Sebastian Kennerknecht / Spurge (Euphorbia cactus) cactus on plateau, Hawf Protected Area, Yemen

Sebastian Kennerknecht / Caralluma (Caralluma quadrangula) succulent plant on plateau in sandstone desert, Hawf Protected Area, Yemen

Sebastian Kennerknecht / Dhofari Jatropha (Jatropha dhofarica) on cliff edge over cloud forest, Hawf Protected Area, Yemen

Sebastian Kennerknecht / Hop Bush (Dodonaea viscosa) shrubland at sunset, Hawf Protected Area, Yemen

Mark Moffett / Kalanchoe Plant (Kalanchoe farinacea) flowering, Homhil, Socotra, Yemen

Sebastian Kennerknecht / Cloud forest and sandstone cliffs, Hawf Protected Area, Yemen

Sebastian Kennerknecht / Cloud forest covering rocky outcrops, Hawf Protected Area, Yemen