This section is from the book "The Standard Cyclopedia Of Horticulture Vol2", by L. H. Bailey. See also: Western Garden Book: More than 8,000 Plants - The Right Plants for Your Climate - Tips from Western Garden Experts.
(Latin, a little cross; from the arrangement of the leaves). Rubidceae. Crosswort. Hardy rock plants of minor importance.
Herbs, often woody at the base: branches usually long, slender, 4-cornered: upper leaves opposite, without stipules; lower leaves or all in whorls of 3 or more, linear or lanceolate, rarely ovate or obovate: flowers small, white, rosy or blue. - About 30 species, natives of the Medit. region and W. Asia. The genus is closely related to Asperula, and is distinguished by the flowers having bracts, not an involucre, and the style - branches distinctly unequal instead of nearly equal. The first species below has lately been referred to Asperula. It is of easy cultivation, preferring light, moderate loam and partial shade. A delicate plant for the front of borders, and capital for the rockery. Prop, chiefly by division, and also by seeds.
Trin. (Asperula ciliata, Rochel). Annual, prostrate, 6-9 in. high: leaves in whorls of 8 or 9, lanceolate, hispid: flowers small, crimson-pink, in round terminal heads 1/2in. diam.; floral parts in 5's; style club-shaped, long exserted, very shortly twice cut at the top. June-Aug. Persia. - Grown, and often acting in England, as a perennial.
Linn. Annual: lower leaves 6 to a whorl, linear, on an erect or sometimes branching, smooth stem: flowers white, in spike-like clusters, small, the petals sometimes short mucronate. Medit. region. July.
C. chlordstachys, Fisch. & Mey. Annual, rough and spreading, but the whole plant only 4-6 in. high: flowers small, in spike-like clusters. - C. glomerata, Bieb. (Asperula glomerata, Griseb.), has yellowish green flowers in many interrupted spikes. Palestine to Persia. Properly an Asperula. N Taylor.†