82 NEW ZEALAND PLANTS. 
leaves edged with red, and bunches of many small white flowers 
slightly rosy in the bud. Also two other plants characterize this 
association—herbaceous groundsels with leaves of great size, white 
underneath — Senecio lagopus (fig. 49) and S. saxifragoides. The 
distribution of these two species is one of the most remarkable 
cases of plant-distribution im the world. It has recently been 
most carefully investigated by Professor Arnold Wall. The two 
species, or more properly varieties of an aggregate species, differ 
85 Mt Hleasant 
Sugarloaf 0 ° LYTTELTON 
aypour 
Gss ~ e sil, es 
Cooper's we ° ees 2 
° 
3 Bila Castle » MtHerbert 
° Rock= ./° an ; 
“ Bo L yi Us Mt. Sinclair 
wed , Shee L o View Hilt | 
oy rx ° “Me (Apert. E pases 
oy ae ° Rocky Peak =) smi ee 4 
‘ ‘ a o° 
° © DUVAUCHELLE “L 
_ French Peak 2 
LITTLE RIVER o aL 
L. Ellesmere 
Carew Feako 
ed 
Mt Bossu © 
° 
AKAROA . 
° 
° ‘Stony Bay Peak 
pie 
° 
° 
Brazenose 
Map of Banks Peninsula and Port Hills, showing distribution of the two species of 
Senecio. lL, Senecio lagopus ; 8, Senecio saxifragoides ; A, rhyolite escarpment 
where S. lagopus occurs; B, rhyolite escarpment where neither species occurs. 
Trans. N.Z. Inst.] [After Wall. 
only in the degree of certain characters common to both—namely, 
the presence of “bristles”? on the leaf-blade and silky hairs on 
the leaf-stalk; but these differences hold good for each species. 
Now, as the above map shows, S. lagopus is confined to Banks 
Peninsula proper, and S. saxifragoides to the Port Hills. Such a 
