EEMARKABLE COLONY OF ALIEN PLANTS. 
9 
over so wide an area, that botanists have given them the rank of 
denizens or colonists. On the contrary, others are quite unable 
to maintain themselves in their new locations ; they cannot ripen 
seed in this climate, and, not producing descendants, they 
disappear. 
It would be manifestly unwise to encumber our books with 
names and localities for evanescent plants seen as single stragglers, 
or more numerously for a single season. “ Like ornaments on 
the breast of beauty, they add no intrinsic value to the spot 
where they sparkle.” The subjects of this note deserve notice 
mainly on account of their number, their long continuance, and 
the difficulty we find in ascertaining the cause of their introduction. 
Alien to Britain. 
Delj^hinium Ajacis 
Farsetia incana 
Erysimum orientaJe 
Saponaria Vaccaria 
Satureia liortensis 
TrifoUum supinum 
Grindelia squarrosa 
Centaurea paniculata 
C. melitensis 
Echinospermum Lappula 
Thesium humile 
Glaucium pliceniceum 
Camelina sativa 
Gilia capitata 
Silene dichotoma 
Gypsophila muralis 
Anthemis tmctoria 
Achillea nohilis 
Stachys annua 
Salvia syliestris 
Plantago are^iaria. 
Alien to the Bristol Coal-Fields, but Native or 
Colonists in other parts of the Country. 
Silene noctiflora 
Medicago falcata 
Apera Spica-venti 
Dianthus prolifer 
B up I e i I t 'um ro tundifo Hum . 
