Taxonomy of Flowering Plants - LECTURE NOTES - Spring, 1998
Hugh D. Wilson - rm. 306, Butler Hall
11 February 1998
The Magnoliidae
Family Overview - The Laurales

Lauraceae - the Laurel Family

Diversity:  31 genera with ca. 2,500 species, nearly all woody (arborescent or fruticose - subfamily Lauroideae) with 1 genus of scandent parasites placed in the other subfamily, the Cassythoideae.

Distribution:  Present in tropical and subtropical areas of both hemispheres and especially diverse in Southeast Asia.  5 genera in the Texas flora, each with a single species.

Floral structure:

 

Significant features:  'Advanced' floral features include apetaly, 3-merous (monocot-like) whorls in the calyx and androecium with adnation to form an hypanthium; the gynoecium is reduced to a single carpel and the contents of this further reduced to a single ovule.  The anthers also show a strange, valvate dehiscence (see drawings from Kohler's Medicinal Plants in the image gallery)

Sassafras albidum - flowers at anthesis - select photo to take a look at the anthers

 This family demonstrates that specialized  and derived features occur as a mosaic, i.e., all derived floral structures are not linked to herbaceous elements of the Subclass.  Also, as indicated by Jones and Lucksinger, elements of this family have interesting economic and ethnobotanical connections.  Especially topical, "According to Greek Legend, the large evergreen shrub, Laurus nobilis (type genus - Laurel) was saced to Apollo, and branches were woven into crowns for victors in the ancient Olympic games."  Like many elements of the Subclass, this family is known for the production of volitle oils and we encounter these in cinnamon (Cinnamomum zeylanicum) and the 'root beer' essence of Sassafras albidum  which is present in the Texas flora.  The typical fruit type for the family - a drupe - is encountered with the avocado (Persea americana) - the exocarp is peeled, the mesocarp  is fleshy, and the endocarp is reduced to a thin, brown covering of the avocado seed.

More information on the Lauraceae


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