search for: dwarf_shrub

...opulus tremula,2 Populus tremula,3 Calluna vulgaris,1 Calluna vulgaris,2 Betula alba,1 Betula alba,2 Betula alba,3 Primula veris,1 Primula veris,2 and another df where each species only have one row: species,growth_form Populus tremula,tree Acer platanoides,tree Ribes rubrum,shrub Calluna vulgaris,dwarf_shrub Betula alba,tree Primula veris,herb ...how can I create a new column in the first data frame where growth form is picked up from the second data frame (also factors) and entered into all rows for a species as follows: species,phase,growth_form Populus tremula,1,tree Populus tremula,2,tree Populus...