This section is from the book "Sub-Alpine Plants Or Flowers Of The Swiss Woods And Meadows", by H. Stuart Thompson. Also available from Amazon: Sub-Alpine Plants: Or, Flowers of the Swiss Woods and Meadows.
Somewhat like the last in habit, but pubescent, viscous, and greyish green in colour. Plant about 2 inches high, from a creeping root. Scape almost wanting or much shorter than the leaves, bearing a solitary bright rose flower. Leaves oboval, lengthened into a long foot-stalk, entire or crenate, velvety and very viscous. Calyx viscous, with oval, obtuse teeth. Corolla-tube twice as long as calyx. Capsule globular, shorter than calyx.
Rocks in the sub-alpine region of the French and Italian Maritime Alps. (Endemic.) March to May.
Leaves lanceolate or elliptic-lanceolate, acute, entire, glabrous, with cartilaginous margin, very shortly ciliated, dotted on the upper side. Umbels 1-5 flowered. Involucral bracts linear, equalling the flower-stalks. Calyx tubular-campanulate, shorter than the corolla-tube.
Stony pastures and limestone rocks descending to the lower Alps. June to August.
Eastern Alps (Southern Tyrol and Carniola).
Leaves on the lower parts of the stem imbricate, ending in a rosette about three-fourths the height of the stem, ovate; the upper ones broader, dentate, covered on both sides with glandular hairs; uppermost leaves small, scale-like. Scape 1-2 flowered, very short. Flower-stalks shorter than the scale-like bracts. Lobes of corolla bifid. Corolla bright rose-coloured. Leaves thick and succulent, with thickened cartilaginous teeth at the margin.
Southern Tyrol, on dolomitic limestone; rare. June.
A variable plant, whose nomenclature is rather involved. Stem 2-4 inches high, pubescent-glandular and viscid, like the leaves and calyx. Leaves roundish obovate, suddenly narrowed into a broad foot-stalk, crenate, dentate, very viscid. Flowers rose or rose-purple, fragrant, in umbels of 3-6, rather large, the tube being twice as long as the calyx. Pedicels longer than the oval in-volucral bracts. Calyx-teeth ovate, obtuse. Capsule shorter than calyx.
Shady, granitic rocks, and more rarely on limestone, banks, and roots of larch trees, etc., and occasionally on stony pastures, 5000-8500 feet; common; descending sometimes to the plains, as, e.g. at Vernayaz in the Rhone Valley and above Lake Maggiore. May to July.
Tyrol, Switzerland and Western Alps as far south as Provence; Pyrenees.
Though this plant is generally known as P. viscosa, under the Vienna Rules of Nomenclature that name should be given to the next species and this should be called P. hirsuta All.
A stout plant, 6-8 inches high, on a long, robust, cylindrical root-stock, covered with the scales of old leaves. Leaves broadly lanceolate or oboval, narrowed below into a long stalk, the whole being 4-6 inches long, toothed or crenate, pubescent, viscous. Flowers a beautiful purple-violet, not red or pink, fragrant, in umbels of from 3-20, and with unequal pedicels, longer than the involucre, with oval bracts. Calyx-teeth oval, glandular. Corolla-tube 3 times length of calyx. Capsule longer than the calyx. Somewhat variable in size and in the shape of the leaves.
Rocks and cliffs in the high mountains and sub-Alps up to 2000 metres; rather rare. May to July.
In Switzerland only in Grisons (Engadine and near Poschiavo), Western Alps from Savoy to Provence; Pyrenees.