This section is from the book "British Wild Flowers - In Their Natural Haunts Vol5-6", by A. R. Horwood. Also available from Amazon: A British Wild Flowers In Their Natural Haunts.
Helleborine atrorubens, Roehl. = H. ovalis, Bab. = H. atropurpurea, Druce. - The habitat of this plant is limestone cliffs, etc. The habit is like that of H. latifolia, but the plant is not so large. The stem is solitary. The leaves are small, egg-shaped to oblong, acute, the upper lance-shaped, the lowest bracts smaller than the leaves, longer than the flowers, but not so long as the fruit. The sheaths are funnel - shaped, close. The flowers are small, dingy-purple, dark-yellow to blackish-red. The stalk is shorter than the downy ovary. The label is oval, scalloped, acute, blunt-pointed, the hunches raised, folded, scalloped above. The plant is 6-18 in. high, flowering in July and August, and is a herbaceous perennial.