Representative alpine plants from the Qinghai-Tibet Plateau. Top left, Spenceria ramalana
Trim. (Rosaceae). Top right, Pomatosace filicula
Maxim. (Primulaceae). Bottom left, Cyananthus formosus
Diel. (Campanulaceae). Bottom right, Allium wallichii
Kunth (Amaryllidaceae). Studies on phylogeography, cytology, and intraspecifi c differentiation of these plants are included in this special issue. Photographed by Hang SUN (top left), Bo XU (top right), and Yang NIU (bottom left and right). See details and studies on more alpine plants of the Qinghai-Tbet Plateau in this issue.