Use subsp. for clarity

[Lyn Craven]

It is my experience that the non-systematic users of plant names frequently
are confused by "ssp.", many believing it to mean "spp."  It means 2 more
keystrokes, but is easier for those we serve, if we use the abbreviation
"subsp."
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Lyn Craven
Australian National Herbarium
CSIRO Division of Plant Industry
GPO Box 1600
Canberra,  ACT  2601
Australia

Phone  61-6-2465122
Fax       61-6-2465249