, 
1907] On the Vienna Rules of Nomenclature 43 
Art. 36. On and after January 1, 1908, the publication of names 
of new groups will be valid only when they are accompanied by a 
latin diagnosis. 
Art. 37. A species or a subdivision of a species, announced in a 
work, with a complete specific or varietal name, but without diagnosis 
or reference to a former description under another name, is not valid. 
Citation in synonymy or incidental mention of a name is not effective 
publication, and the same applies to the mention of name on a ticket 
issued with a dried plant without printed or autographed diagnosis; 
Plates accompanied with analyses are equivalent to a description. 
but this applies only to plates published before January 1, 1908. 
Examples.— The following are valid publications: Onobrychis eubrychidea 
Boiss. Fl. or. II, 546 (1872) published with description; Panax nossibiensis 
Drake in Grandidier Hist. Phys. Nat. et Polit. de Madagascar, Vol. XXXV, 
t. V, III, 5e part., Pl. 406 (1896), published in the form of a plate with analyses; 
Cynanchum nivale Nym. Syll. fl. Eur. 108 (1854-1855) published with a refer- 
ence to Vincetoxicum nivale Boiss. et Heldr. previously ‘described. Hieracium 
Flahaultianum Arv.-Touv. et Gaut., published in an exsiecata accompanied 
by a printed diagnosis (Hieraciotheca gallica, nos. 935-942, 1903).— The 
following are not valid: Sciadophyllum heterotrichum Decaisne et Planch. 
in Rev. Hortic., ser. IV, III, 107 (1854), published without description or 
reference to a previous description under another name; Ornithogalum undu- 
latum Hort. Berol. ex Kunth Enum. pl. IV, 348 (1843), quoted as a synonym 
of Myogalum Boucheanum Kunth 1. c., the name adopted by the author, is 
not a valid publication; when transferred to Ornithogalum, this species must 
be called Ornithogalum Boucheanum Aschers. in Osterr. Bot. Zeitschr. XVI, 
192 (1866); Erythrina micropteryx Poepp. quoted as a synonym of Microp- 
teryx Poeppigiana Walp. in Linnaea X XIII, 740 (1850) is not a valid publica- 
tion; the species in question, when placed in the genus Erythrina must be 
called Erythrina Poeppigiana O. F. Cook in U. S. Dep. Agr. Bull. no. 25, p. 
57 (1901); Nepeta Steheana Hausskn. which appears without diagnosis in an 
exsiccata (W. Siehe, Bot. Reise nach Cicilien, no. 521, 1896), is not valid. 
Art. 38. A genus or any other group of higher rank than a species, 
named or announced without being characterised conformably to 
article 37 cannot be regarded as effectively published (nomen nudum). 
The mere indication of species as belonging to a new genus or of 
genera as belonging to a higher group, does not allow us to accept the 
genus or group in question as characterised and effectively published. 
An exception is made in the case of the generic names mentioned by 
Linnaeus in the Species Plantarum ed. 1., 1753, names which we 
associate with the descriptions in the Genera Plantarum ed. 5., 1754 
(See article 19). 
Examples. — The following are valid publications: Carphalea Juss. Gen. 
Pl. 198 (1789), published with a description; Thuspeinanta Dur. Ind. Gen. 
Phaner., p. X (1888), published with a reference to the genus Tapeinanthus 
