- Trochodendraceae
Taxobox
name = Trochodendraceae
image_width = 230px
image_caption = "Trochodendron aralioides"
regnum =Plant ae
ordo = unplaced
familia = Trochodendraceae
familia_authority = Eichler
subdivision_ranks = Genera
subdivision = See textTrochodendraceae is the
botanical name for a family offlowering plants .The
APG II system , of 2003 (unchanged from theAPG system , of 1998), also recognizes this family: it is unplaced as to order and left among the basal lineages of theeudicots . As the default option, APG (in both versions of the system) accepts this as a family of two species, both trees, but it does allow the option of segregating familyTetracentraceae , as an optional segregate.This segregation would lead to two families of each one species, of trees: Tetracentraceae with "
Tetracentron sinense " and Trochodendraceae with "Trochodendron aralioides ". These two species share the feature of secondary xylem without vessels, which is quite rare in angiosperms. As the vessel-free wood suggested primitiveness these two species have always attracted taxonomic attention.The
Cronquist system , of 1981, accepted both families and placed these in the orderTrochodendrales , in subclassHamamelidae , in classMagnoliopsida .The
Dahlgren system made the same choice at the rank of family and order, but placed this order in superorderRosanae in subclassMagnoliidae .The
Engler system , in its update of 1964, placed both families in a rather large orderMagnoliales , in subclassArchychlamydeae in classDicotyledoneae .The
Wettstein system , last updated in 1935, united the two species in family Trochodendraceae which was placed in orderPolycarpicae (the predecessor of order Magnoliales), in subclassChoripetalae , in classDicotyledones .External links
* [http://delta-intkey.com/angio/www/Trochode.htm Trochodendraceae] in L. Watson and M.J. Dallwitz (1992 onwards). " [http://delta-intkey.com/angio/ The families of flowering plants] : descriptions, illustrations, identification, information retrieval." Version: 3rd May 2006. http://delta-intkey.com.
* [http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=10918 Trochodendraceae in the "Flora of China"]
* [http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Tree&id=4405&lvl=3&p=mapview&p=has_linkout&p=blast_url&p=genome_blast&lin=f&keep=1&srchmode=1&unlock NCBI Taxonomy Browser]
* [http://www.csdl.tamu.edu/FLORA/cgi/gateway_family?fam=Trochodendraceae links at CSDL]
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