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Its stem is very irregular in form, owing to the crowding of the tubercles, which look as if they were filled with water. The spines are small, in tufts of about half a dozen, set in a little cushion of yellowish wool. In size, the whole plant is like E. Mackieanus, but it blossoms more freely, as many as sixteen flowers having been borne at one time by a plant at Kew.
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