PEDICULARIS FOLIOSA. L.
The Leafy Lousewort. Pédiculaire à épi feuillé. Reichbeblättertes Läusekraut.
The Yellow Auricula
(PRIMULA AURICULA)
Directly the snow melts up come the Auriculas, but only on limestone soil. The Auricula is really a spring plant, and usually flowers in May, but where protected by slowly melting masses of snow it may not bloom till much later; the accompanying photograph was taken in July. The thick, dense rootstock penetrates deep into the clefts of the rock. The leaves are smooth, rather fleshy, and of a bluish-green colour. The upper surface of the leaves, the flower-stalk and the calyx are covered with a white mealy substance. The leaves appear to serve the plant as a means of absorbing or storing water. Although the thick, dense cuticle usually present on leaves which have this function is here absent, they are found to dry up very slowly. It is probable that the thick cellulose walls between the individual cells replace the cuticle in the leaves of this plant. The flowers give forth a pleasant odour, something like that of the cowslip, but rather sweeter. Like the flowers of the primrose, they are of two kinds. The one has a long stigma which projects as far as the opening of the flower, and short stamens, and the converse is the case in the other. The object of this arrangement is to facilitate the pollination of the flowers by the agency of insect visitors as they pass from the one type to the other. Darwin found that very few seeds were formed when the flowers were self-fertilised.
The Auricula grows in rocky places between 3000 and 7000 feet. It is only found in limestone districts, and is rather local. It is also to be met with in the Jura, Dauphiny, the Pyrenees, the Carpathians, and in one or two places in the Black Forest.
The Auricula will be readily recognised. From the Oxlip (Primula elatior) and Cowslip (Primula officinalis or veris), it is distinguished by its smooth, not wrinkled, leaves and mealy stem. It is probable that most of the brilliantly coloured garden Auriculas were originally derived from this species.
Plate XXXV.