Royle
Description
Primula rosea is a western Himalayan alpine endemic distributed through northern India, Pakistan, Afghanistan and adjacent China, with GBIF recording around 255 occurrences, supplemented by numerous cultivated records in Europe and North America where it is grown as an ornamental. It is a true marsh-dweller of the high alpine zone, generally between roughly 3000 and 4300 m, the photographed plant coming from Khiar Kutti in Indian Garhwal at 4000 m, flowering in June at snowmelt. It grows in boggy alpine meadows, beside streams and springs, in seepage flushes and on wet turf, often forming spectacular rose-pink colonies as the snow recedes.
The species is a small, tufted, rosette-forming perennial herb with short rhizomes, the basal leaves developing fully only after flowering. These are oblong-obovate to oblanceolate, narrowed to a winged petiole, finely toothed and bright green, more or less glabrous and lacking the mealy farina of some congeners. The leafless scape bears an umbel of a few to several flowers; each flower is rich rose-pink to carmine with a contrasting yellow eye, the corolla salverform with a slender tube and spreading, notched lobes, and the species is heterostylous (pin and thrum). The fruit is a small capsule shedding numerous seeds.
Primula rosea belongs to section Aleuritia (the farinose primroses) within the large Holarctic genus Primula, though it is itself essentially efarinose. Its heterostyly enforces outcrossing by insect pollinators active in the brief alpine season. Locally abundant in suitable wet habitats and not globally threatened, it is nonetheless a habitat specialist whose marshy alpine flushes are sensitive to grazing, trampling and hydrological change.
Author: Royle · Sources: POWO (Kew), GBIF, Flora of Pakistan, Flora Simlensis, Flora of British India (Hooker), Richards Primula (monograph), Smith & Fletcher The Genus Primula