( ( Most ( aspen stands ) ) ( ( are ( clones ( of ( ( one or ) ( several ( sexually ( produced individuals ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJS Most) (NN aspen) (NNS stands)) (VP (VBP are) (NP (NP (NNS clones)) (PP (IN of) (NP (NP (CD one)) (CC or) (NP (JJ several) (JJ sexually) (VBN produced) (NNS individuals)))))) (. .)))
Most aspen stands are clones of one or several sexually produced individuals.
(ROOT (S (NP (JJS Most) (NNS reptiles)) (VP (VB reproduce) (ADVP (RB sexually))) (. .)))