Pomatosace is a genus of flowering plant in the family Primulaceae, with only one species, Pomatosace filicula,[1] endemic to the Qinghai–Tibetan Plateau in China.
Pomatosace filicula is a biennial plant that grows from rosettes of basal leaves, each 15mm90mm long and 6- wide and divided into lobes along its length; the leaves may be reminiscent of a fern, providing the species' epithet, Latin: filicula (diminutive of Latin Latin: [[:wikt:filix|filix]], "fern"). The flowers are borne in umbels of 3–12 flowers on a stalk 1cm-16cmcm (00inches-06inchescm) tall. Each flower is white, with five petals fused into a tube for around 2mm. Seeds are produced in a capsule, which is approximately 4mm wide.
Pomatosace filicula is only found in the north-eastern part of the Qinghai–Tibetan Plateau, in the Chinese provinces of Sichuan, Xizang (Tibet) and Qinghai. It grows in a variety of habitats, including alpine meadows and sand flats along rivers, at altitudes of 2800-.[2] It flowers from May to June, and fruits from June to August.[2] It is thought to have evolved to inhabit the open ground in front of the burrows of plateau pikas (Ochotona curzoniae) and other ground-dwelling mammals.
Pomatosace filicula is the only species in the genus Pomatosace, as described by Karl Maximovich in 1881. More recent molecular phylogenetic data have shown, however, that Pomatosace is nested within Androsace,[3] meaning that some taxonomic change is required to maintain monophyletic genera – either sinking Pomatosace into Androsace or splitting Androsace into a number of genera.[4]