Borasseae

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Borasseae
Temporal range: Maastrichtian–Recent
Atakora-Borassus aethiopum (4).jpg
Borassus aethiopum in Atakora, Benin
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Arecales
Family: Arecaceae
Subfamily: Coryphoideae
Tribe: Borasseae
Mart.
Type genus
Borassus
L.
Genera

Bismarckia Hildebrandt & H. Wendl.
Borassodendron Becc.
Borassus L.
Hyphaene Gaertn.
Latania Comm. ex Juss.
Lodoicea Comm. ex DC.
Medemia Wurttemb. ex H. Wendl.
Satranala J.Dransf. & Beentje

Contents

Borasseae is a tribe in the palm subfamily Coryphoideae. [1] [2] The tribe ranges from southern Africa and Madagascar north through the Arabian Peninsula to India, Indochina, Indonesia and New Guinea. Several genera are restricted to islands in the Indian Ocean. The two largest genera, Hyphaene and Borassus , are also the most widespread. [3]

Description

Borassoid palms typically have large, column-like trunks, though several species of Hyphaene have branching or clustered stems. The leaves are large, palmate and often with spines or sharp edges along the petioles. Leaves are retained on young palm stems, later falling to reveal prominent scars. All genera in the Borasseae are dioecious, with separate male and female trees; they are pleonanthic, flowering regularly for many years. Inflorescences are large and pendulous; the male flowers are much smaller than the female and are borne in clusters within catkin-like structures. Fruits contain hard, woody endocarps surrounding the seeds; they range in size from date-sized ( Latania ) to the massive fruits of Lodoicea , which contain the largest seed in the world. [3] [4] [5]

Taxonomy

The Borasseae is one of eight tribes in subfamily Coryphoideae. [6] The tribe is monophyletic and most phylogenetic studies place it as sister to tribe Corypheae, though it is also close to tribe Caryoteae and tribe Chuniophoeniceae. [5] [6] Together, the four tribes make up the syncarpous clade, all members of which have syncarpous ovaries with united carpels. [3]

The eight genera of tribe Borasseae split evenly into two subtribes. In the palms of subtribe Hyphaenieae, both the male and female flowers are sunken within pits and the fruits are stalked and typically one-seeded. [3] Bismarckia (1 sp., B. nobilis) and Satranala (1 sp., S. decussilvae) are endemic to Madagascar, Medemia (1 sp., M. argun) is restricted to Egypt and Sudan, while Hyphaene (8 spp.) [7] ranges from southern Africa and Madagascar to western India. In subtribe Lataniieae, only the male flowers are sunken in pits and the fruits are sessile, with 1-3 seeds. [3] Lodoicea (1 sp., L. maldivica) is endemic to the Seychelles, Latania (3 spp.) is endemic to the Mascarene Islands, while Borassodendron has two species, one in Borneo (B. borneense) and one in the Malay Peninsula ( B. machadonis ). The last of the genera, Borassus (5 spp.), [8] is the most widespread and is found in Sub-Saharan Africa, Madagascar, Southeast Asia and New Guinea. [8] An extinct genus of the subtribe Hyphaeninae is known from the Maastrichtian aged Intertrappean Beds of India. [9]

SubtribeImageGenusSpecies
Hyphaenieae Bismarckia nobilis .jpg Bismarckia Hildebr. & H.Wendl.
Satranala Beentje & J.Dransf.
Medemia argun (aspect general) - Jardin de Nong-Nooch.jpg Medemia Wuert. ex H.Wendl.
Lala Palm (Hyphaene coriacea) (11531392816).jpg Hyphaene Gaertn.
Lataniieae Lodoicea Maldivica A.jpg Lodoicea Comm. ex DC.
Latania loddigesii 8zz.jpg Latania Comm. ex Juss.
Borassodendron machadonis 2 (8024076645).jpg Borassodendron Becc.
Borassus Aethiopum jeunes 06.jpg Borassus L.

Conservation

Many species in tribe Borasseae are threatened with extinction (36% of total recognized species): [10] [11]

Related Research Articles

<i>Chelyocarpus</i> Genus of palms

Chelyocarpus is a genus of small to medium-sized fan palms which are native to northwestern South America. Some are upright trees, while others creep along the ground. Species are used for thatch, to weave hats, stuff pillows and as a source of salt.

<i>Itaya</i> Species of plant

Itaya amicorum is a medium-size fan palm that is native to Brazil, Colombia and Peru. It is the only species in the genus Itaya. It was unknown to science until 1972, when it was discovered on the bank of the Itaya River in the Peruvian Amazon.

<i>Latania</i> Genus of palms

Latania, commonly known as latan palm or latania palm, is a genus of flowering plant in the palm tree family, native to the Mascarene Islands in the western Indian Ocean.

<i>Trithrinax</i> Genus of palms

Trithrinax is a genus of flowering plants in the subfamily Coryphoideae of the family Arecaceae. The name is derived from ancient Greek, where tri means three, and thrinax trident. It was named in 1837 by Carl Friedrich Philipp von Martius, a German botanist and explorer.

<span class="mw-page-title-main">Ceroxyloideae</span> Subfamily of palms

The Ceroxyloideae are a subfamily of flowering plants in the palm family found mainly in the Americas with an outlying genus in each of Australia, Madagascar, and the Comoros. Recently revised, the former subfamily Phytelephantoideae was reduced to the tribal level and included, while the Hyophorbeae tribe was reassigned to Arecoideae; it now contains eight genera.

<span class="mw-page-title-main">Archontophoenicinae</span> Subtribe of palms

Archontophoenicinae is a botanical subtribe consisting of four genera of palms, namely Archontophoenix from Queensland and New South Wales and Actinokentia, Chambeyronia and Kentiopsis from New Caledonia. Phylogenetic relationships between the four genera are unresolved.

<span class="mw-page-title-main">Rhopalostylidinae</span> Subtribe of palms

Rhopalostylidinae is a botanical subtribe consisting of two genera of palms from Australia and New Zealand, Hedyscepe and Rhopalostylis. These two genera were formerly included in Archontophoenicinae, to which they are morphologically similar, until a recent revision.

<span class="mw-page-title-main">Coryphoideae</span> Subfamily of palms

The Coryphoideae is one of five subfamilies in the palm family, Arecaceae. It contains all of the genera with palmate leaves, excepting Mauritia, Mauritiella and Lepidocaryum, all of subfamily Calamoideae, tribe Lepidocaryeae, subtribe Mauritiinae. However, all Coryphoid palm leaves have induplicate (V-shaped) leaf folds, while Calamoid palms have reduplicate leaf folds. Pinnate leaves do occur in Coryphoideae, in Phoenix, Arenga, Wallichia and bipinnate in Caryota.

<span class="mw-page-title-main">Corypheae</span> Tribe of palms

Corypheae is a tribe of palm trees in the subfamily Coryphoideae. In previous classifications, tribe Corypheae included four subtribes: Coryphinae, Livistoninae, Thrinacinae and Sabalinae, but recent phylogenetic studies have led to the genera within these subtribes being transferred into other tribes. Tribe Corypheae is now restricted to the genus Corypha alone.

<span class="mw-page-title-main">Cryosophileae</span> Tribe of palms

Cryosophileae is a tribe of palms in the subfamily Coryphoideae. The tribe ranges from southern South America, through Central America, into Mexico and the Caribbean. It includes New World genera formerly included in the tribe Thrinacinae, which was split after molecular phylogenetic studies showed that Old World and New World members of the tribe were not closely related.

Areceae is a palm tree tribe in the family Arecaceae.

<span class="mw-page-title-main">Caryoteae</span> Tribe of plants

Caryoteae is a tribe in the palm family Arecaceae, distributed across Southeast Asia, from southern India and Sri Lanka east to Vanuatu and northernmost Queensland, Australia. It was long considered a member of subfamily Arecoideae on the basis of its inflorescences, which resemble those of tribe Iriarteeae, and the flowers arranged in triads, which are common across Arecoideae. However, phylogenetic studies based on DNA repeatedly link Caryoteae to subfamily Coryphoideae. Caryoteae do have leaves with induplicate folds, a feature found in most Coryphoid palms, but unlike most Coryphoideae, the leaves are pinnate or bipinnate (Caryota). Phoenix is the only other Coryphoid genus with induplicate, pinnate leaves.

<span class="mw-page-title-main">Chuniophoeniceae</span> Tribe of palms

Chuniophoeniceae is a tribe of palms in subfamily Coryphoideae of plant family Arecaceae. The four genera within the tribe are morphologically dissimilar and do not have overlapping distributions. Three of the genera are monotypic, while the fourth genus (Chuniophoenix) has three species.

<span class="mw-page-title-main">Trachycarpeae</span> Tribe of palms

Trachycarpeae is a tribe of palms in subfamily Coryphoideae of the plant family Arecaceae. It has the widest distribution of any tribe in Coryphoideae and is found on all continents, though the greatest concentration of species is in Southeast Asia. Trachycarpeae includes palms from both tropical and subtropical zones; the northernmost naturally-occurring palm is a member of this tribe. Several genera can be found in cultivation in temperate areas, for example species of Trachycarpus, Chamaerops, Rhapidophyllum and Washingtonia.

Lepidocaryeae is a tribe of plants in the family Arecaceae. Subtribes and genera in the tribe are:

<span class="mw-page-title-main">Geonomateae</span> Tribe of palms

Geonomateae is a palm tribe in the subfamily Arecoideae. It is an important Neotropical group due to its wide distribution across Central and South America, its diversity and abundance, and the use of a number of species by local human populations. The distribution of the tribe stretches from southeast Mexico down through Central America and into South America, notably Brazil and Bolivia, and species are also found in the Greater and Lesser Antilles. This tribe consists of a group of understory and sub-canopy palms that populate both tropical lowland and montane forests. While members of this group are relatively easy to collect, as they are not canopy palms or spiny palms, and are well represented in herbaria, the taxonomy and phylogeny of the species within the tribe are still uncertain. The resolution of the tribe has been disputed despite the fact that tribe's species are characterized by three morphological synapomorphies: the petals of pistillate flowers are basally connate, the presence of slender and elongate styles, and the flowers are borne in pits in the rachillae.

Hyphaenieae is a subtribe of plants in the family Arecaceae found mostly in Madagascar and mainland Africa. Genera in the subtribe, all of which are monotypic, are:

Lataniieae is a subtribe of plants in the family Arecaceae. Genera in the subtribe are:

Attaleinae is a subtribe of plants in the family Arecaceae. Genera in the subtribe, the majority of which are found in South America, are:

References

  1. Baker, William J.; Dransfield, John (2016). "Beyond Genera Palmarum: progress and prospects in palm systematics". Botanical Journal of the Linnean Society. 182 (2): 207–233. doi: 10.1111/boj.12401 .
  2. Dransfield, John; Uhl, Natalie W.; Asmussen, Conny B.; Baker, William J.; Harley, Madeline M.; Lewis, Carl E. (2008). Genera Palmarum: The Evolution and Classification of Palms. Royal Botanic Gardens, Kew. ISBN   978-1-84246-182-2.
  3. 1 2 3 4 5 Dransfield, John; Uhl, Natalie W.; Asmussen, Conny B.; Baker, William J.; Harley, Madeline M.; Lewis, Carl E. (2008). Genera Palmarum - The Evolution and Classification. International Palm Society. ISBN   9781842461822.
  4. Uhl, Natalie W.; Dransfield, John (1987). Genera Palmarum: A Classification of Palms Based on the Work of Harold E. Moore, Jr. Libert Hyde Hortorium. ISBN   978-0935868302.
  5. 1 2 Bayton, Ross P. (2005). Borassus L. and the Borassoid palms: systematics and evolution. PhD Thesis. University of Reading.
  6. 1 2 Dransfield, John; Uhl, Natalie W.; Asmussen, Conny B.; Baker, William J.; Harley, Madeline M.; Lewis, Carl E. (2005). "A new phylogenetic classification of the palm family, Arecaceae". Kew Bulletin. 60: 559–569 via ResearchGate.
  7. Stauffer, Fred W. "Hyphaene – A multidisciplinary study". www.hyphaene.org. Retrieved 2018-03-01.
  8. 1 2 Bayton, R. P. (2007). "A Revision of Borassus L. (Arecaceae)". Kew Bulletin. 62 (4): 561–585. JSTOR   20443389.
  9. Matsunaga, Kelly K S; Manchester, Steven R; Srivastava, Rashmi; Kapgate, Dashrath K; Smith, Selena Y (2019-06-21). "Fossil palm fruits from India indicate a Cretaceous origin of Arecaceae tribe Borasseae". Botanical Journal of the Linnean Society. 190 (3): 260–280. doi: 10.1093/botlinnean/boz019 . ISSN   0024-4074.
  10. "The IUCN Red List of Threatened Species". www.iucnredlist.org. Retrieved 2018-03-01.
  11. Govaerts, R.; Dransfield, J. (2009). World Checklist of Palms. London: Royal Botanic Gardens, Kew. ISBN   9781842460849.