Lepidobotryaceae

Lepidobotryaceae is a flowering plant family in the order Celastrales.[2] It contains only two genera, each with a single species: Lepidobotrys staudtii and Ruptiliocarpon caracolito.[3][4]

Lepidobotryaceae
L. staudtii, from Vegetation der Erde (1915)
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Celastrales
Family: Lepidobotryaceae
J.Léonard[1]
Genera

Description

The Lepidobotryaceae are dioecious trees. The leaves are alternate and arranged in two rows along the stems. The blade is elliptical in shape and the margin is entire. The leaves appear simple, but are actually unifoliate. A unifoliate leaf is a type of compound leaf that consists of a single leaflet mounted on the end of a rachis. A joint occurs where the leaflet is attached to the rachis.[5] In Lepidobotryaceae, this joint bears a single, elongate stipel and a pair of small stipules where the petiole attaches to the stem. After the emergence of the leaf, the stipel and stipules soon fall away.

The flowers are produced in small inflorescences opposite the leaves.[6] They are small and greenish with five sepals and five petals. The sepals and petals are similar in size and appearance, free from each other, or very shortly united at the base. In the flower bud, the sepals are arranged quincuncially. This means that two are inside, two are outside, and one of them has one margin exposed and the other covered.[7] The nectary disk is fleshy in Lepidobotrys, but extended into a tube in Ruptiliocarpon.[3] The stamens are in two whorls of five, one whorl opposite the sepals and the other opposite the petals. Those in the outer whorl, opposite the sepals, are longer. The filaments are fused at the base, shortly in Lepidobotrys, but forming an extension of the tubular nectary in Ruptiliocarpon. The pollen is produced in four thecae on each anther. The stigmas are elongated, appearing as false styles, known as stylodia.[3] The ovary is located inside the flower, rather than below. It has two or three locules, with two ovules per locule. The ovules are attached to the partition that separates the locules, near its summit. The fruit is a capsule with one, or rarely, two seeds. The seeds are black and partly covered with an orange aril.

In 2000, a DNA analysis of the eudicots based on the rbcL gene showed that the families Lepidobotryaceae, Parnassiaceae, and Celastraceae form a strongly supported clade.[8] The authors of this study recommended that these three families constitute the order Celastrales. This result was strongly supported by later studies.[9][10]

The families into which Lepidobotrys had usually been placed, Linaceae and Oxalidaceae, are now placed in the orders Malpighiales and Oxalidales, respectively, which are closely related to Celastrales. The orders Celastrales, Oxalidales, and Malpighiales, along with the unplaced family Huaceae form a group known as the COM clade of the rosids.[10]

References
  1. 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.
  2. "Lepidobotryaceae" In: Peter F. Stevens (2001 onwards). Angiosperm Phylogeny Website. In: Missouri Botanical Garden Website. (see External links below).
  3. Klaus Kubitzky. "Lepidobotryaceae" In: Klaus Kubitzki (ed.). The Families and Genera of Vascular Plants vol.VI. Springer-Verlag: Berlin,Heidelberg, Germany (2004).
  4. Christenhusz, M. J. M.; Byng, J. W. (2016). "The number of known plants species in the world and its annual increase". Phytotaxa. 261 (3): 201–217. doi:10.11646/phytotaxa.261.3.1.
  5. Glossary In: Peter F. Stevens (2001 onwards). Angiosperm Phylogeny Website. In: Missouri Botanical Garden Website. (see External links below).
  6. Barry E. Hammel, and Nelson A. Zamora (1993). "Ruptiliocarpon (Lepidobotryaceae): A New Arborescent Genus and Tropical American Link to Africa, with a Reconsideration of the Family". Novon 3(4):408-417.
  7. Benjamin D. Jackson. A Glossary of Botanic Terms. Duckworth: London (1928).
  8. Vincent Savolainen, Michael F. Fay, Dirk C. Albach, Anders Backlund, Michelle van der Bank, Kenneth M. Cameron, S.A. Johnson, M. Dolores Lledo, Jean-Christophe Pintaud, Martyn P. Powell, Mary Clare Sheahan, Douglas E. Soltis, Pamela S. Soltis, Peter Weston, W. Mark Whitten, Kenneth J. Wurdack and Mark W. Chase (2000). "Phylogeny of the eudicots: a nearly complete familial analysis based on rbcL gene sequences". Kew Bulletin 55(2):257-309.
  9. Li-Bing Zhang and Mark P. Simmons (2006). "Phylogeny and Delimitation of the Celastrales Inferred from Nuclear and Plastid Genes". Systematic Botany 31(1):122-137.
  10. Hengchang Wang, Michael J. Moore, Pamela S. Soltis, Charles D. Bell, Samuel F. Brockington, Roolse Alexandre, Charles C. Davis, Maribeth Latvis, Steven R. Manchester, and Douglas E. Soltis (2009). "Rosid radiation and the rapid rise of angiosperm-dominated forests". Proceedings of the National Academy of Sciences 106(10):3853-3858. 10Mar2009.
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