4 Beiblatt zu den Botanischen Jahrbüchern. Nr. 70. 
Rules for Phytogeographical Nomenclature. 
Priority. 
I. Priority of term and of applieation is to be regarded as the funda- 
mental principle of phytogeographical nomenclature. 
Author. 
II. A term to be valid must be proposed by a botanist. 
Beginning. 
Ill. The beginning of phytogeographical nomenclature shall date from the 
adoption of this code. 
Publication. 
IV. Terms are valid only when published together with a definition or 
application. Publication, or republication with definition or appli- 
cation, must be made in Engler's Botanische Jahrbücher für Syste- 
matik, Pflanzengeschichte und Pflanzengeographie. 
Source of Terms. 
V. Terms are to be formed or taken from classical Greek or Latin. 
The former is to be preferred when words are to be compounded, 
the latter when simple terms are desired. 
Proper Construction’). 
VI. All hybrids and all terms which violate the principles of word-for- 
mation in Greek and Latin are invalid. Terms which exceed 
seven syllables, or are improperly spelled or transliterated are like- 
wise invalid. This rule is retroactive to the extent that words 
improperly formed, spelled or transliterated shall be made to con- 
form to classical usage. 
Vernacular Terms. 
VII. All vernacular terms are invalid, except as common or appositive 
terms in the language in which they are used. 
Similar Terms. 
VIII. Similar terms are valid only when they show a difference in stem, 
prefix, or suffix: mere differences of inflection or spelling are in- 
sufficient. 
Stability of Terms. 
IX. In the analysis of a process, structure, phenomenon, formation, 
factor, group or division, the original term is to be retained for 
the first, major, or general portion. 
A) Mitten, Waren, Scientific Names of Latin and Greek Derivation. Pro. Cal. 
Acad. Sci. III. 4, p. 415, 1897. 
