Plant Of The Week - Rat-Eating Pitcher Plant

Nepenthes attenboroughii, or Attenborough's pitcher plant, is a montane species of carnivorous pitcher plant of the genus Nepenthes. It is named after the celebrated broadcaster and naturalist Sir David Attenborough, who is a keen enthusiast of the genus. The species is characterised by its large and distinctive bell-shaped lower and upper pitchers and narrow, upright lid. The type specimen of N. attenboroughii was collected on the summit of Mount Victoria, an ultramafic mountain in central Palawan, the Philippines.

In May 2010, the International Institute for Species Exploration at Arizona State University selected N. attenboroughii as one of the "top 10 new species described in 2009". The species appeared on the 2012 list of the world's 100 most threatened species compiled by the IUCN Species Survival Commission in collaboration with the Zoological Society of London.

Nepenthes attenboroughii was discovered by Alastair S. Robinson, Stewart R. McPherson and Volker B. Heinrich in June 2007, during a 2 month research expedition to catalogue the different species of pitcher plant found across the Philippine Archipelago. The expedition was initiated after missionaries reported seeing giant Nepenthes on the mountain in 2000.

The formal description of N. attenboroughii was published in February 2009 in the Botanical Journal of the Linnean Society. The herbarium specimen A. Robinson AR001 is the designated holotype, and is deposited at the herbarium of Palawan State University (PPC), Puerto Princesa City.

Further accounts of this species appeared in McPherson's Pitcher Plants of the Old World, published in May 2009, and in the December 2009 issue of the Carnivorous Plant Newsletter

The leaves are coriaceous and sessile or sub-petiolate. The leaves of rosettes are up to 30 cm long and 10 cm wide, whereas those of the scrambling stem are up to 40 cm long and 15 cm wide. The leaves are oblong to elliptic, obtuse at the apex and shortly attenuate at the base, clasping the stem by approximately two-thirds of its circumference and becoming decurrent for 2–3 cm.

Nepenthes attenboroughii produces some of the largest pitchers in the genus, sometimes exceeding those of typical N. rajah in size, but is not known to have exceeded the size and volume records set by that species. The largest recorded pitcher of N. attenboroughii measured more than 1.5 litres in volume, and traps exceeding 2 litres are likely to be produced on occasion. The lower pitchers are brittle and campanulate (bell-shaped), up to 30 cm tall and 16 cm wide and emerge from tendrils that are 30–40 cm long and 4–9 mm in diameter. The tendrils are flattened towards the leaf, making them almost semi-circular in cross section.

The upper pitchers are similar to the lower pitchers, but generally infundibular, to 25 cm tall and 12 cm wide.

The pitchers show considerable variation in both shape and coloration, ranging from green or yellow to dark purple throughout.

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