Halo phytes.Plants which grow in very saline soils; e.g., Tr-iglochin iritimum, Salicornia spp., Zygophyllum cornutum, Aster Tnhum, Artemisia maritima.
In the south, in the Julianehaab district, even flowering plants, such as aster, nemophilia and mignonette, are cultivated, and broccoli, spinach, sorrel, chervil, parsley, rhubarb, turnips, lettuce, radishes grow well.
In some of the valleys having an outlet to the south the flora is partly peculiar to the American desert, and such species as Purshia tridentata, D.C., and Artemisia tridentata, Nutt., and species of Gilia, Aster and Erigonum are found that are not met with elsewhere.
Callistephus hortensis or chinensis (the China aster): half-hardy, 6 in.
The china aster is now one of the most popular of summer and fall plants.
Sea-aster flourishes in the Wadden of Friesland and Groningen, the Dollart and the Zeeland estuaries, giving place nearer the shore to sandspurry (Spergularia), or sea-poa or floating meadow grass (Glyceria maritima), which grows up to the dikes, and affords pasture for cattle and sheep. Along the coast of Overysel and in the Biesbosch lake club-rush, or scirpus, is planted in considerable quantities for the hat-making industry, and common sea-wrack (Zostera marina) is found in large patches in the northern half of the Zuider Zee, where it is gathered for trade purposes during the months of June, July and August.
In a group of plants of Aster prenanthoides, examined by G.
The following purely Caucasian species also grow on the coastfive species of spearwort, three of saxifrage, Aster caucasica, Dioscorea caucasica, Echinops raddeanus, Hedera colchica, Helleborus caucasica and Peucedanum caucasicum.