Revision of Chassalia (Rubiaceae-Rubioideae-Palicoureeae) in Borneo, with 14 new species Author Turner, Ian M. i.turner@kew.org Author Cheek, Martin Herbarium, Royal Botanic Gardens, Kew, Richmond, Surrey TW 9 3 AE, UK. Queen Mary University of London, E 1 4 NS, UK. Singapore Botanical Liaison Officer, Herbarium, Royal Botanic Gardens, Kew, Richmond, Surrey TW 9 3 AE, UK. Singapore Botanic Gardens, National Parks Board, 1 Cluny Road, Singapore 259569, Singapore. m.cheek@kew.org text European Journal of Taxonomy 2021 2021-03-09 738 1 60 http://dx.doi.org/10.5852/ejt.2021.738.1261 journal article 7783 10.5852/ejt.2021.738.1261 02cf5931-b18e-4d58-a6ff-9c7b1e37e68d 2118-9773 4594541 Chassalia kinabaluensis T.Y.Yu sp. nov. urn:lsid:ipni.org:names:77215407-1 Figs 14–15 Diagnosis Similar to Chassalia atropurpurea sp. nov. , differs in having green-brown, not dark purple stems, pedicels, midribs and inflorescence axes; in having a shorter peduncle, 3.5 cm long when flowering (not 3.5–6 cm long); differs also in having relatively long pedicels, 2–4 mm long (not subsessile or sessile). Etymology The epithet alludes to Mount Kinabalu to which the new species is endemic. Type MALAYSIA – Borneo , Sabah • Mount Kinabalu , head of Liawagu River Trail ; alt. 1800–1900 m ; 6°02′ N , 116°33′ E ; 23 Mar. 1995 ; John H . Beaman 11299 ; holotype : K [ K001129712 ]!; isotypes: UNIMAS , IBEC . Additional material MALAYSIA – Borneo, Sabah • Tenompok , Mount Kinabalu ; alt. 1500 m ; Jun. 1932 ; J . & M . S . Clemens 28169 ; K ! • Mesilau River ; alt. 1500 m ; 27 Jan.1964 ; RSNB 4157 ; K ! • Ranau , Tenompok F . R ., Lower Montane Forest ; 30 Aug. 2001 ; JTP 825 ; K ! • along the East Mesilau River between Mt Kinabalu golf course site and Mesilau Cave ; 6°03′ N , 116°36′ W ; alt. 1700–1900 m ; 20 Dec. 1983 ; John H . Beaman 7977 ; K !, MSC , UKMS • Mt Kinabalu National Park , montane oak forest; alt. 1630 m ; 27 May 1966 ; Ding Hou 227 ; K !, L . Fig. 14. Chassalia kinabaluensis T.Y.Yu sp. nov. A . Flowering shoot. B . Flower. C . Part of infructescence. D . Dry fruit. E . Pyrene ventral surface. From John H. Beaman 11299 . Drawn by T.Y. Yu. Fig. 15. Holotype of Chassalia kinabaluensis T.Y.Yu sp. nov. ( John H. Beaman 11299 ). Description Shrub to treelet, 0.5–0.9 m tall, glabrous, stems green-brown (also pedicels, midribs and inflorescence axes). Internodes from flowering branch (1–)2–5(–9.5) cm × 2–4 mm , lower internodes terete, upper internodes usually flattened, canaliculate, broadening at apex, base 2–4 mm wide, apex 3–5 mm wide. Leaf-blades narrowly elliptic to narrowly oblanceolate, 13–21.5 × 3.5–5 cm , margin entire, apex acute, base cuneate; midrib slightly raised above, domatia absent; secondary nerves 8–12 on each side of the midrib, prominent above; tertiary nerves not visible. Petiole terete, sometimes canaliculate, usually slightly winged, 10–25 × 1–2 mm . Stipule not sheathing, broadly flabellate, 5–11 × 8–10 mm , apex usually broken. Inflorescence a compound cyme, 6–12 cm long; peduncle 3.5–6 cm long; bracts of first internode of rachis and first branches 2, triangular, flabellate or lanceolate, 3–12 × 1–3 mm , sometimes with 2–3 teeth on the margin; first internode of rachis and first branches 4.5–8.5 cm long; second internode of rachis and second branches 2.5–4.5 cm long; bracts of capitulum oblong-obovate, 3–5 × 2 mm , apex rounded. Pedicel short, 2–4 × 0.5 mm . Flowers subsessile, usually 5 in each capitulum, 10–12 mm long, hypanthium 1–3 × 0.6–0.8 mm , calyx tube 0.3–1 × 1–2.5 mm , lobes 0.3 × 0.4–0.5 mm . Corolla cream white or purplish white, tube base narrow, 0.6–1.2 mm wide, broadening from midway, apex 3.5–4.5 mm wide, corolla lobes triangular, 2.5 × 2 mm . Fruits iridescent blue, ellipsoid, 7–8 × 4–5.5 mm , with pedicels 2–4 mm long. Pyrenes plano-convex, dorsal surface convex, with two adjacent parallel longitudinal crests, each 0.3 mm wide, curved, 0.3 mm apart along their length, forming a longitudinal groove from apex to base between the two crests; ventral surface concave, central part slightly elevated, margin with an endocarpal outgrowth 0.6 mm wide, with a groove between the edge of endocarp and endocarpal outgrowth 0.2–0.3 mm wide. Raphal opening at base of the endocarpal outgrowth, narrowly ovoid, 0.5 × 0.2 mm , 0.2–0.3 mm from the edge of the pyrene wall, apex with a bony spine, spine triangular, erect, 0.5–0.7 × 0.2–0.3 mm . PGS not detected. Seed light brown, hemiellipsoid, slightly crested at central part of dorsal side, 0.3 × 4 mm , endosperm not detected. Distribution, habitat Borneo: Sabah , Mount Kinabalu (Kinabalu National Park), Lower montane forest, alt. 1100–1500 m .