i guess it didn't occur to me to just type a cultivar name since a lot of them are common to many species.
it did save what i typed: poinsettia 'pink me pink' and then 'euphorbia' and also 'euphorbia pulcherrima'.
so, may be it cannot marry common name with variety - i can accept that, but the other two should've picked it up, and they didn't.
same happened with my other searches, on aglaonemas, on coleus...on musa too. it's not just one case - it's for all 'special' databases : on proposal it displays a msg: that a database exists. if it displayed a msg like that based on species name 'in main section' that would alert me to go look elsewhere at least. i can check myself, i am not trying to create extra work for anybody, sorry.