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- much branched perennial herb with a thick, deep, woody rooting
system; smooth stems grow to 1 metre; opposite, hairless, linear
leaves with a prominent mid-vein grow 2 to 10 cm long; small white
flowers are produced in diffusely branches clusters
- an escaped ornamental originating from Eurasia and now used
extensively in flower arrangements
- can produce over 13,000 seeds per plant
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