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.
(after David Douglas, the Scotch botanist, who explored California, Oregon and British Columbia in 1823 and 1829). Incl. Arelia. Primulaceae. Low tufted perennial herbs, one of which is used in alpine gardening.
The genus is closely allied to Androsace and Primula, but in those two genera the leaves come from the root, while Douglasia has branches, though very short ones, which are densely clothed with leaves Douglasia has a corolla-tube equaling or exceeding the calyx, somewhat inflated toward the top, with 5 scales or crests beneath the sinuses; calyx 5-lobed, persistent; stamens 5, included; ovary 5-ovuled: fruit a turbinate 1- or 2-seeded caps. - Seven or 8 species in mountains of Eu., and W. N. Amer., considered to be 6 by Pax & Knuth in Engler'a Pflanzenreich, hft. 22 (1905). The flowers are yellow in D. Vitaliana, which is the cult, species, but otherwise rose-purple. The plants require the treatment accorded to other alpines; see Alpine Plants, Vol. I.
Vitaliana, Hook. f. (Primula Vitaliana, Linn. Androdsace Vitaliana, Reichb. Aretia Vitaliana, Lodd. Gregoria Vitaliana, Duby). Height 2 in.: stems numerous, prostrate, somewhat woody: branches denuded of leaves at the base, but at the tips clothed with overlapping linear entire pilose leaves: flowers nearly stalkless, solitary or 2 or 3, yellow, rather large; corolla-tube 2 or 3 times longer than the calyx, the lobes ovate-lanceolate, obtuse. Alps, Pyrenees. L.B.C. 2:166.
Some of the American douglasias, all with rose or purple flowers, are sometimes listed by foreign specialists in alpines. - D. arctica, Hook. Glabrous: leaves ciliate with short and simple hairs, apex obtuse: flower 1 on a scape; corolla-tube about equaling calyx: plant loosely cespitose. High arctic Amer. - D. dentata, Wats. Like D. nivalin and by some considered to be a form of it, but coarser and with broader often spatulate leaves which are entire and sparingly denticulate. Cascade Mts., Wash. - D. laevigata, Gray. Mature leaves coriaceous, the margin smooth or rarely minutely ciliate, blade oblong or oblong-lanceolate and obtuse: flowers 2-5; corolla-tube almost twice as long as calyx. Ore., Wash. - D. montana, Gray. Mature leaves prominently ciliate on the margins, destitute of forked hairs, the blade very small and linear or lanceolate: flowers single, the corolla-tube less than the calyx or just equaling it. Mts., Wyo., Mont. Runs into several forms, 2 of which have been described as species (D. biflora, Nelson and D. or Androsace uniflora). - D. nivalis, Lindl. Mature leaves covered with minute 2-3-forked pairs, margins not ciliate, blade linear and usually entire: flowers 3-7, the corolla-tube hardly exceeding the calyx.
Columbia River. L H B †