16 INTERNATIONAL RULES FOR BOTANICAL NOMENCLATURE 
aspera subsp. aspera), or bear a prefix (Alchemilla alpina subsp. 
eualpina), or be designated by some customary title (normalis, 
genuinus, typicus, originarius, verus, veridicus, &c.). These prefixes 
or terms lapse when the subdivisions are raised in specific rank. 
Article 47. When a species or subdivision of a Species is 
divided into two or more groups of the same nature, if one of the 
two forms was distinguished or described earlier than the other, 
the name is retained for that form. 
Examples. Genista horrida DC. Fl, Frane. iv. 500, was divided 
by Spach (in Ann. Sci. Nat. ser. 8, ii 258 [1844]) into three 
species—G. horrida DC., G. Boissieri Spach, and G. Webbii Spach; 
) 
Article 48. When a subgenus or section or species is moved 
to another genus, when a variety or other division of a species is 
original name of the subgenus or section, the first specific epithet, 
: 2d to the genus Alnus must be called 
In Willd. Sp. Pl. iv. 885 (1805), not Alnus lanuginosa 
Gilib. Exerc. Phytol. ii. 402 (1792). Satyrium nigrum L. Sp. Pl, 
ed. 1, 944 (1753), when placed in the genus Nigritella must be 
called Nigritella nigra Reichb. f. Ic. Fl. Germ. et Helv. xiv. 102 
(1851), not Nigriteila angustifolia Rich. in Mém. Mus. Par. ivy. 56 
(1818). The variety y micranthum Gren. et Godr. i 
171 [1847]) of Helianthemum.italicum Pers., when transferred as a 
variety to H. penicillatum Thib., retains its name—H.. penicillatum 
in E 
8 : 
Soc. xii. 507 [1818] ) has no influence on the choice of the name of 
the variety (see Article 49). In all these cases, older but incorrect 
