98 ANNALS OF SCOTTISH NATURAL HISTORY 



confused, or rather perhaps replaced, it with the yellow rose. 

 There is no need to cite Hudson. M. Crepin says Rosa 

 Hailstoni of Baker belongs to duinalis, and the var. NicJiol- 

 soni, Christ, belongs to the invohita group. M. Crepin also 

 says R. c&sia, Sm. R. corrifolia, Fries ; but I do not think 

 Ley or Wolley-Dod agrees with this. Crepin was quite 

 confident about it. He also referred Baker's celerata to R. 

 glauca, Vill. 



958 bis. Pyrus scmipinnata, Roth. I omitted this as 

 being always a planted tree ; but I have since added it as 

 an alien. 



966. Crat<zgus OxyacantJia, L. This is well repre- 

 sented by several sheets in the " Linnean Herbarium," all 

 being what I call true C. OxyacantJia, L., i.e. monogyna, Jacq.; 

 which is really, I hold, synonymous. This species has much 

 the widest European range, and alone extends to Norway and 

 Sweden. The description in " Sp. PI." would cover both 

 species ; but the habitat and synonyms belong to the one- 

 styled plant. Our second species is C. oxyacanthoides,^\\\\\\\., 

 which is essentially a plant of Central and Eastern England, 

 scarcely reaching Scotland, except perhaps as an introduced 

 plant. I have never seen it there. It appears to be absent 

 from the Channel Isles. When the two species grow 

 together hybrids are very frequent. Such an area is Wych- 

 word, Oxfordshire, where, as in Whittlebury Forest, North- 

 amptonshire, the old thorns are often oxyacanthoides. This 

 plant, although sometimes growing in upland places, rejoices 

 in the clayey soil of river-valleys. 



1141. Silcr trilobnin, Crantz, is now extinct near Cam- 

 bridge. 



1267. Filago gennanica, L. " Syst. Nat.," ed. x., 1235, 

 !759> i- s > according to Mr. Britten, the authority ; but Mr. 

 F. N. Williams ("Prod. Fl. Britt.," p. 18) says the plant of 

 the " Systema " is not F.germanica, and refers to " Sp. PI.," 

 ed. 2, p. 131 I, 1763 ; but if he is correct about the "Sys- 

 tema," Hudson is the authority, as given in my List. 



1385. Surely Petasitcs ovatus, Hill, must stand. 

 Linnaeus had T. Jiybriila the female, and T. Petasitcs the 

 male plant. One being synonymous with the other, the choice 

 of his still-born name seems singularly unfortunate. To 



