4<i 2f)S 



WIhmi it i-. :i weil i'>t:ilili>li('il iMistmii lu ;iliriili;i' :i iiMiiii' in aiiiitiu'i' iiiaiiiii'r. it is liPi-t to 

 conforni to it (1,. lui- Miiimciis, DC. for l)i' CiikIoIIi', St. -Mil. t'i>r Saint-IIilaii-c). 



In pnlilicatii)ns ck'stini^d for thc f,'enoral inililic aiul in titlcs it is prefi'i'alilc niit to aliridgp. 



Section (1. On names that are to be retained when a group is divided, 



remodelled, transferred, or moved from one rank to another, or ^vhen two groups 



of the same rank are united. 



Art. 44. A cliaiige ot cliaracters, or a revision which invülve:^ tlie exclusion 



of certain éléments of a grouj) or tlie addition of new elenient,s. does not warrant 



a change in the name or nanies of a group, except in cases provided for in article öl. 



Exaii)|)les. — Thc goiius Myowtis as revi.seil liy R. liiown iliffors froni tlic original frcniis of 

 Linnaeus, but the name has not hcon changcd, nor is any change allowable. Varions autliors liavo 

 united witli Centaurca Jacca L. one or two spocies which Linnaeus had kept distinct; the group tluis 

 constituted must be called Ceiitnurea Jacea L. (sensu ampl.) or Centaurea Jacea L. (eni. Visiani, ein. 

 (iodron, etc.); the création of a new name such as Centaurea vulgaris Godr. is superfluous. 



Art. 45. Wlion a genus is divided into two or niorc gênera, the name must 

 be kept and given to one of the i»rincipal divisions. If the genus contains a section 

 or some other division which, judging by its name or its species. is the type or the 

 origin of the group. the name is reserved for that part of it. If tliere is no such 

 section or subdivision, but one of the i)arts detached contains a groat niany more 

 species than the others, the name is reservetl for that part of it. 



Exam])h's. — The genus Helianthenmm contained, according to Dunal (in DC. Prodr. I. 

 266 — 284 [1821J), 112 well-kiiown species distributed in nine sections; several of tliese sections hâve 

 since been raised to generic rank (Fumana S])acli, Tubcraria Spach) but the name llelianthcmum ha.s 

 been kept for the divisions grouped round the section Euhelianthcmum. — Tlie genus Convolvulus 

 L. em. .lacq. was divided into two by Rol)ert Brown in ISIO (Prodr. Jl. Xov. lloll., p. 482— 4.S4), 

 who gave the name Calystegia to one of the gênera which at that time contained only four species, 

 and reserved the name Convolvulus for the otlier genus which contained a niucli larger nuiidier of 

 species. — In the saine way Salisbury (in Tram. Linn. Soc. VI, :U7 [1802]), in separating liricn vul- 

 garis L. from the genus Erica, under the name Calluna, kept the name Erica for the large nunilier 

 of species left. 



Art. 4f;. When two or more groups of the same nature arc united. tho 

 name of the oldest is retained. If the names are of the same date, the author 

 chooscs, and lus choice cannot be moditicd by subséquent authors. 



Kxaniples. — Ilooker f. and Thomson (/•/. hid. \\. 67 [1855]) united the gênera Ilorm,,, Kottb. 

 and Capcllia Hl.; they gave the natne IVormin to the genus thus formed because the la.st name dates 

 from 178H while Capcllia dates from 1825. — In case of tinion of the two gênera Cardamint and 

 Dentaria, which were founded at the same time by Linnaeus [Sp. PI. éd. 1, p. 653 and ()54 [175!!]; 

 Gen. PI. éd. 5, n. 726, 727) the collective genus must lie called Cardamine because that name was 

 chosen by Crantz (Class. Crucif., p. 12() [176".)]), who was the first to snggest the union. 



Recommendations. 



XXVI. .\utliors who bave to choose between two generic naines shoiild note the folli>wing 

 recommendations: 



1. Of two names of the same date to prefer the one which was fir>t accompanied by the 

 description of a species. 



2. Of two names of the same date, both .-iccoinpanied by di'scri]itions of sjiecies, to jirefer 

 the one, which, wheit tiie author niade bis choice, inchulcd tlie larger niuiilier of species. 



