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The mucilaginous achenes ofArtemisia monosperma, a dominant perennial shrub in sandy deserts, germinate in light but poorly in dark. The deeper the achenes in sand, the lower and slower their germination. No seedlings emerged from deeper than 4cm, but seedlings emerged after removal of the upper 3cm or when exposed to light from below. In natural conditions seedlings emerge from a depth of 0·1 to...
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