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<I>Nepenthes</I> Section Blumea 62, 2018: 174–178 ISSN (Online) 2212-1676 www.ingentaconnect.com/content/nhn/blumea RESEARCH ARTICLE https://doi.org/10.3767/blumea.2018.62.03.03 Nepenthes section Insignes in Indonesia, with two new species M. Cheek1, M. Jebb 2, B. Murphy1, F. Mambor3 Key words Abstract A review of new data relating to Nepenthes insignis in Indonesia indicates that three taxa in section Insignes, not one, are present in New Guinea. One of these, endemic to the limestone of the island of Biak, is Biak formally named as Nepenthes biak and assessed as Critically Endangered; the other, from limestone of the Raja Critically Endangered Ampat islands is provisionally distinguished as Nepenthes sp. Raja Ampat, since only images are available. endemic limestone Published on 5 January 2018 Papua Barat Raja Ampat INTRODUCTION and amplified Rischer’s (1995) statement “The populations of N. insignis on Biak differ from those on mainland Papua in that This paper is one in a series leading to a monograph of the they produced pitchers and leaves which are shorter and nar- genus Nepenthes building on a skeletal revision of the genus rower than their mainland counterparts. The lamina is up to 26 (Jebb & Cheek 1997) and the account for Flora Malesiana cm long and 5 cm wide, and the pitchers are up to two-thirds (Cheek & Jebb 2001). While in 2001 only 85 species were ac- the size of the mainland plants, as well as generally narrower. cepted for the genus, today the figure lies at approximately 150. The coloration of the Biak plants is usually lighter and the upper In 2013, 12 new species were published from the Philippines pitchers often lack red pigmentation entirely. In all other re- alone (Cheek & Jebb 2013a–g). In the last few years our at- spects, the plants on Biak are identical to the plants on Papua”. tention has focussed on Indonesia, with new species described During a recent field visit to Indonesian New Guinea in June from Halmahera (Cheek 2015) and Sulawesi (Cheek & Jebb 2017, we had the opportunity to review data on Nepenthes, 2016a–b). Here we describe a new species from New Guinea, including Nepenthes insignis. The photographic data of the the first published from that island since 2011 (Robinson et al. ‘Biak variant’ showed that the upper pitchers are constricted 2011: 543). at the midpoint, quite unlike those of the N. insignis records Danser (1928:314) described N. insignis Danser, type species from the mainland, which are infundibuliform (funnel-shaped) of sect. Insignes Danser, from the then Netherlands Indies, as well as being more massive and stout. Inspection of the based on two specimens from the mainland of New Guinea, climbing stems shown in the online photographs referred to both from current Papua Province of Indonesia, N and S of above showed two other characters separating the Biak variant the central highland range (Jebb 1991). The species of sect. of N. insignis from that of the mainland population: 1) the stems Insignes are otherwise confined to the Philippines apart from a are cylindrical, not triangular in section; and 2) the leaf blades questionable outlier in Borneo (Cheek & Jebb 2001). Nepenthes are amplexicaul, not long-decurrent as wings for most of the insignis was refound in the wild by Rischer (1995) who noted length of the internode. Subsequently, we confirmed these point that it also occurs on Biak, an offshore island to the North: “the of difference in the Leiden duplicate of Kostermans & Soegang plants correspond in all respects but are generally somewhat 936, and in cultivated material from Biak at Kew (Cheek 18785). smaller”. (Rischer 1995). We accepted this statement in our These characters are more than sufficient to justify separate skeletal revision of Nepenthes (Jebb & Cheek 1997). It ap- species-status for the Biak plants, named in this paper as Ne- peared to be supported by a specimen at L from Biak Koster- penthes biak. Characters separating N. biak from N. insignis mans & Soegeng 936 (Jebb & Cheek 1997). However, at the are presented in Table 1. time, we did not examine the specimen in sufficient depth. An interesting feature of N. biak is that photos in the wild show This oversight was perpetuated in Cheek & Jebb (2001). Sub - both heavily purple-blotched upper pitchers, and, for example sequently, the ‘Biak variant’ of N. insignis has been photographi- on parts of the stem which have inflorescences, pure yellow cally recorded in the wild by several Nepenthes enthusiasts, in- upper pitchers. This same feature is seen in cultivated material cluding Andreas Wistuba (https://www.wistuba.com/nepenthes/ at Kew. In fact, this species has dimorphic and dichromic upper new-guinea/lowland/nepenthes-insignis-biak-irian-jaya.php, pitchers, referred to in the description below as primary upper accessed 31 Aug. 2017) and Alfindra Primaldhi (http://www. pitchers (those which are produced first, with purple blotches) arkive.org/pitcher-plant/nepenthes-insignis/image-G116821. and secondary upper pitchers (those produced further up the html, accessed 31 Aug. 2017). McPherson (2009: 1061) echoed climbing stems). 1 Herbarium, Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AE, Plants attributed to the ‘Biak variant’ were photographed in UK; corresponding author e-mail: [email protected]. the Raja Ampat islands to the west of Indonesian New Guinea 2 National Botanic Gardens, Glasnevin, Dublin 9, Ireland. 3 Herbarium Manokwariense, Universitas Papua, Manokwari 98314, West by Yin (2016) on an ‘ecotourist’ trip led by Chien Lee. These Papua, Indonesia. undoubtedly represent a further new species to science, and © 2018 Naturalis Biodiversity Center You are free to share - to copy, distribute and transmit the work, under the following conditions: Attribution: You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). Non-commercial: You may not use this work for commercial purposes. No derivative works: You may not alter, transform, or build upon this work. For any reuse or distribution, you must make clear to others the license terms of this work, which can be found at http://creativecommons.org/licenses/by-nc-nd/3.0/legalcode. Any of the above conditions can be waived if you get permission from the copyright holder. Nothing in this license impairs or restricts the author’s moral rights. M. Cheek et al.: Nepenthes section Insignes in Indonesia 175 Table 1 Characters separating Nepenthes insignis from N. biak. Nepenthes insignis Nepenthes biak Stems Triangular in section Cylindrical Leaves of climbing stems – decurrent to node below? Yes No (rarely decurrent by < 1/10 the length of the internode) Upper pitcher shape Infundibuliform Cylindrical-narrowly constricted in middle (frontal view) Lid length : breadth ratio c. 1 : 1 c. 4 : 3 Spur apex Entire, acute Shortly bifurcate Coloration of upper pitchers (lowermost) Yellow-green, lacking purple blotches Yellow-green, heavily blotched with purple No. longitudinal nerves on each side of the midrib 4–6 2(–3) Inner edge of peristome (upper pitcher) Shortly toothed Teeth absent the third species of sect. Insignes from Indonesia. This taxon Terrestrial climber to at least 3 m tall, indumentum of scattered is included in the key below as N. ‘Raja Ampat’. Unfortunately, red sessile glands 0.05 mm diam, inconspicuous, on all outer in the absence of an herbarium specimen, it cannot formally surfaces, glabrous apart from the tendril and pitcher (and be named. pro ba-bly the inflorescence). Rosette stems with lower pitch- ers only known from a photograph. Short stems not strongly MATERIALS & METHODS differentiated from climbing stems, with internodes cylindrical 6–7 mm diam, 2.5–4 cm long. Climbing stems as short stems, The methods used in this paper are as those documented in internodes 5 mm diam (hydrated material), 5.8–9 cm long, Cheek & Jebb (2013a–g). Materials used were images ac- axillary buds not conspicuous. Leaves of short stems spirally cessed online (at the sites indicated in the text above), the inserted, glossy, leathery, linear-narrowly oblanceolate, apex specimens studied and cited at K, BO and L, and three live rounded-acute, not peltate, base gradually attenuate, broader plants at the Tropical Nursery, RBG Kew, derived from seed than stem, clasping the stem for 3/5 its circumference, shortly collected on Biak in the 1980s by Robert Cantley (Borneo decurrent for 2–7 mm. Longitudinal nerves 2(–3) pairs on Exotics) and later donated to RBG Kew in 2002 and 2003, as each side of the midrib in the outer half, pennate nerves nu- N. insignis. These have the accession numbers 2003-2747 merous, arising at c. 60° from the midrib; nerves conspicuous (one plant) and 2002-896 (two plants). From the last, herbarium only in dried specimens. Leaves of climbing stems as short specimens were made that form the nomenclatural type of stems, but generally shorter and narrower 16.4–17.5(–26.5) N. biak. Herbarium citations follow Index Herbariorum (Thiers by 2–2.9(–4.8) cm. Lower pitchers (tendril vertical, uncoiled; et al. continuously updated) and binomial authorities IPNI (con- fringed wings) seen only in photos of seedlings in the wild tinuously updated). The conservation assessment was made – small ovoid-cylindric. Intermediate pitchers (tendril arising using the categories and criteria of IUCN (2012). Herbarium laterally from pitcher base, uncoiled) variable in shape and material was examined with a Leica Wild M8 dissecting binocu- size, from those resembling the lower pitchers in being partly lar microscope fitted with an eyepiece graticule measuring in with fringed wings, etc. to those which are larger, resembling units of 0.025 mm at maximum magnification. The drawing was the primary upper pitchers.
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