Table 1.

The approaches used for the description and discrimination of olive cultivars using morphological traits.

Year	Descriptors	References
1940	Fruits, leaves, inflorescences and endocarp	[29]
1950	Leaves, drupes and stones	[30,31]
1960
1970
1980	Whole plant, fruiting branches, leaves, inflorescences, fruits and endocarp	[32,33]
1990	Changes to the list of UPOV descriptors and addition of agronomic characters	[39,40]
2000	Plant passport data, qualitative and quantitative morphological descriptors	[41,42]
		[35,36]
2010	Morpho-geometric analysis on existing and fossil olive stones	[37]
	Analysis and image processing of leaves, fruits and endocarp
2020	High resolution imagery for analysis of olive canopy traits	[38]