Lardizabalaceae

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Isoëtes

Decaisnea insignis

The Lardizabalaceae, consisting of approximately eight genera and 45 species, is a family of twining (rarely erect) shrubs found in temperate areas of Eastern Asia and South America. The family is characterized by alternate, palmate (rarely pinnate) compound leaves; regular unisexual flowers; six overlapping or valvate sepals (three in Akebia); staminodia or petals small or absent; three carpels (up to nine in Akebia); numerous ovules (four, by abortion, in Boquila) with laminar placentation (sub-marginal in Decaisnea and Sinofranchetia). Sargentodoxa and the two South American genera, Lardizabala and Boquila, are dioecious. All other genera are monoecious.

Figure 1. Most parsimonious phylogenetic trees resulting from a combiantion of atpB, rbcL, and 18S nrDNA sequence data. Numerals above branches indicate the number of nucleotide changes supporting each branch. Numerals below indicate the percentage of times that the branch was recovered in 1000 bootstrap replications and decay indices (how many additional steps are necessary before the branch collapses). Dotted lines indicate where branches collapse in the strict consensus trees derived from mutiple most parsimonious trees. Tree from Hoot et al, 1995b. Genera from Sargentodoxa down to Stauntonia are members of Lardizabalaceae; all other genera are outgroups.

This work was funded by the National Science Foundation

Bibliography:

Hoot, S. B., Culham, A., and P. R. Crane. 1995a. The utility of atpB gene sequences in resolving phylogenetic relationships: Comparisons with rbcL and 18S ribosomal DNA sequences in the Lardizabalaceae. Annals of the Missouri Botanical Garden 82:194-207.

Hoot, S. B., A. Culham, and P. R. Crane. 1995b. Evolutionary relationships of the Lardizabalaceae and Sargentodoxaceae: Chloroplast and nuclear DNA sequence evidence. Plant Systematics and Evolution (Suppl.) 9: 195-199.

Qin, H.-N. 1989. An investigation on carpels of Lardizabalaceae in relation to taxonomy and phylogeny. Cathaya 1: 61-82.