( ( Orchids ( are ( ( ( found ( in ( ( great abundance ) ( in ( the tropics ) ) ) ) ) , ) however ) ) ) ( , ( ( some species ) ( ( have ( been ( found ( in ( ( ( ( tundra , ) ( semi-desert areas ) ) and ) ( even ( arctic regions ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (S (NP (NNS Orchids)) (VP (VBP are) (VP (VBN found) (PP (IN in) (NP (NP (JJ great) (NN abundance)) (PP (IN in) (NP (DT the) (NNS tropics))))) (, ,) (ADVP (RB however))))) (, ,) (NP (DT some) (NNS species)) (VP (VBP have) (VP (VBN been) (VP (VBN found) (PP (IN in) (NP (NP (NN tundra)) (, ,) (NP (JJ semi-desert) (NNS areas)) (CC and) (NP (RB even) (JJ arctic) (NNS regions))))))) (. .)))
Orchids are found in great abundance in the tropics, however, some species have been found in tundra, semi-desert areas and even arctic regions.
(ROOT (S (NP (NP (DT Some)) (PP (IN of) (NP (NP (DT the) (JJS greatest) (NNS concentrations)) (PP (IN of) (NP (NNS species)))))) (VP (VBP are) (VP (VBN found) (PP (IN in) (NP (DT the) (NNS tropics))))) (. .)))