Crossosomatales

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

The Crossosomatales are an order, newly recognized by the APG II, of flowering plants, included within the Rosids, which are part of the eudicots.

Description[edit]

The species assigned to the Crossosomatales have in common that the flowers are positioned solitary, with the base of the calyx, corolla, and stamens fused into a tube-shaped floral cup, the sepals overlapping, with the outermost smaller than inner ones. The inside of the casings of the pollen grains have horizontally extended thin regions (or endo-apertures). The gynoecium is placed on a short stalk, the papillae on the stigma consist of two or more cells, the 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 seed skin.[2]

Taxonomy[edit]

The relationships between the orders is 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 the families that are represented in following tree, which is based the most recent insights in the relationships within the Crossosomatales.[4]

Crossosomatales

Strasburgeriaceae

Geissolomataceae

Aphloiaceae

Staphyleaceae

Guamatelaceae

Stachyuraceae

Crossosomataceae

References[edit]

  1. ^ Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III" (PDF). Botanical Journal of the Linnean Society. 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x. 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.