Additions to the flora of the southern mountains of Papua New Guinea: Begonia chambersiae sp. nov. (Begoniaceae), Kibara renneriae sp. nov. (Monimiaceae), and distributional records of four rarely seen taxa Author Takeuchi, Wayne text Phytotaxa 2012 2012-05-11 52 1 43 53 http://biotaxa.org/Phytotaxa/article/view/phytotaxa.52.1.6 journal article 10.11646/phytotaxa.52.1.6 1179-3163 5060862 Kibara renneriae Takeuchi , sp. nov. ( Fig. 4 ) Haec species Kibarae archboldianae affinis sed a qua ramulis teretibus (nec nodos incrassato-clavatis intus formicas hospitantibus), floribus femineis pedicellis nec carinatibus, drupis ovoideis (nec oblongo-ellipsoideis) ca. 18 × 15 mm differt. Type: — PAPUA NEW GUINEA . Gulf Province : Lakekamu , near streambed of the Eloa River , upstream of the expedition base camp (Ivimka), alluvial forest, 7°44'S , 146°29.5'E , 105 m , 2 November 1996 , Takeuchi & Kulang 11533 ( holotype LAE !; isotypes A !, CANB !, K !, L !, UPNG !) . FIGURE 4. Kibara renneriae . A , sterile branchlets, nodes not inflated (compare with Fig. 6 ); B , inflorescence. A–B from Takeuchi & Kulang 11533 . Shrubs or small trees, 4–5 m tall. Branchlets terete (or apically compressed), 2.5–4 mm diameter, straight; surfaces laxly puberulent when immature, glabrescent, lineate (or smooth), yellowish-green to straw, without lenticels; internodes 4–14 cm long. Leaves opposite, equal, exstipulate; petioles 10–17 × 1–3 mm , channelled on upper side, longitudinally rugulose, glabrescent; leaf-blades chartaceous-papery, elliptic-oblong, 15.8–32 × 6.5–12.5 cm , base cuneate (or obtuse), margin entire (or denticulate), obscurely revolute, apex 1–2.2 cm acuminate; surfaces usually dull, glabrous or nearly so, adaxially olivaceous, abaxially tawny; venation brochidodromous, midrib adaxially flat to prominulous, abaxially prominent, secondary veins 6–12 per side, (0.5–) 1.5–5 cm apart, at the lamina center straight-diverging 60–75° from the midrib, supramedially arcuate, closing by abruptly looping nerves (2–)4–8(–10) mm from margins, anastomosing beyond the loops, with or without a second inframarginal set of commissural nerves parallel to the first, partial intersecondary veins usually present between the main laterals; reticulum conspicuous, irregular, finely areolate, nervules distinctly raised on both sides. Inflorescence axillary, monochasial or a racemiform dichasium, 2–4 × 2–3 cm , 1–4 together, strigulose; bracts inserted at the peduncle base and the nodes above, scalelike, ovate-deltate, 0.5–1 × 0.3–0.8 mm , persisting at anthesis, spreading, densely adpressed-hairy. Male flowers not seen. Female flower s (1–)3–6 per inflorescence; pedicel (6–)10–18 × 0.3–0.8 mm , widest at the top, filiform, not articulate; receptacle ellipsoid-obovoid, 3–3.5 × 2.3–2.5 mm at anthesis, 4.5–5 × 3.5–4.5 mm when abscissing, splitting near the middle, internal surfaces densely hirtellous; bracteoles 0–2, rotund, 0.1–0.2 × 0.3–0.7 mm , inserted within 1 mm of the ostiole; tepals 4 in 2 decussate pairs, obtuse, imbricate, medially swollen-glanduliferous, outermost tepals the largest, 0.3–0.5 × 0.5–1 mm ; carpels 15–22, conoid-columnar, 1–1.3 × 0.2–0.4 mm , sessile, hirtellous; styles absent; stigmas rounded or acute, connivent, their apices occluding the orifice below the tepals. Infructescence of single receptacles from foliate axils; pedicels vasiform, 9–11 × 1–3 mm , round in cross-section (not carinate), dull orange-brown; receptacle discoid or globular, 5.5–7.5 mm across, accrescent; fruiting monocarps ovoid, ca. 18 × 15 mm , crustaceous, black, seated on ca. 1.5 × 2.5 mm cylindriform knobs. Etymology: — Kibara renneriae is named after systematist Susanne S. Renner (Ludwig Maximilian University of Munich), a specialist in Melastomataceae and Monimiaceae . Field characters: —Outer bark brown, wood light brown; branchlets shining green, often covered with a sooty mold, not ant-inhabited; leaves papyraceous, ± bullate, adaxially very dark green, abaxially yellowgreen (glaucescent when young); flowers dull yellow; fruiting monocarps purple-black. Distribution: —Known from two lowland localities in the Gulf Province of PNG ( Fig. 3 : B–C). Habitat and ecology: —Perhumid alluvial forest, 105–250 m elevation. Phenology: —Flowering in November; fruiting in August. Additional specimen examined: — PAPUA NEW GUINEA . Gulf District : Kikori Subdistrict , Purari River , Wabo Dam site, small gully, 7°00'S , 145°10'E , 250 m , 18 August 1975 , Conn , Pattison , Sands & Wood LAE 66299 ( L , LAE !) . The staminate inflorescence of Kibara renneriae is unknown, but the generic assignment is clear from the vegetative and pistillate characters enumerated in Philipson (1984: 482) . The most significant of these applies to the pedicels, which in Kibara Endlicher (1837: 314) are distally expanded and not articulated at the receptacle. In the genus most likely to be confused with Kibara [viz., Steganthera Perkins (1898: 564) ] the pedicels are jointed at the top and not dilated. Although Kibara is also similar to Wilkiea Mueller (1858: 64) , the new species (having a sessile stigma) cannot be assigned to that genus because Wilkiea has a distinctly elongate style ( Philipson 1985: 390 , 1986: 282–283 ). Even if future adjustments are imposed within the Mollinedioideae , Kibara is still the oldest name within the Kairoa-Kibara-Wilkiea clade. Under any likely scenario, the proposed binomial should be immune from nomenclatural disturbance. Kibara renneriae was formerly assigned to K. archboldiana Smith (1941: 240) but this interpretation is no longer plausible (see discussion of K. archboldiana , next section). The two species are easily separated by the characters specified in the preceding diagnosis.