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| | Trochodendron aralioides - UBC Botanical Garden Forums |
 | | Cronquist (1988) and Takhtajan (1996) both accept these as monotypic families (Trochodendraceae, Tetracentraceae), the sole families in the order Trochodendrales. |
 | | APG (Angiosperm Phylogeny Group, 1998, 2003) also recognize the order Trochodendrales, but allow the option of recognizing both families, or both under a single family (Trochodendraceae, as that has priority). |
 | | This is a good example of the arbitrariness of taxonomic ranks such as 'family' and 'order' -- either scheme works here to provide a perfectly natural (phylogenetic) classification. |
| www.ubcbotanicalgarden.org /forums/showthread.php?t=6105 (746 words) |
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