Some such species are Blechnum boreale, Aira flexuosa, Calluna vulgaris, Vaccinium, Myrlillus, Rubus, Chamaemorus, Empetrum nigrum, Drosera spp. Some, at least, of these species possess mycorhiza in their roots, and are perhaps unable to live in soils where such organisms are absent.
Such are the crowberry (Empetrum nigrum), Trientalis europaea, Rubus saxatilis and the globe-flower (Trollius europaeus).
Myrtillus) and the arctic bramble (Rubus arcticus) extend very far northward; raspberries and red and black currants form a luxuriant undergrowth in the forests, together with Ribes dikusha in East Siberia.
The alpine flora, beginning at 6000 ft., is specially characterized by its rhododendrons, pines (Araucaria and Libocedrus), and palms, by numerous superb species of Agapetes (Ericaceae), and on the summits by an extraordinary association of species characteristically European (Rubus, Ranunculus, Leontodon, Aspidium), Himalayan, New Zealandian (Veronica), Antarctic and South American (Drymus, Libocedrus).
Geranium, Cardamine pratensis, mallows, Rubus, Oxalis, Epilobium, &c., but many species show more or less well-marked median symmetry (zygomorphism) as Euphrasia, Orchis, thyme, &c., and red, blue and violet are the usual colours.
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