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The Crossosomatales are an order, first recognized as such by APG II. They are flowering plants included within the Rosid eudicots.

Crossosomatales
Staphylea colchica.jpg
Staphylea colchica
Scientific classification e
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Clade: Malvids
Order: Crossosomatales
Takht. ex Reveal[1]
Families

DescriptionEdit

Species assigned to the Crossosomatales have in common flowers that are positioned solitarily, with the base of the calyx, corolla, and stamens fused into a tube-shaped floral cup, sepals overlapping, the outermost smaller than the inner. Insides of the casings of pollen grains have horizontally extended thin regions (or endo-apertures). The gynoecium is placed on a short stalk, papillae on the stigma consist of two or more cells, ovary locules taper upwards, and the protective cell layer (or integument) surrounding the ovule leaves a zigzag opening (or micropyle). Some cell clusters have bundles of long yellow crystals, mucilage cells are present, and seeds have a smooth, woody coating.[2]

TaxonomyEdit

The relationships between orders within the Malvid clade, according to the APG system, is represented by the following tree.[3]

Malvids

Geraniales

Myrtales

Crossosomatales

Picramniales

Sapindales

Huerteales

Brassicales

Malvales

Within the Crossosomatales, the APG III system of 2009 recognises families represented in the following tree.[4]

Crossosomatales

Strasburgeriaceae

Geissolomataceae

Aphloiaceae

Staphyleaceae

Guamatelaceae

Stachyuraceae

Crossosomataceae

ReferencesEdit

  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. Archived from the original (PDF) on 2017-05-25. Retrieved 2013-07-06.
  2. ^ Matthews M.R, Endress P.K (2005). "Comparative floral structure and systematics in Crossosomatales (Crossosomataceae, Stachyuraceae, Staphyleaceae, Aphloiaceae, Geissolomataceae, Ixerbaceae, Strasburgeriaceae)". Botanical Journal of the Linnean Society. 147 (1): 1–46. doi:10.1111/j.1095-8339.2005.00347.x.
  3. ^ Peter F. Stevens (2001). "Angiosperm Phylogeny Website".
  4. ^ 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. doi:10.11110/kjpt.2010.40.4.208.