Harmsiopanax ingens

Harmsiopanax ingens
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Apiales
Family: Araliaceae
Genus: Harmsiopanax
Species:
H. ingens
Binomial name
Harmsiopanax ingens
Philipson

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 (3.25-foot wide) dentate margined, peltate leaves (Sometimes not peltate), maple-like in shape, on equally long petioles. It ultimately attains a height of eighteen meters (59 feet), at which point it bears a huge panicle of flowers five meters (16.5 feet) high and equally wide; the largest above ground inflorescence of any dicot plant[1] (although Caloncoba flagelliflora (Achariaceae; of West Africa)[2] and Ficus geocarpa (Moraceae; of the Malay Peninsula)[3] and Ficus unciata var. strigosa (also of Malaya)[4] have larger subsurface panicles, each about nine meters (thirty feet) 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.[5] Harmsiopanax ingens is monocarpic, and again the largest such plant among dicots. H. ingens was discovered in 1973 by W. R. Philipson.[6] Its native name is "makua".[1]

References

  1. ^ a b W.R. Philipson, "A Revision of Harmsiopanax" BLUMEA Vol. 21 (1973) # 1 pp. 84-85
  2. ^ E. Gilg, "Flacourtiaceae", DIE NATURLICHEN PFLANZENFAMILIEN (2nd edition; 1925) Vol. 21 pp. 377-457.
  3. ^ "Moraceae - Ficus", FLORA MALESIANA Vol. 17 Part 2 (2005) pp. 40 & 461.
  4. ^ E.J.H. Corner, WAYSIDE TREES OF MALAYA (1952 edition) Vol. 1 p. 681.
  5. ^ Philipson,"Revision" loc. cit.
  6. ^ Philipson loc.cit.

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