48 Rhodora | [Marcu 
Art. 48. When a subgenus or section or species is moved into 
another genus, when a variety or other division of a species is moved 
into another species, retaining there the same rank, the original name 
of the subgenus or section, the first specific epithet, or the original 
name of the division of the species must be retained or must be 
re-established, unless, in the new position there exists one of the 
obstacles indicated in the articles of section 7. 
Examples. — The subgenus Aljredia Less. (Syn. p. 6, 1832) of the genus 
Rhaponticum keeps its name when placed in the genus Carduus: Carduus 
sect. Aljredia Benth. et Hook. fil.; the section Vaccaria DC. of the genus 
Saponaria keeps its name when placed in the genus Gypsophila: Gypsophila 
sect. Vaccaria Gren. et Godr. — Lotus siliquosus L. Syst. ed. 10. p. 1178 
(1759) when transferred to the genus Tetragonolobus must be called Tetra- 
gonolobus siliquosus Roth Tent. Fl. germ. I. 323 (1788) and not Tetragonolobus 
Scandalida Scop. Fl. Carn. ed. 2, II, 87 (1772). — Betula incana L. Suppl. 
p. 417 (1781) when transferred to the genus Alnus must be called pue 
incana Willd. Sp. Pl. IV, 335 (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 Nigritella angustifolia Rich. in Mém. 
Mus. Par. IV, 56 (1818). The variety y micranthum Gren. et Godr. (Fl. 
France, I, 171 [1847]) of Helianthemum italicum Pers., when transferred as 
a variety to H. penicillatum 'Thib. retains its name: H. penicillatum var. 
a micranthum Grosser (in Engl. Pflanzenreich. Heft. 14, p. 115 [1903]).— The 
variety subcarnosa Hook. fil. (Bot. Antarct. Voy. I, 5 1847) of Cardamine 
hirsuta L., when transferred as a variety to C. glacialis DC., retains its name: 
C. glacialis var. subcarnosa O. E. Schulz (in Engl. Bot. Jahrb. XXXII, 542 
[1903]; the citation of an earlier synonym (Cardamine propinqua Carmichael 
in Trans. Linn. Soc. XII, 507 (isis) has no influence on the choice of the name 
of the variety (see art. 49). In all these cases, older but incorrect combina- 
tions n. give place to more recent combinations in which the rule has been 
observed. 
Art. 49. When a tribe becomes a family, a subgenus or a section 
becomes a genus, a subdivision of a species becomes a species, or the 
reverse of these changes takes place, and speaking generally when a 
group changes its rank, the earliest name (or combination of names) 
received by the group in its new position must be regarded as valid, 
if it is in conformity with the rules, unless there exist any of the obstacles 
indicated in the articles of section 7. 
Examples. — The section Campanopsis R. Br. Prodr. Fl. Nov. Holl., p. 
561 (1810) of the genus Campanula, was first raised to generic rank by Schrader,: 
and must be called Wahlenbergia Schrad. Cat. hort. Goctt. (1814), not Cam- 
panopsis O. Kuntze Rev. Gen. II, p. 378 (1891). — Magnolia virginiana L. 
var. foetida L. Sp. pl. ed. 1, p. 536 (1753), raised to specific rank, must be 
called Magnolia grandiflora L. Syst. Nat. ed. 10, p. 1082 (1759) not Magnolia 
foetida Sarg. in Gard. and For. II, 615 (1889). — Mentha spicata L. var. 
viridis L. Sp. Pl., ed. 1, p. 576 (1753) was raised to the rank of a species by 
Hudson, and must be called Mentha spicata Huds. Fl. angl. ed. 1, p. 221 
(1762) not Mentha viridis L. Sp. Pl., ed. 2, p. 804 (1763). — Lythrum inter- 
