nouveau genre de Liliacées". Bulletin de la Société botanique de France. 11 (9): 316–317. doi: 10.1080/00378941.1864.10827371 .
  3. Kew World Checklist of Selected Plant Families
  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 . ISSN   0024-4074.