A CLADISTIC-ANALYSIS OF THE POLLEN MORPHOLOGY OF THE TRIBE SWARTZIEAE(LEGUMINOSAE)

A cladistic analysis of the tribe Swartzieae (Leguminosae) is presente d using pollen morphological data. The data matrix comprises 11 pollen characters and 18 taxa (all 11 genera of the tribe Swartzieae and 4 o utgroup genera, i.e. Sclerolobium, Crudia and Michelsonia in the Caesa lpinioideae and Acosmium in the Sophoreae). Two polymorphic genera are subdivided for the analysis. Two analyses were conducted, one using e qually weighted characters and one using successive weighting. The unw eighted analysis yielded seven trees of length 18 steps and the strict consensus of these trees, although poorly resolved at the base, suppo rts a clads containing the tropical South American Aldina, Swartzia, C andolleodendron, Bocoa viridiflora, as well as the outgroup Caesalpini oideae genera Crudia and Michelsonia. Successive weighting yielded a s ingle tree which resolved a second clads comprising Acosmium, Bocoa (e xcl. B. viridiflora), Cordyla, Mildbraediodendron, the African species of Swartzia, Zollernia as well as a clads including the 3 South Ameri can genera. Lecointea, Exostyles and Harleyodendron. Baphiopsis has ve ry distinctive pollen with two autapomorphies. These results, based ex clusively on pollen characters, support recent work of Herendeen (in p ress) which suggest the Swartzieae is polyphytetic.