Predictivity vs Useful
peter.stevens at MOBOT.ORG
Wed Feb 16 19:12:03 CST 2005
>Yes, of molecular data.
>Were the new classifications (Plstyspermation to Alseuosmiaceae and
>Peridiscaceae) based on phylogenetic analyses? That is, were the
>by these (and related?) re-allocations hypothesized to be monophyletic?
>--- Peter Stevens <peter.stevens at MOBOT.ORG> wrote:
>> Not specifically addressing any of the points made, but I thought a
>> couple of (plant) examples might be of interest. These concern the
>> New Caledonian Platyspermation (previously very uncertain
>> relationships) going to the SW Pacific Alseuosmiaceae (Asterales) -
>> and when I went to look, distinctive indumentum, corolla margins,
>> etc. were in full agreement with new position. At least some of the
>> characters are synapomorphies for Alseuosmiaceae.
>> Two weeks ago during lab I looked at seed morphology/anatomy of a
>> couple of species of the African Soyauxia (ex Medusandraceae:
>> relationships unclear), but very recently (Davis and Chase) placed in
>> Peridiscaceae (tropical American: previously Malpighiales, but now
>> Saxifragales). It was very distinctive, with tanniniferous coat, the
>> cells being more or less collapsed, very tough endosperm with
>> massively thickened cells, etc. So I looked at a seed of Peridiscus
>> yesterday - almost identical. Unfortunately, there is no material of
>> Whittonia, the third genus.
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