44 206 



Examplps. — The' following :irp valid ]mlilioations: Carphalea .Tuss. Geti. PI. 198 (1789), 

 pul)lisli('il with a description; Thiispeinanta Dur. Imi. Gen. Phaner., p. X (1888), pvililished witll a 

 référence to the geniis 'J'apehianthiis Hoiss. previously descrilied ; Stipa L. Sp. PL éd. 1, 78 (1753|, 

 valid because acconipanied by a description in the Genera Plantarum éd. ô, n" 8-1 (1754). — The 

 following are not valid: Egeria Nerand (A'o/. Voy. Freycinet, p. 28 (182G), published »itliout diagnosis 

 or référence to a description previously made under another naine; Acosmiis Desv. nientioned inci- 

 dentally as a synonym of the genus Aspicarpa lücli. by l'e Candolle (Prodr. 1, 58:i [1824]); '/Mtarhendi 

 Forsk. FI. Aeg. Arai., p. CXV (1775), based mily mi the enumeration of ){ species of the genus 

 Ocimirm witliout indication of characters. 



Art. 39. The date of a iiame or of a coniliination of naines is tliat of tlieir 

 effective publication. In the aliscnce of jiroof to the contrary. tiie date ])hiced on the 

 worli containing tlie name or coniliination of nanies is regarded as correct. On and 

 after .lanuary 1", lüOs, üie date of i)ulilicatioii of the latin iliagnosis only can he 

 taken into account in (juestions of priority. 



Examiilcs. — .\/entha foliiconia Opiz was distriliuted by its author in 1832, but the name 

 dates froni 1882 (pulilislied by Déséglise Menth. Op. in />'«//. soc. étud. scient. Angers, 1881 — 1882, 

 p. 210j; Mentha bracteolala Op. Seznam, p. 65 (1852) without description, takes effect only from 1882, 

 when it was published with a description (Déséglise 1. c, p. 21 1). There is some reason for supposing 

 that the first volume of Adanson's Familles des Plantes was published in 17G2, but in absence of 

 certainty the date 170!? on the title-page is assunied to be correct. The différent parts of Willdenow's 

 Species Plantarum were published as foUows: vol. I, 1798; vol. II, 2, 1800; vol. III, I, 18(Jl; vol. 

 III, 2, 1803; vol. III. :i, 1804; vol. IV, 2, 1806: and not in the years 1797, 1799, 18(X), 18<X), 1800 

 and 1805 respectively, as would appear from the tille-page of the volumes: it is the earlier séries 

 of dates which takes effect. — The third volume of the Prodromus florae hispanicae of Willkomm & 

 Lange, the title-])age of which bears the date 1880, was ])ul)lished in four parts, ])p. 1—240 in 1874, 

 pp. 241— 512 in 1S77, pp. .'illi— 730 in 1878, p. 737 td the ciiil in 1880, and it is thèse dates which take effect. 



Recommendations. Botanists will do well, in Publishing, to conforni to the following 

 recommendations: 



XVIII. Not to publish a name without cle.-irly indicating whethcr it is llie name of a 

 faniily or a tribe, a genus or a section, a species or a variety; briefly, without (»xiiressiug an opinion 

 on tlie nature of the grou]) to which they give the name. 



XXI. To avoid Publishing or mentioning in their publications unpublished names which 

 they do not accept, es])ecially if the persons resi)onsible for thèse names hâve not formally antliorised 

 tlieir ])ublication (see Rec. XIV, e). 



XX. When Publishing new names in works written in w nuiileni langiiage (flor.i.s, cata- 

 logues etc.) to publish simultaneonsly the latin diagnoses which will niake the nanies valid from the 

 point of view of scientific nomenclature. 



XXI. To give the etymology of new goneric nanies and also of specific nanies when the 

 me.aning of the latter is not obvions. 



XXII. To indicate precisely the date of publication of their wurUs aiul that of the placing 

 on sale or the distribution of nanied and numbered plants when thèse are accom]ianied by printed 

 diagnoses. In the case of a work appearing in i)arts, tlie l.ist jinblislied sheet of a volume should 

 indicate the précise dates at which the différent fascides or [larts of tlie volume were published, .as 

 well as the number of pjiges in each, 



XXm. When works are published in periodicals to require the éditer to indicate on the 

 sejiarate coiiies the date (year and montli) of juiblication and also tlie title of the periodical from 

 which the work is extracted. 



XXTV. Separate cojiies should always bear the ])aginatioM of llie ju rimlical nf wliicb they 

 form a |iarf: if desired they may .also bear a special iiagiiiation. 



