Amaryllidaceae revision

Garak garak@code-garak.de
Sun, 19 Jan 2020 06:57:15 PST
So we're back at discussing in the open list? Mind your Adresses, Jane ;-)

Now that I've read it, here's what I get from that paper:

The trouble with tribe Hippeastreae is that it's not an achestral tree 
to describe, but a net of species - common ancestors  develop in 
different directions, split again and again, but also recombine via 
fertile hybrids that evolve into new species.

Lets sort this: lets say, two populations of the ancestor species ZERO 
are seperated and evolve into species A and B. Another flood, another 
landslide, both populations split again, forming over hundreds of 
generations the new species A1, A2, B1 and B2. Geographies change again, 
species A2 and B2 meet and form the extremly successful hybrid AB which 
replaces both parent species and over generations stabilizes as new 
species. In AB, a certain aspect of A is morphologically dominant, lets 
say several flowers over just one. The age of humans dawns, and we find 
the similar A1 and AB, and a different looking B1, thats why we say [A1 
and AB] is of genus A, [B1] is of genus B. That brings us through the 
age of morphology. But looking at DNA, we find clear traces of the B 
ancestor in AB. With the credo of monophyly, that each member of a genus 
has to share their ancestors, we cant define the [A1 AB] genus, because 
AB has an ancestor that is no anchestor of A1. So we can either give 
every species their own genus [A1] [AB] and [B1] or put them all in one 
[A1 AB B1], honouring the really ancient parent ZERO.

The Authors Garcia, Meerow et al are somewhat in favor of the latter one 
by reducing the varieties to Rhodolirium, Phycella,Traubia,Emerolirion 
(new),Hippeastrum and Zephyrantes, and removing Eithea, Placea, 
Rhodophiala, Habranthus and Sprekelia, leaving a subgenus system up to 
discussion which could be changed at any time without changing binominal 
designations. Still, they're pointing out that another team, 
Christenhusz et al (2018), has thrown the whole tribe into one Genus (so 
it could be worse), ignoring a few Meerow&Garcia papers of recent years 
- that's where the paper got (for me) a certain undertone of being 
miffed personally. So I, too, guess that this will stay in flux, maybe 
even up until some big authority develops a strategy for sorting out 
non-linear heritage. Lets just hope we won't end up with Genus Monocotia 
and Dicotia...

I stay with my proposal: write a page describing the discussion, but no 
reorganization of wiki pages yet - how are we to know if Meerow&Garcia 
will win over Christenhusz for now?

Martin


Am 18.01.2020 um 18:52 schrieb Jane McGary:
> First, note the spelling correction in the subject line. If you type 
> in your subject lines, please double-check so that archive searches 
> will turn up all the right posts. That's 50 years of editing speaking.
>
> I agree with Mary Sue's policy of waiting to see how widely revisions 
> become accepted. As she says, they should be noted in an edit to the 
> introductory paragraph of the relevant genus, with a citation of the 
> appropriate article or monograph. I haven't followed the meanderings 
> of the Scilla revision by Speta but must see what the current view is. 
> Some of his revisions made a lot of sense to me as a mere observer and 
> grower, such as Prospero for Scilla autumnalis and its close 
> relatives, but others seemed gratuitous (and who wants to call a 
> flower "Schnarfia"?).
>
> Jane McGary, Portland, Oregon, USA

-- 
Martin
----------------------------------------------
Southern Germany
Likely zone 7a

_______________________________________________
pbs mailing list
pbs@lists.pacificbulbsociety.net
http://lists.pacificbulbsociety.net/cgi-bin/…


More information about the pbs mailing list