Preparation of a Floral Initiating Extract from Xanthium

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Science  17 Mar 1961:
Vol. 133, Issue 3455, pp. 756
DOI: 10.1126/science.133.3455.756


An extract from lyophilized tissue of flowering Xanthium (cocklebur) plants initiates floral development when applied to Xanthium test plants maintained on long-day photoperiodic conditions. Details of the preparation of the extract are described.