82 J. H. MAIDEN. 
Article 20. ‘However, to avoid disadvantageous changes in the 
nomenclature of genera by the strict application of the rules of 
nomenclature, and especially of the principle of priority in starting 
from 1753, the rules provide a list of names which must be 
retained in all cases. These names are by preference those which 
have come into general use in the fifty years following their 
publication, or which have been used in monographs and important 
floristic (floristiques) works up to the year 1890. The list of these 
names forms an appendix to the rules of Nomenclature.” 
Article 25, Recommendation v.c. ‘“‘Not to dedicate genera to 
persons who are in all respects strangers to botany, or at least to 
natural science, nor to persons quite unknown.” 
Recommendation vh. “Not to make names by the combination 
of two languages (nomina hybrida ). 
Article 26, Recommendation viii. ‘The specific name should, in 
general, give some indication of the appearance, the characters, 
the origin, the history or the properties of the species. If taken 
from the name of a person, it usually recalls the name of the one 
who discovered or described it, or was in some way concerned 
with it.” 
Recommendation ix. ‘‘ Names of men and women and also names 
of countries and localities used as specific names, may be substan- 
tives in the genitive (Clusi, saharew) or adjectives (Clusianus, 
dahuricus). It will be well, in the future, to avoid the use of the 
genitive and the adjectival form of the same name to designate 
two different species of the same genus (for example Lysimachia 
Hemsleyana, Maxim. (1891) and L. Hemsley, Franch. (1895)). 
Recommendation x. “Specific names begin with a small letter 
except those which are taken from names of persons (substantives 
or adjectives) or those which are taken from generic names (sub- 
stantives or adjectives). 
Examples: Ficus indica, Circaea fatetiana, Brassica Napus, 
Lythrum Hyssopifolia, Aster novibelgu, Malva Tournefortiana, 
Phyteuma Hallert.” 
+ See Appendix p. 87. 
