Harmsiopanax ingens

Species of flowering plant

Harmsiopanax ingens of the Gensing, or Ivy Family (Araliaceae), is a very spiney palmlike mesocaul tree endemic to the montane rainforests of central New Guinea which bears a terminal rosette of deeply lobed, meter-wide dentate margined, peltate leaves, maple-like in shape, on equally long petioles. It ultimately attains a height of eighteen meters, at which point it bears a huge panicle of flowers five meters high and equally wide; the largest above ground inflorescence of any dicot plant (although Caloncoba flagelliflora and Ficus geocarpa and Ficus unciata var. strigosa have larger subsurface panicles, each about nine meters in length. H. ingens' panicles are very unusual; the ultimate twigs being spikes each bearing about fifty tiny umbels, each umbel with 8 to 20 minute flowers. So panicle, spike and umbel are all represented in a single inflorescence. Harmsiopanax ingens is monocarpic, and again the largest such plant among dicots. H. ingens was discovered in 1973 by W. R. Philipson. Its native name is "makua".

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