Chassalia chewii T. Y. Yu 2021
- Dataset
- Revision of Chassalia (Rubiaceae-Rubioideae-Palicoureeae) in Borneo, with 14 new species
- Rank
- SPECIES
- Published in
- Yu, Tian Yi, Turner, Ian M., Cheek, Martin (2021): Revision of Chassalia (Rubiaceae-Rubioideae-Palicoureeae) in Borneo, with 14 new species. European Journal of Taxonomy 738: 1-60, DOI: 10.5852/ejt.2021.738.1261, URL: http://dx.doi.org/10.5852/ejt.2021.738.1261
Classification
- kingdom
- Plantae
- phylum
- Tracheophyta
- class
- Magnoliopsida
- order
- Gentianales
- family
- Rubiaceae
- genus
- Chassalia
- species
- Chassalia chewii
description
Description Herb to small treelet, 0.4 – 0.9 m tall, apparently unbranched, glabrous. Lower internodes terete, 2.5 – 4.5 (– 7.5) × 0.3 – 0.5 cm, upper internodes usually drying flattened, strongly canaliculate, slightly broadened at apex, 1.5 – 4 cm long, base 2 – 4 mm wide, apex 3 – 5 mm wide, flowering internodes sometimes highly reduced, 0.5 – 1.5 cm long. Leaf-blades ovate to elliptic, 11 – 16 (– 21) × 3 – 6.5 cm, margin entire, apex acute to acuminate, acumen 1 – 1.5 cm, base cuneate; midrib slightly raised above, domatia absent; secondary nerves 10 – 12 on each side of the midrib, prominent above; tertiary nerves not visible. Petiole flattened, canaliculate, (1.5 –) 2 – 6.5 cm × 0.8 – 1.5 mm. Stipule not sheathing, broadly flabellate, 0.5 – 1.2 × 0.8 – 1.8 cm, margin entire, apex usually broken. Inflorescences compound cymose, 3.5 – 5.5 cm long; peduncle very short to absent; first branches slightly flattened distally, 25 × 1 mm; rachis 4 – 4.5 cm long; second branches of rachis cymose, 15 – 20 × 1 mm; bracts of second branches 8 – 10 × 4 mm, exceeding the flowers and fruits. Flowers sessile in terminal clusters. Hypanthium obovoid, glabrous inside and out, 2 – 3 mm in total; sepals 5, each broadly triangular, 0.5 × 1 mm. Corolla cream white, tube 7 – 8 mm long, broadening from midway to top, lower part 1.5 mm wide, apex 5 mm wide; lobes triangular, 3.5 – 4 × 3 – 4 mm, apex acute or apiculate. Stamens 2.3 – 2.5 mm long, with short spur 0.2 mm long; filaments flat and short, mostly hidden under anthers, 0.2 – 0.3 mm long. Style 7 – 8 mm long, slightly exserted out of corolla tube; stigma flat and large, 1.5 × 3 – 3.5 mm, bilobed, with a slightly raised margin less than 0.5 mm long, centre slightly hollowed. Disc conspicuous, cylindrical with a flat top, 0.5 × 1 mm. Fruit green maturing blue, deep brown when dry, ovoid to ellipsoid, 5 – 6 × 4 – 5 mm, junction between the two pyrenes slightly grooved, calyx persistent, lobes 5, 0.2 × 0.5 mm. Pyrenes plano-convex, dorsal surface convex, with two adjacent parallel longitudinal crests, each 0.2 – 0.3 mm wide, curved, 0.4 – 0.5 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 0.8 – 1.0 mm wide, with a groove between the edge of endocarp and endocarpal outgrowth 0.2 – 0.4 mm wide. Raphal opening at base of the endocarpal outgrowth, round, 0.2 mm long, 0.2 – 0.3 mm from the edge of the pyrene wall, apex with a bony spine, spine triangular, erect, 0.8 – 1 × 0.2 mm. PGS not detected. Seed brown, hemi-ellipsoid, slightly crested at central part of dorsal side, 0.5 × 4 mm, endosperm at central part of the seed, 0.2 – 0.3 mm wide.
description
urn: lsid: ipni. org: names: 77215405 - 1 Figs 10 – 11
diagnosis
Diagnosis Differs from all other Kinabalu species of Chassalia in having elliptic to ovate leaves, in the first internode of flowering branches usually very short (1.5 – 4 cm long), in having 3 peduncles, the main rachis with 3 capitula, and in the bracts of the capitulum being so big that usually they cover the flower buds.
distribution
Distribution, habitat Borneo: Malaysia, Sabah, around Mount Kinabalu. Lower montane forest, alt. 900 – 1500 m.
etymology
Etymology Named after Chew Wee Lek who was the collector of most specimens of this new species.
materials_examined
Type MALAYSIA – Borneo, Sabah • Mt Kinabalu, Ulu Langanani, Sungai Mamut; 6 ° 04 ′ N, 116 ° 40.44 ′ E; alt. 4000 ft; 4 Aug. 1961; fl.; W. L. Chew, E. J. H. Corner & A. Stainton 1226; holotype: K [K 001129712]!. Additional material MALAYSIA – Borneo, Sabah • Mt Kinabalu, Ulu Liwagu and Ulu Mesilau; 6 ° 00 ′ N, about 116 ° 35 ′ E; alt. 5000 ft; 6 Sep. 1961; fl.; W. L. Chew, E. J. H. Corner & A. Stainton 2807; K! • Mt Kinabalu, Ulu Liwagu and Ulu Mesilau; 6 ° 00 ′ N, about 116 ° 35 ′ E; alt. 5000 ft; 22 Aug. 1961; fl.; W. L. Chew, E. J. H. Corner & A. tainton 1948; K! • Mount Kinabalu, Dallas; 3000 ft; 1 Dec. 1931; fr.; J. & M. S. Clemens 27341; K! • Mount Kinabalu, Tenompok; 5000 ft; 12 – 23 Feb. 1932; fr.; J. & M. S. Clemens 30336; K! • Mt Kinabalu, Tenompok; 5000 feet; 19 Feb. 1932; fr.; J & M. S. Clemens 30335; K! • Mt Kinabalu, Ulu Liwagu and Ulu Mesilau; 6 Sept. 1961; fr.; W. L. Chew, E. J. H. Corner & A. Stainton 2804; K!.
Name
- Homonyms
- Chassalia chewii T. Y. Yu 2021