: Writingsfrom the Readership Nepenthes attenboroughii A NEW SPECIES OF GIANT PITCHER PLANT FROM THE PHILIPPINES Stewart McPherson • Dorset, Poole • UK • [email protected] Keywords: Nepenthes attenboroughii MountVictoria, Palawan, Philippines. , In June 2007, I was fortunate to visit the island of Palawan in the south of the Philippine archipelago with two friends and Nepenthes experts, Alastair Robinson and Volker Heinrich. We had previously received areport ofpopulations ofunknown highlandNepenthes from the summit ofalittle exploredpeakcalled MountVictoria, and afterreceiving permission fromthe provincial mayor, we found local hunters who would guide us up the remote mountain to at least as far as they could take us. On June 21st, after driving as far inland as possible, we began our trek, passing through dense, pristine, lowland rainforest and crossing many rivers into uninhabited and unknown terri- tory. Aftertwo days ofintense climbing, we reached the upper slopes ofthe mountain, and as the vegetation became increasingly short, at around 1600 meters (5249 ft) we suddenly saw one great pitcherplant, then a second, then many more. TheNepenthes bore spectacularwholly bell-shaped or infundibular lower pitchers (see Figure 1), up to 30 cm (11.8 in) tall and 16 cm (6.3 in) wide, with avolume up to 1.5 liters (1.58 qt). Each lowertrap sported yellowish green colouration, gen- erally mottled with dark red or purple colouration on the interior, the lower surface ofthe lid and on the peristome (see Back Cover). However, most young and newly opened pitchers were pure yellowish green. Our exploration of the summit of the mountain revealed that all populations of theNepenthes occurred in direct sunlight amongst windswept, stunted, uppermontane shrubs and scrub 1 metre (3.28 ft) tall or less. Most ofthe aged, mature plants had formed arigid, upright or scrambling stem up to 1.5 m (4.9 ft) long, reminiscent of N. rajah. We observed that the great m pitcher plants continued to the summit ofMountVictoria, which stands at 1726 (5662 ft), and so all populations naturally experience cool, humid, highland conditions year round. Unfortunately, one ofour guides suffered an injury, and we began our descent ofthe moun- tain the following day. But it was nevertheless clear that the Nepenthes we had observed repre- sented anew species and was one ofthelargestpitcherplants known. We hadreceivedpermission to collect herbarium specimens, and so collected and pressed one of the great pitcher plants. As we descended MountVictoria over the following two days, the three ofus agreed that we would name the new plant in honor of Sir David Attenborough, whose inspirational life works have inspiredgenerations towardabetterunderstandingofthebeauty anddiversity ofthenatural world. And so, Nepenthes attenboroughii was described in the February 2009 edition of the Botanical Journal of the Linnean Society. The herbarium specimens were deposited at the herbarium of Palawan State University, known by the acronym PPC in Index Herbariorum. An extensive account ofthe discovery and morphology ofNepenthes attenboroughii is pre- sented in my new, two volume, 1399-page workPitcherPlants ofthe Old World, which examines all species ofNepenthes known worldwide (see www.redfernnaturalhistory.com for more infor- mation). 100 Carnivorous Plant Newsletter Figure 1: A newly opened upper pitcher of Nepenthes attenboroughii. Note the temporary pure yellowish green colouration. The pitcher is likely to develop purple colouration as it ages. Photo by Stewart McPherson Volume 38 December 2009 101