Laurales

The Laurales are an order of flowering plants. They are magnoliids, related to the Magnoliales.

Laurales
Laurus nobilis flowers and leaves
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Magnoliids
Order: Laurales
Juss. ex Bercht. & J.Presl[1]
Families

The order includes about 2500-2800 species from 85-90 genera, which comprise seven families of trees and shrubs. Most of the species are tropical and subtropical, though a few genera reach the temperate zone. The best known species in this order are those of the Lauraceae (for example bay laurel, cinnamon, avocado, and Sassafras), and the ornamental shrub Calycanthus of the Calycanthaceae.

The earliest lauraceous fossils are from the early Cretaceous. It is possible that the ancient origin of this order is one of the reasons for its highly diverged morphology. Presently no single morphological property is known, which would unify all the members of Laurales. The presently accepted classification is based on molecular and genetic analysis.

Classification

The first botanist to think of the Laurales as a natural group was H. Hallier in 1905. He viewed them as being derived from the Magnoliales. During some or all of the 20th century, the Laurales generally included Amborella and the plants now classified in Austrobaileyales and Chloranthaceae. They were not removed until the advent of molecular data in the late 20th century; their previous inclusion made it harder to determine the relationships within the Laurales and between the Laurales and other groups.[2]

The following families are included in the Angiosperm Phylogeny Group system (APG III):[1]

order Laurales
family Atherospermataceae
family Calycanthaceae
family Gomortegaceae
family Hernandiaceae
family Lauraceae
family Monimiaceae
family Siparunaceae
Magnoliids
 
 

Canellales

 
 

Piperales

 
 
 
 
Laurales
 

Calycanthaceae

 
 
 
 

Siparunaceae

 
 
 

Atherospermataceae

 
 

Gomortegaceae

 
 
 
 
 

Hernandiaceae

 
 
 

Monimiaceae

 
 

Lauraceae

 
 
 
 
 
 
 

Magnoliales

 
 
 
The current composition and phylogeny of the Laurales.[3][4]

Under the older Cronquist system, the Laurales included a slightly different set of families (current placement, where different, in brackets):

References
  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.
  2. Susanne S. Renner (1999). "Circumscription and phylogeny of the Laurales: evidence from molecular and morphological data". American Journal of Botany. 86 (9): 1301–1315. doi:10.2307/2656778. JSTOR 2656778. PMID 10487818. S2CID 791936. Full text (pdf).
  3. Angiosperm Phylogeny Group (2003). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG II". Botanical Journal of the Linnean Society. 141 (4): 399–436. doi:10.1046/j.1095-8339.2003.t01-1-00158.x.
  4. Soltis, P. S.; Soltis, D. E. (2004). "The origin and diversification of Angiosperms". American Journal of Botany. 91 (10): 1614–1626. doi:10.3732/ajb.91.10.1614. PMID 21652312.
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