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.
The habitat of this Galium is dry rocky hills, pastures, limestone hills. The habit is ascending or erect. The stems are rigid, smooth, hairless, or downy below, numerous, slender, square, branched. The leaves are 6-8, in a whorl, narrow, stiffer, awned, with a long, narrow point, slightly rolled back at the margins with a slender prominent midrib, with marginal hairs, spreading or turned back. The flowers are in loose cymes, narrowed above, white, few, erect to spreading, with acute petals. The fruit is granulate. The plant is 6-10 in. high, flowering from June to August, and is a herbaceous perennial.
The habitat of this species is dry banks in limestone districts, chalk downs, banks, and pastures. The habit is prostrate or ascending. The root is spindle-shaped. The stems are numerous, hairless, tufted, with ascending branches. The lowest leaves are inversely egg-shaped, the intermediate ones inversely egg-shaped to lance-shaped, the upper lance-shaped, narrowed, mostly linear and unequal, 4 in a whorl, 2 smaller, close set, rigid, blunt-pointed, bent back, not fringed with hairs. The flowers are pink in a loose cyme, the corolla covered with wartlike knobs outside, white within. The fruit is small, warted, wrinkled. The plant is 6-10 in. long, flowering in June and July, and is a herbaceous perennial.