Douglasia laevigata
Douglasia idahoensis
cliff dwarf-primrose, smooth douglasia
Idaho dwarf-primrose
prostrate, loosely covered with marcescent, gray to light brown leaves (becoming remote in age).
prostrate to ascending, with terminal, green leaf rosettes.
spreading, thin;
blade oblong-lanceolate or oblanceolate to spatulate, 5–20 × 2–6 mm, margins entire or slightly toothed, sometimes ciliolate, hairs simple, apex obtuse to slightly acute, surfaces glabrous.
erect, reflexed in age, succulent;
blade oblong to oblanceolate, 7–10 × 1–2 mm, margins entire, apex acute or obtuse, surfaces puberulent, glabrescent, hairs simple.
2–7 mm, elongating little in fruit, minutely hairy, hairs stellate and branched.
1–6 mm, elongating little in fruit, hairy, hairs simple and forked.
2–10-flowered, bracteate;
bracts 3–8, lanceolate to ovate, 3–8 × 1–3 mm, glabrous or sparsely hairy, hairs minute, branched.
2–7-flowered, bracteate;
bracts 5–9, lanceolate to ovate-lanceolate, 2.5–0.7 × 0.7–1.2 mm, with scattered, simple hairs.
2–15 mm.
3–7 mm.
calyx 6–7 × 3–4 mm, stellate-pubescent;
corolla rose-pink, violet in age, limb 8–15 mm diam., lobes 3–4 × 2–3 mm, margins entire or erose.
calyx 4–7 × 2 mm, with simple hairs;
corolla pink to magenta with yellow throat, limb 10–12 mm diam., lobes 3–6 × 4 mm, margins emarginate or entire.
= 36.
Douglasia laevigata
Douglasia idahoensis
Although the first collection of Douglasia laevigata was from the “Mountains near Mt. Hood,” the original description of the species was based on plants collected in the Columbia River gorge, which thus represent the nomenclaturally typical variety (L. Constance 1938), even though that entity constitutes an ecological variant with almost glabrous leaves and loose umbels known only from the gorge. The widespread form, var. ciliolata, has more compact umbels and larger, more toothed, conspicuously ciliolate leaves. Because intermediate forms occur commonly, and even the type specimen of D. laevigata has cilia, the infraspecific taxa are not recognized here.
A population of Douglasia laevigata from Cone Peak in the Cascade Mountains of Oregon has been reported as heterostylous due to the occurrence of a protruding “pin type” stigma from the corolla throat; this represents only a local stigmatic anomaly functioning as minor spatial separation of anthers and stigma in early anthesis rather than true heterostyly as seen in Primula. No stigmatic or pollen dimorphisms occur in these plants and no parallel “thrum type” flowers are known.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Douglasia idahoensis is known only from a narrow region of northern Idaho. Its fleshy leaves and multiflowered inflorescence are distinctive. Morphologically and geographically, it is closest to D. laevigata; molecular genetic analyses show a closer relationship to D. montana. The single chromosome count of n = 18 for this species is somewhat questionable because it represents an anomaly for the genus, which typically has a base number of 19; this count should be verified.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
BC
OR
WA
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
