Hamamelididae is a botanical name at the rank of subclass. A well-known system that used this name is the Cronquist system, although in the disallowed spelling Hamamelidae. In the original 1981 version of this system the circumscription was:
- subclass Hamamelidae
As is true for any botanical name, circumscription of the subclass will vary with the taxonomic system being used; the only requirement being that it includes the family Hamamelidaceae. The APG II system does not recognize named taxa above the rank of order but places most of the taxa involved in the rosids clade, with Hamamelidaceae itself in order Saxifragales.
The Subclass Hamamelididae is a member of the Class Magnoliopsida. Here is the complete "parentage" of Hamamelididae:
- Domain: Eukaryota
Whittaker & Margulis,1978 - eukaryotes
- Kingdom: Plantae
Haeckel, 1866 - Plants
- Subkingdom: Viridaeplantae Cavalier-Smith, 1981 - Green Plants
- Kingdom: Plantae Haeckel, 1866 - Plants
The Subclass Hamamelididae is further organized into finer groupings including:
- Order (10): Buxales · Caryophyllales · Corylales · Didymelales · Gunnerales · Hamamelidales · Proteales · Ranunculales · Saxifragales · Trochodendrales
Buxales is a botanical name at the rank of order. [more]
Caryophyllales is an order of flowering plants that includes the cacti, carnations, amaranths, ice plants, and many carnivorous plants. Many members are succulent, having fleshy stems or leaves. [more]
Gunnerales is an order of flowering plants. In the APG III system (2009) it contains two genera: Gunnera and Myrothamnus. These are assigned to two separate families (Gunneraceae and Myrothamnaceae, respectively). In the Cronquist system (1981) Gunneraceae was placed in the Haloragales and Myrothamnaceae in the Hamamelidales. [more]
Ranunculales is an order of flowering plants. Of necessity it contains the family Ranunculaceae, the buttercup family, because the name of the order is based on the name of a genus in that family. Ranunculales belongs to a paraphyletic group known as the basal eudicots. It is the most basal clade in this group; in other words, it is sister to the remaining eudicots. [more]
Saxifragales is an order of flowering plants. Their closest relatives are a large eudicot group known as the rosids by the definition of rosids given in the APG II classification system. Some authors define the rosids more widely, including Saxifragales as their most basal group. Saxifragales is one of the eight groups that compose the core eudicots. The others are Gunnerales, Dilleniaceae, rosids, Santalales, Berberidopsidales, Caryophyllales, and asterids. [more]
At least 7 species and subspecies belong to the Order Trochodendrales.
More info about the Order Trochodendrales may be found here.
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