Revision of Chassalia (Rubiaceae-Rubioideae-Palicoureeae) in Borneo, with 14 new species
Yu, Tian Yi
Turner, Ian M.
Cheek, Martin
European Journal of Taxonomy
2021
2021-03-09
738
1
60
I. M. Turner
I. M. Turner. Among
2021
[506,958,1180,1208]
Magnoliopsida
Rubiaceae
Chassalia
Plantae
Gentianales
51
52
Tracheophyta
species
psychotriformis
nom. nov.
Replaced synonym: Cephaelis psychotrioidesValeton, Icones Bogorienses4 (3): t. 357 ( Valeton 1913b). – Chassalia psychotrioides(Valeton) I.M.Turner, Feddes Repertorium139: 399 ( Turner 2019), nom. illegit., non Chassalia psychotrioidesDC., Prodromus Systematis Naturalis Regni Vegetabilis4: 531 (1830) ( Candolle 1830). – Type: INDONESIA• Borneo, Liang Gagang; 1893–1894; Hallier2703; hololectotype:BO[BO-1374040], designated by Turner(2019: 399); isolectotype: BO[BO-1374039]. Additional material MALAYSIA– Borneo, Sarawak• Serian, Gunong Penrissen; 2 May 1962; Ilias Paie S 16336; K!, L, SAR• Serian, Tebedu, Bukit Simurus; 12 Feb. 1985; Abg. Mohtar S 49281; K!, SAR• 2 nd Division, Lubok Antu District, Lanjak-Entimau P. F., Sg. Jelok, near Bukit engkajang; 18 Mar. 1974; Paul Chai S 34024; K!, L, KEP, MO, SAN, SAR• INDONESIA• Borneo, Jaro Dsm, 10 km NEof Muara Uya, Kalimantan Selatan; alt. 90 m; 16 Nov. 1971; Kuswata Kartawinata 828; K!, L.
Description Shrub to small tree, 1–1.5 mtall. Stem terete, central part slightly canaliculate when dry, hairy from the first or second internode from apex. Internodes 1.5–8 cm× 4 mm. Leaf-blades obovate to elliptic, 20.5–28.5 × 5.5–8 cm, apex acute to acuminate, base truncate, adaxial surface glabrous, abaxial surface hairy, midrib slightly raised on both sides, densely hairy abaxially, petiole 2–5.5 cmlong, young petiole hairy, glabrescent. Stipule flabellate, apex usually broken, 3–8 × 5–10 mm, slightly hairy when young. Inflorescence a compound cyme, 7 cmlong, all parts hairy except fruits; peduncle 4 cmlong, bracts of peduncle stipule-like, 1 × 5 mm, first branches and first internode of rachis 2–2.5 cmlong, bracts of first branches and first internode of rachis 2, 4–6 × 1–2 mm, second branches and second internode of rachis 3.1 cmlong, bracts of second branches and second internode of rachis 2, slightly smaller than bract of first branches and first internode of rachis, 2 × 2 mm, bracts of capitulum 2–3 × 2 mm. Flowers not seen. Fruits 8–10 × 4–9 × 4–6 mm, blackish brown when dry, calyx persistent, not accrescent, 0.4 × 2 mm, disc persistent, not accrescent, 0.5 × 1 mm. Pyrenes plano-convex, 8–9 × 4–9 × 4–6 mm, dorsal surface convex, with two adjacent parallel longitudinal crests, 0.5 mmwide, 0.25 mmapart 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 1–1.2 mmwide, with a groove between the edge of endocarp and endocarpal outgrowth 0.5 mmwide. Raphal opening, bony spine, PGS, seed and endosperm not detected.
Distribution Borneo: West Kalimantan, Bukit Liang; Sarawak, First Division, Serian, Gunung Penrissen.
Remarks Turner (2019)transferred Cephaelis psychotrioidesValetonto Chassalia. The resultant new combination was illegitimate, being a later homonym of Chassalia psychotrioidesDC., a species from Mauritius. Therefore a nomen novum is here published for Valeton’s name for the Bornean species. Valeton’s typespecimen Hallier 2703(BO-1374040) has a hairy infructescence. Additional information provided by the drawing included in the original publication of this species also shows that it has hairy petioles and abaxial leaf midribs ( Valeton 1913b). The species differs from other Asian species of Chassaliaby having a hairy petiole, lower midrib and secondary nerves of the leaves, also the stem apices and inflorescences are densely pubescent. Chassalia psychotriformisis restricted to a region straddling the Sarawak-Kalimantan border in Borneo based on specimen records from K and other herbaria. The most distinctive vegetative character of C. psychotriformisis the pubescent abaxial surface of the leaves and the pubescent peduncles. It is the only species that has been found with a hairy peduncle among all Asian species of Chassalia. Therefore, the identification of C. psychotriformisis not difficult compared to that of most other Bornean species of Chassalia.
3050815311
Indonesia
Liang Gagang
Borneo
51
52
1
type
3050815322
S 16336
1962-05-02
K, L, SAR
Malaysia
Serian
Ilias Paie
Gunong Penrissen
51
52
1
Sarawak
3050815333
S 49281
[276,1219,1572,1599]
1985-02-12
K, SAR
Malaysia
Serian
Bukit Simurus
Tebedu
51
52
1
Borneo
3050815367
S 34024
1974-03-18
P, F, K, L, KEP, MO, SAN, SAR
Sg. Jelok
Malaysia
Division
Lanjak-Entimau
Lubok Antu District
51
52
1
Borneo
3050815354
1971-11-16
NE, K, L
Indonesia
Borneo
90
Muara Uya
Jaro Dsm
51
52
1
Kalimantan Selatan