Thanks, ... As far as web pages are concerned, there is no standard convention.

Different sites like The Plant List, GRIN, Efloras, other sites follow their own conventions.

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..., you will never find binomials in Roman type, scientifical names have to be differentiated typographically

Accepted names are generally in Bold type (eFlora website) or Bold Itatics (GRIN, The Plant List) , nothing else

synonyms are in italics

You can't ignore scientific conventions.

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GRIN gives both Accepted names as well as synonyms in Bold Italics on its pages.

Pl. see http://www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl?3653

 

FOP gives synonyms in Roman type.

Pl. see http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=242101002

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See this

and entries under FOC and other Flora

Scientific names in Bold type, Bold italics or italics

It is good to choose one of these for Accepted names, and other for synonyms

No Roman type for scientific names. It can be used for cultivars (with cap initial)

It is important since now Online publications are accepted for describing new species names

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Thanks, ... I was telling that no fixed conventions are being followed on net.

GRIN (being most widely accepted since long) can not be called an exception

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