Cryptocoryne esquerionii (Araceae), a remarkable new species discovered by a citizen scientist in Zamboanga Peninsula, southwestern Philippines

A species new to science, Cryptocoryne esquerionii Naive & Wongso from the island of Mindanao is herein described and illustrated. It differs significantly from all other Cryptocoryne species by its yellow, colliculate spathe with a long acuminate apex. A detailed description, colour plates, phenology, geographical distribution information and a provisional conservation status are provided. The discovery of this new endemic species further highlights the importance of the citizen science in exploring and conserving the Philippine biodiversity.