This site (translated) has info on Citrus genetic conservation, and Citrus x Microcitrus hybrids
homepage
http://translate.google.com/translate?hl=en&sl=ja&tl=en&u=http://extwww.cc.saga-u.ac.jp/~katayuki/HP-3/HTML/framepage1.html&prev=hp&rurl=translate.google.com

pics of hybrids
http://translate.googleusercontent.com/translate_c?hl=en&sl=ja&tl=en&u=http://extwww.cc.saga-u.ac.jp/~katayuki/HP-3/HTML/zatsyu.html&prev=hp&rurl=translate.google.com&usg=ALkJrhhEg2qx2NjDW8xgJL2b1LdEWke1_g

pics of unidentified strains ( click the blue number links )
http://translate.googleusercontent.com/translate_c?hl=en&sl=ja&tl=en&u=http://extwww.cc.saga-u.ac.jp/~katayuki/HP-3/HTML/midoutei.html&prev=hp&rurl=translate.google.com&usg=ALkJrhjOzy3KAkRNGPURzj_FAxvg9QBCFA

pics of " topics" hybrids and relatives
http://translate.googleusercontent.com/translate_c?hl=en&sl=ja&tl=en&u=http://extwww.cc.saga-u.ac.jp/~katayuki/HP-3/HTML/topics-1.html&prev=hp&rurl=translate.google.com&usg=ALkJrhiE40rc6_JSUIQTskiGHa6m_OM-Ew

pics of Monanthocitrus
http://translate.googleusercontent.com/translate_c?hl=en&sl=ja&tl=en&u=http://extwww.cc.saga-u.ac.jp/~katayuki/HP-3/HTML/monamtcitrus.html&prev=hp&rurl=translate.google.com&usg=ALkJrhgviLw4Y13UQs5fUicTU8G9vpW2Yw