Caryophyllidae is a botanical name at the rank of subclass. At the moment, there is no complete consensus about what orders it includes, except that it presumably contains the order Caryophyllales. Note that this is only a naming difficulty: what to call various taxa of plants; there is little debate about how the plants in question are related.
A well-known system that used this name is the Cronquist system, and in the original, 1981, version of this system the circumscription was:
- subclass Caryophyllidae
- order Caryophyllales
- order Polygonales
- order Plumbaginales
These plants form the order Caryophyllales in the APG II system, 2003.
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Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction