84 ALPINE PLANTS 
CoTULA SQUALIDA.—This is a pretty little cut-leaved 
trailer, not unlike the Acenas. It hails from New Zealand, 
but is a useful and pretty plant for shady situations or 
for the crevices of stone paving. 
ERysImMuM.—These are small species of wallflower, first 
cousins, perhaps, of the Cheiranthus, dwarfer and smaller 
in bloom, but hardy and very free flowering. The colour 
of the flowers is yellow, generally pale and clear, but 
darker and richer in one or two species. There is an 
Armenian species named purpureum, with purple flowers, 
but it is rather uncommon, pumilum, rupestre, and 
ochroleucum helveticum being the more prevalent kinds. 
Thyrsoideum has whitish foliage, and pumilum, the dwarfest, 
is sweetly fragrant. Gravelly or sandy soil suits the 
Erysimums, and they will thrive on stony banks where 
many things would perish for lack of nourishment. 
EvupHORBIA.—Of quite distinctive character, very effective 
in foliage and quaint in floral arrangement, the Euphorbias 
are so attractive that they are sure to arrest the attention 
of even those of our visitors who are not keenly interested 
in rock plants. The stalkless leaves are in most species 
of thick, succulent appearance, and are arranged at precisely 
regular intervals and definite angles all along the thick 
flesh stems. Several are glaucous, almost to the extent 
of being blue, whilst a few are green, with conspicuous 
white or creamy mid-ribs. The flowers are mostly of a 
greenish amber or chrome yellow, arranged in flat umbels 
on short stalks. The actual flowers are backed with 
symmetrical leafy bracts, which constitute one of the 
several unique characteristics of the genus. E. cyparissias 
