Here are some links to all-electronic journals that might benefit from being able to publish new names of plants:

Carnets de Géologie/Notebooks on Geology (ISSN 1634-0744)

http://paleopolis.rediris.es/cg/

Insight

http://www.mpm.edu/cr/insight/insighthome.html

Palaeontologia Electronica on the World Wide Web (ISSN 1094-8074) [CD-Rom (ISSN 1532-3056)].

http://palaeo-electronica.org/

Phyloinformatics

http://phyloinformatics.org/index.php