He also published two important books , Tentamen Floræ Nepalensis Illustratæ ( vols I-II , 1824-26 ) and Plantæ Asiaticæ Rariores ( vols I-III , 1830-32 ) , and went on numerous expeditions .
He also published two important books , Tentamen Floræ Nepalensis Illustratæ ( vols I-II , 1824-26 ) and Plantæ Asiaticæ Rariores ( vols I-III , 1830-32 ) .