White flowers, IX–X, in elegant spikes; very dark green foliage; vigorous ,upright; height 46–60cm; spread 46–60cm. Ideal for use as cut-flowers, but prone to fungal problems.
Finder unknown; introduced by R. Lyle (Alloa, Clackmannanshire, Scotland).
Name alludes to its flowers and flowering time; and after Ronald Lyle.