c, se United States, Mexico, West Indies, Central America, South America, Pacific Islands (New Zealand), introduced elsewhere in Pacific Islands, Australia.
Genera 2, species 3 (1 in the flora).
Works by B. Oxelman et al. (1999) and S. J. Wagstaff (2004) are followed in circumscribing Tetrachondraceae as comprising two formerly disparate genera, Polypremum and Tetrachondra Petrie ex Oliver. Oxelman et al. found evidence from rbcL and ndhF analyses supporting their membership in a clade within the Lamiales. This was confirmed by B. Schäferhoff et al. (2010) from analyses using trnK/matK, trnL-F, and rps16 sequence data.
Polypremum and Tetrachondra have generally been placed in different families. Tetrachondra, a genus of two species with sessile leaves and flowers with a superior ovary and gynobasic style, known only from Argentina, Chile, and New Zealand, was first placed in Crassulaceae (where its two-carpellate ovary was anomalous) by W. W. Hamilton in 1885 (S. J. Wagstaff 2004). C. Skottsberg (1912) thought it might be best treated as a unigeneric family near the Lamiaceae; A. Cronquist (1981) placed it within the Lamiaceae. Polypremum has often been placed in the Buddlejaceae, Loganiaceae, or Rubiaceae (see G. K. Rogers 1986).
A. L. Takhtajan (2009) followed L. Watson and M. J. Dallwitz (http://delta-intkey.com) in recognizing Watson’s unigeneric, unpublished Polypremaceae, which Reveal published in 2011.
|Author||Richard K. Rabeler + and Craig C. Freeman +|
|Authority||Skottsberg ex Wettstein +|
|Common name||Tetrachondra Family +|
|Distribution||c +, se United States +, Mexico +, West Indies +, Central America +, South America +, Pacific Islands (New Zealand) +, introduced elsewhere in Pacific Islands + and Australia. +|
|Illustration copyright||Flora of North America Association +|
|Illustrator||Barbara Alongi +|
|Reference||skottsberg1912a + and wagstaff2004a +|
|Source xml||https://email@example.com/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse grained fna xml/V17/V17 1412.xml +|
|Taxon family||Tetrachondraceae +|
|Taxon name||Tetrachondraceae +|
|Taxon rank||family +|
|Volume||Volume 17 +|