What kind of information are you needing regarding these species? Here is a start, but I strongly encourage you to explore on your own, you will learn more than I offer here.
D. broomensis is a member of the petiolaris complex native to Northern Australia. Cultivation is typical for the Petiolaris complex (think HOT)
D. closterostigma is a member of the Pygmy Drosera species. This is a relatively easy grower under typical pygmy care, but with attention to a dry summer dormancy.
D. kaieteurensis is a South American species, seldom seen in cultivation. It requires tropical culture and high humidity, and is suited for terrarium culture.
D. x thelocalyxiana is the illegitimate name for the fertile hybrid cross of D. burmannii x D. sessilifolia. D. burmannii is a Australioasian species while D. sessilifolia is its South American counterpart. Both are tropical species, and tend to be relatively short lived in cultivation, which I assume is true of the hybrid offspring.
A good websearch with provide you with additional information using the Latin binomial (correctly spelled) along with the additional search parameters: habitat, cultivation, photos....
Photo's may be seen via Bob Z's website at:
http://www.humboldt.edu/~rrz7001/
Information regarding the type collection and other information on legitimately published species may be found in the CP Database:
http://www.omnisterra.com/bot/cp_home.cgi
There is much to be said about each species. If you can be more specific, I can offer more details.