The past, present and future tasks of Hungarian dendrological research.
Hungarian dendrological research (research of living woody plants) has more than 200 years old history; the first general work by János Keresztély Grossinger was published in 1797. Further basic works in our time yet are: Forest Botany by Lajos Fekete and Sándor Mágócsy-Dietz (1896); and the chorological work, Distribution of trees and shrubs of sylvicultural importance in the region of Hungarian State by Lajos Fekete and Tibor Blattny (1913). A few dendrologists and many botanists have helped to get better knowledge of Hungarian dendroflora. From the point of view of taxonomy, chorology and habitat - which are interested by field botanists - it can be said that knowledge is fairly heterogeneous. There are sufficient information about most of the rare (protected/endangered) woody plants (an about 50 species) and the important adventives, above all invasive trees and shrubs (an about 10 species). From these two groups beyond there are only few taxa which can be said thoroughly worked up and known (e.g. Castanea sativa, Cornus mas, Fraxinus spp., Quercus spp.). List of the dendrotaxa, hardly known in the above-mentioned point of view is rich in species that are important for forestry or horticulture (e.g. Alnus glutinosa, Acer spp., Betula pendula, Corylusavellana and most of Salix spp.), supplemented with other species (e.g. Clematis vitalba, Colutea arborescens, Lonicera xylosteum, Padus avium, Sambucus nigra, Staphylea pinnata, Viburnum spp.).Followings can be asked from our field botanists: i) look for a specialist in cases of critical dendrotaxa; ii) a circumspect identification is necessary - especially in the case of leaves - by right of great number of samples from the adequate part of shoot; iii) keep in view frequent hybridization (e.g. in the case of Betula, Crataegus, Pyrus, Tilia), and frequent appearance of hybrids (e.g. Betula × rhombifolia, Cerasus × eminens, Salix × rubens); iv) appearance of interim forms are usually typical in the cases of species classified into aggregate species (e.g. Quercus petraea agg., Qu. pubescens agg.); v) take intraspecific taxa according to various ecological demands, area, morphological differences into consideration; vi) culture variations cannot be treat as an equal with the species (e.g. Populus spp., Salix spp.); vii) natural ↔ artificial area have to be separated; viii) lend a helping hand in getting taxonomical knowledge of hardly known dendrotaxa.
Taxonomische Betrachtungen am Genus Prunus
Die Systematik der Pflaumen ruht auf sehr unsicherer Basis. Im allgemeinen stehen zwei Auffassungen gegenuber. Nach der einen handelt es sich um zwei verschiedene Arten, und zwar Prunus domestica L. s. str. mit deutlich blas gelbgrunen, immer langlichen Kronblattern und mit langlich-eiformiger Frucht, deren Steinkern sich vom Fruchtfleisch sehr leicht ablost, ferner P. insititia JUSLEN. mit mehr-minder runden, reinweisen Kronblattern und mit kugeliger Frucht, deren Stein sich vom Fruchtfleisch nicht lost. 
 
 
 
Nach der anderen Auffassung werden alle Kulturpflaumen in eine Art, und zwar P. domestica L. s.l. vereinigt und die Kultursorten als Unterarten derselben betrachtet. 
 
 
 
Auf Grund der Untersuchung lebendigen Materials von etwa 400 Sorten in bluhendem Zustand stellte es sich heraus, das tatsachlich zwei Stammarten zu unterscheiden sind, das also die erste Auffassung stichhaltig ist, und die meisten Sorten der Kulturpflaumen Bastarde der P. domestica mit P. insistitia sind, die einzelnen Sorten bzw. Sortengruppen als die verschiedenen Nothomorphen derselben Bastard-Kombination anzusehen sind. Die sog. Mirabellen sind dagegen durch Hybridisation der P. domestica L. s. str. mit P. cerasifera EHRH. entstanden. 
 
 
 
All dies soll in der Nomenklatur zum Ausdruck gebracht werden.
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