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This species is accepted, and its native range is W. New Guinea.

[KBu]

Mustaqim, W.A., Utteridge, T.M.A. & Heatubun, C.D. (2019). Diplycosia papuana (Ericaceae: Vaccinioideae: Gaultherieae): a new endemic species from central New Guinea. Kew Bulletin 74: 68 doi:10.1007/s12225-019-9859-5

Conservation
Data Deficient (IUCN 2012). Recent data on the population size or label information are unavailable. Being a component of montane forest, however, this species may become susceptible to climate change in the future; this is one of most prominent environmental stresses in the tropical montane ecosystem (Raxworthy et al. 2008), as has been highlighted for the New Guinea highlands (Hope 2014). Further field research is required to provide adequate data to allow an adequate assessment.
Distribution
Indonesia: Papua Province, Central Ranges (Valentijn Mts), Yahukimo Regency. Only known from the type locality.
Ecology
Montane forest, on a limestone ridge; alt. 1,530 m.
Morphology General Habit
Epiphytic shrubs
Morphology Leaves
Leaves rather densely arranged, circular, 1.2 – 1.8 × 1.2 – 2.0 cm, length per width 0.9 – 1 (– 1.11) times, coriaceous, apex rounded, rarely obtuse, apical gland protruding at 0.5 – 0.6 mm from the edge of leaf apex, margin crenulate, revolute, teeth spaced 1.25 – 2 mm apart, marginal hairs setose, rather persistent, base broadly rounded; adaxial surface of lamina with subpatent bristles, persistent, abaxial surface clad with subpatent and persistent bristles, these not distinctly thickened at the blackish base; midrib impressed above, slightly raised below, gradually narrowing to apex; 3 (– 5)-plinerved, lateral pairs 1 (– 2) on each side of the midrib, slightly or obscurely immersed above, curved to the apex, lowest basal nerves from the base of the lamina, reaching about half of the lamina or sometimes obscure, lowest suprabasal arising at 1 – 2 mm from the lamina base, curving from a rather straight base, usually reaching the apex and anastomosing near the base of apical gland, rarely disappearing toward distal end, higher-order nerves inconspicuous
Morphology Leaves Petiole
Petiole subterete, upper surface flat, 1.5 – 3.25 × 1.25 mm, adaxial groove shallow, both sides with subappressed bristles, bristles blackish and slightly thickened at the base
Morphology Reproductive morphology Flowers
Flowers 4 – 5-merous
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 8 or 10, filaments linear, c. 1.5 mm long, slightly dilated at the base, S-shaped, glabrous, anthers ovate-oblong, c. 1.4 mm long including the short apical tubules, granular, base with patent and blunt apiculus
Morphology Reproductive morphology Flowers Calyx
Calyx tube turbinate, c. 1 mm long, rugulose, glabrous; lobes ovate-triangular, c. 2 × 2 mm, rugulose, apex obtuse to almost rounded, glabrous outside, margin fimbriate
Morphology Reproductive morphology Flowers Corolla
Corolla urceolate, c. 3.5 mm long from the base of the tube to the apex of lobes (after rehydration), tube 2.5 × 2 mm, glabrous on both surfaces; lobes ovate-triangular, c. 1 mm long, 1.25 mm wide at the base, apex acute, glabrous on both surfaces
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary shallowly lobed, glabrous
Morphology Reproductive morphology Flowers Gynoecium Style
Style cylindrical, c. 3 × 0.2 mm, glabrous
Morphology Reproductive morphology Flowers Nectaries
Nectary of 8 or 10 free lobes, twice the number of perianth segments, appressed to the ovary, oblong, c. 0.4 × 0.15 mm, blunt at apex
Morphology Reproductive morphology Flowers Pedicel
Pedicels curving, rather slender, 7 × 0.5 mm, smooth, covered with subappressed to subpatent bristles, hairs 1 – 1.25 mm long, base not thickened, blackish, persistent
Morphology Reproductive morphology Fruits
Fruit not seen.
Morphology Reproductive morphology Inflorescences
Inflorescence axillary, 3-flowered
Morphology Reproductive morphology Inflorescences Bracts
Basal bracts ovate, c. 1.25 mm long, glabrous dorsally, margin fimbriate; apical bracteoles ovate, 1.25 mm long, obtuse, outside with few appressed bristles, glabrous inside, margin fimbriate
Morphology Twigs
Twigs terete, slender, c. 2 mm diam. at the apex, with a few longitudinal fissures on the flowering parts, indumentum of subpatent bristles, varying in length, up to 3.25 mm long, base slightly thickened, blackish, persistent, fine hairs absent
Note
The epithet refers to the name of the type locality in Papua Province, the current geographical name of the Indonesian part of New Guinea. The floral parts are 4 – 5-merous and, in accordance with the ‘usual rule’ for the genus (Argent 2014), the number of stamens should be twice the number of perianth parts (i.e. calyx or corolla lobes), thus there will be 8 stamens in a 4-merous flowers and 10 in a 5-merous flower. In Diplycosia papuana, complete 4-merous flowers (with stamens present within the corolla) are available, but only a single 5-merous flower bearing five calyx lobes and with the corolla and stamens fallen off is included in the specimen. From this observation, we conclude that the number of floral parts ranges from 4- to 5-merous in this species. On the basis of this character, the species is close to D. varians, a species from the eastern part of New Guinea. However, the length of the corolla in D. varians is 8 − 9 mm in the dry state (reaching 10 − 11 mm when fresh), which is distinctly larger than that for D. papuana (corolla only c. 3.5 mm long). Plant exclusively bristly, the twigs without a fine short indumentum of hairs. Similar to Diplycosia varians Sleumer in having 4 – 5-merous flowers, but differing in the exclusively circular leaves and in its smaller flowers (calyx tube c. 1 mm vs 4 − 7 mm long, corolla c. 3.5 mm vs 8 − 9 mm long, filaments c. 1.5 mm vs 5 mm long and anthers c. 1.4 mm vs 2.8 mm long in D. varians).
Phenology
Collected in flower in February.
Type
Indonesia, Papua Province (Irian Jaya), Yahukimo Regency, Valentijn Mts, limestone ridge north of Angguruk, east-west orientated [4°15'S 139°25'E], 1,530 m, J.-M. Mangen 2194 (holotype BO!; isotypes A, E, L, LUX).

Native to:

New Guinea

Diplycosia papuana Mustaqim, Utteridge & Heatubun appears in other Kew resources:

First published in Kew Bull. 74(4)-68: 1 (2019)

Accepted by

  • Govaerts, R., Nic Lughadha, E., Black, N., Turner, R. & Paton, A. (2021). The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. https://doi.org/10.1038/s41597-021-00997-6 Scientific Data 8: 215.

Literature

Kew Bulletin

  • Argent, G. & Brunton, D. (1984). Some chromosome numbers in the Ericaceae. Notes Roy. Bot. Gard. Edinburgh 11: 561 – 564.
  • Argent, G. (2014). A contribution to the study of the genus Diplycosia (Ericaceae) in Sulawesi, Indonesia. Edinburgh J. Bot. 71(1): 83 – 115.
  • Fritsch, P. W., Lu, L., Bush, C. M., Cruz, B. C., Kron, K. A. & Li, D.-Z. (2011). Phylogenetic analysis of the wintergreen group (Ericaceae) based on six genic regions. Syst. Bot. 36: 990 – 1003.
  • Hope, G. (2014). The sensitivity of the high mountain ecosystems of New Guinea to climatic change and anthropogenic impact. Arct. Antarct. Alp. Res. 46(4): 777 – 786.
  • International Union for Conservation of Nature (2012). IUCN Red List Categories and Criteria: Version 3.1, Second edition. IUCN, Gland & Cambridge.
  • Mangen, J.-M. (1993). Ecology and Vegetation of Mt Trikora, New Guinea (Irian Jaya/Indonesia). Museum d’Histoire Naturelle de Luxembourg, Luxemburg.
  • Middleton, D. J. & Wilcock, C. C. (1990). Chromosome counts in Gaultheria and related genera. Edinburgh J. Bot. 47: 303 – 313.
  • Raxworthy, C. J., Pearson, R. G., Rabibisoa, N., Rakontodrazafy, A. M., Ramanamanjato, J.-B., Raselimanana, A. P., Wu, S., Nussbaum, R. A. & Stone, D. A. (2008). Extinction vulnerability of tropical montane endemism from warming and upslope displacement: a preliminary appraisal for the highest massif in Madagascar. Global Change Biol. 14: 1703 – 1720.
  • Sleumer, H. (1942). Revision der Ericaceen von Neu-Guinea 2. Bot. Jahrb. Syst. 72: 207 – 269.
  • Sleumer, H. (1957). Florae Malesianae precursores XIV: a revision of the genus Diplycosia (Ericaceae). Reinwardtia 4: 119 – 161.
  • Sleumer, H. (1961). Florae Malesianae precursores XXVII: supplementary notes on Malaysian Ericaceae (Gaultheria, Costera, Diplycosia). Blumea 11: 1 – 8.
  • Sleumer, H. (1963). Florae Malesianae precursores XXXV: supplementary notes towards the knowledge of the Ericaceae in Malaysia. Blumea 12: 89 – 144.
  • Sleumer, H. (1964). Florae Malesianae precursores XXXIX: supplementary notes towards the knowledge of the Ericaceae in Malesia II. Blumea 12: 339 – 347.
  • Sleumer, H. (1967). Ericaceae. Fl. Males. 1 6(5): 669 – 914.
  • Takeuchi, W. (2007). Some notes on Ericaceae from recent expeditions to New Guinea summit environments. Harvard Pap. Bot. 12: 163 – 171.

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Bulletin
Kew Bulletin
http://creativecommons.org/licenses/by-nc-sa/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0