Abstract
The results of the study of English oak (Quercus robur L.) plus trees based on the morphological features of their leaves, acorns, and peduncles are presented. Samples were collected from both plus trees in forest stands and clones in clonal archive of English oak in Vinnytsia Region. In total, 41 trees were analyzed by 7 features of their leaves and 30 of those trees – by 9 morphological features of their acorns and peduncles. A point assessment was used for nonmetric indicators. 
 To compare plus trees by morphological features, the graphical method of morphotypes image representation with the usage of radar charts is suggested. Given that absolute indicators may depend on the year’s weather conditions, only relative indicators assessed in points were used to plot charts.
 The average indices for the trees as well as the variability level between them are determined. The most variable features were identified and offered to use for clone identification.
 It has been suggested that 8 plus trees whose leaves’ base is rounded are the hybrids of English and sessile oaks.
 It is confirmed that all the studied plus trees of Vinnytsia origin differed in one or several morphological features of their leaves, acorns, or peduncles. However, two plus trees of Odesa origin were similar in their leaves’ characteristics and two clones of Vinnytsia origin were similar in their acorns and peduncles’ features.
 It is noted that the use of morphological indicators of leaves and reproductive organs, taken as a whole, allows obtaining a rather complete description of a plus tree or its clone, and the usage of the graphical method allows determining the difference and similarity of individuals and their groups. Graphic images of morphotypes given as radar charts can be used to compare individuals, their groups, populations, variants in both progeny test and provenance trial, so to identify clones in clonal seed orchards.
Highlights
Morphological studies have always been a basis for a systematic approach in determining plant species and cultivars
We described certain patterns of individual variability by the leaf laminas’ shapes, by the form of clones’ acorns (Los & Borisova, 2002), as well as by the morphological features of the peduncles, inflorescences, and flowers (Los, 2009)
The variability of the leaf lamina width of individuals within the population was higher in most cases
Summary
Morphological studies have always been a basis for a systematic approach in determining plant species and cultivars. Despite a significant role of molecular methods, morphological methods are still of great importance (Ponton et al, 2004; Pochynok, 2012). We assume they will still be important in the future as well, due to a man’s. Data on plant species morphology is important enough for paleobotany (Denk, 2019). Clones and cultivars must be clearly different from any other cultivar by its morphological features (Lone, 2011; Singh, 2012; Chitwood et al, 2014). To simplify and unify making descriptions of cultivars, the International
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