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.
(Greek, horned stigma). Plum-baginacese. Diffuse glabrous perennial herbs or sub-shrubs, one of which is in cultivation as a bedding and border plant.
Ceratostigma differs from Plumbago in having no glands on the calyx, stamens adnate to the corolla-tube, flowers in dense clusters rather than spicate, and other technical characters: leaves alternate, lanceolate or obovate, more or less ciliate: flowers mostly in terminal heads, blue or rose; calyx tubular, deeply 5-parted, the lobes narrow; corolla salver-shaped, the tube long and slender, the limb spreading and with 5 obovate obtuse or retuse lobes; stamens 5, attached on the corolla-tube: fruit a 5-valved caps, inclosed in the calyx. - Species 4 or 5, in N. China, Himalayas, Abyssinia.
Bunge (Plumbago Larpentae, Lindl. Valoradia plumbaginoides, Boiss.). Herb, 6-12 in., the stem red and branchy: leaves entire, strongly ciliate on the edges: flowers with a deep blue limb, the 5 lobes minutely toothed, collected in dense heads or umbels. China. B.M. 4487. F.S. 4:307. - A hardy bedding plant, producing profusely of its deep blue flowers late in fall; very valuable. Needs covering in winter in the N.
Under the name C. Polhilli, a dwarf and creeping shrub, with delicate lavender flowers, is mentioned in British journals as coming from high elevations in W. China and giving promise as an outdoor subject. L H B