Each plant has a unique composition of compounds. The main compounds present in a plant are carbohydrates, terpenoids, alkaloids, steroids, chlorophylls, carotenoids, phenolic compounds like flavonoid pigments, organic acids, lipids, amino acids etc.
For your species you first prepared extracts using solvents of different polarity then perform qualitative tests to know the class of compounds present in your sample. For this use can read my papers too. Hope it will be helpful to you.
The HPLC-DAD-ESI/MS(n) analysis of Jacaranda caroba revealed the presence of four dicaffeoyl acid derivatives and nine flavonoids, comprising quercetin, kaempferol and isorhamnetin derivatives. Twelve compounds are isolated from Jacaranda genus. Although isorhamnetin-3-O-rhmanoside-7,4'-di-O-glucoside and quercetin-3-O-(2-pentosyl)hexoside are the main metabolites in both aqueous and hydromethanolic extracts. Calendula officinalis contains saponins, polyphenols, chlorophyll, flavonoids resins, and essential oils.