Chassalia Comm. ex Poir.,

Turner, Ian M. & Cheek, Martin, 2021, Revision of Chassalia (Rubiaceae-Rubioideae-Palicoureeae) in Borneo, with 14 new species, European Journal of Taxonomy 738, pp. 1-60: 7-8

publication ID

https://doi.org/10.5852/ejt.2021.738.1261

DOI

http://doi.org/10.5281/zenodo.4599244

persistent identifier

http://treatment.plazi.org/id/355087D8-FFFF-E464-1AE0-FD42EA5CC21A

treatment provided by

Plazi

scientific name

Chassalia Comm. ex Poir.
status

 

Key to species of Chassalia Comm. ex Poir.  in Borneo

1. Plant epiphytic, fruit narrowly ellipsoid, 3–4 mm wide, pyrene dorsal surface with a central groove, pyrene ventral surface with a central groove and ridge as high as plane of endocarpal outgrowth ............................................................................ Chassalia javanica (Blume) I.M.Turner 

– Plant terrestrial (sometimes epiphytic in C. muluensis  ), fruit ellipsoid or globose,> 5 mm wide, pyrene dorsal surface with 1 or 2 central longitudinal crests, pyrene ventral surface with a central ridge lower than the plane of the endocarpal outgrowth .................................................................. 2

2. Stipules bilobed to the base, apex of lobes caudate; inflorescences with 2–3 toothed stipule-like bracts usually <5 mm long, corolla tubes curved, usually winged; pyrene dorsal surface with 1 central longitudinal crest ...................................... Chassalia curviflora (Wall.) Thwaites  complex

– Stipule margins entire, incised or 1–3 toothed, usually not bilobed, if bilobed then by <¼ the length; inflorescences with bracts> 5 mm long at secondary peduncle node and each capitulum; corolla tubes not curved or winged; pyrene dorsal surface with 2 central, adjacent longitudinal crests ...... 3

3. Herb or small shrub, 25–30 cm tall; fruit white when ripe ...... Chassalia muscicola T.Y.Yu  sp. nov.

– Herb, shrub or tree, taller than 40 cm; fruit bluish green, blue, purplish green or dark purple when ripe .................................................................................................................................................... 4

4. Abaxial surface of leaves with midrib and secondary nerves densely pubescent .............................. ............................................................................... Chassalia psychotriformis I.M.Turner  nom. nov.

– Abaxial surface of leaves with midrib and secondary nerves glabrous ............................................ 5

5. Inflorescences longer than longest leaves (Mount Kinabalu) ..... Chassalia longipes T.Y.Yu  sp. nov.

– Inflorescences shorter than longest leaves ........................................................................................ 6

6. Stem, petiole, nerves of leaves abaxially and peduncle blackish purple, corolla usually purplish white ................................................................................... Chassalia atropurpurea T.Y.Yu  sp. nov.

– Stem and petiole green or purplish green, nerves of leaves abaxially and peduncle green, corolla white, cream white or yellowish white ............................................................................................. 7

7. Bracts of capitulum not covering top of calyx at anthesis (Kinabalu) ............................................... ............................................................................................ Chassalia kinabaluensis T.Y.Yu  sp. nov.

– Bracts of capitulum covering top of calyx at anthesis ...................................................................... 8

8. Leaf-blades lanceolate to narrowly elliptic, 5–10 times as long as wide ......................................... 9

– Leaf-blades elliptic, oblong, obovate or ovate, 2–4 times as long as wide .....................................11

9. Bracts of capitulum 10–12 × 5–10 mm, usually equal to or longer than flower buds; fruits 10–12 mm long (Kuching) ...................................................................... Chassalia macrocarpa T.Y.Yu  sp. nov.

– Bracts of capitulum 3–6 × 2–6 mm, usually shorter than flower buds; fruits <8 mm long ........... 10

10. Leaf-blades elliptic or oblanceolate, 5–7 times as long as wide (Kuching) ....................................... ................................................................................................... Chassalia lancifolia T.Y.Yu  sp. nov.

– Leaf-blades narrowly lanceolate, 8–10 times as long as wide (Kuching) .......................................... ............................................................................................. Chassalia lancifolioides T.Y.Yu  sp. nov.

11. Longest leaf-blades usually longer than 25 cm, inflorescences <6 cm long, peduncle <4 cm long .. ......................................................................................................................................................... 12

– Longest leaf-blades usually shorter than 20 cm, inflorescences Ẑ 6 cm long, peduncle> 4 cm long. ......................................................................................................................................................... 14

12. Bracts of capitulum covering fruits (Sarwak, Sabah and Brunei) ...................................................... ................................................................................................ Chassalia involucrata T.Y.Yu  sp. nov.

– Bracts of capitulum not covering fruits .......................................................................................... 13

13. Stems 5–12 mm diameter, internodes 3–6 cm long (Sabah: Tambunan and Ranau) .......................... ..................................................................................................... Chassalia calamus T.Y.Yu  sp. nov.

– Stems 4–6(–8) mm diameter, internodes 1–3 cm long (Sabah: Kinabalu) ......................................... .................................................................................................... Chassalia beamanii T.Y.Yu  sp. nov.

14. Rachis and branches of inflorescence <4 mm long or absent, capitulum condensed into 1 head .. 15

– Rachis and branches of inflorescence> 10 mm long, capitulum not condensed into 1 head ......... 16

15. Plant only producing 1 flowering branch on old stems, bracts of capitulum Ξ 5 mm long ................ ............................................................................................................ Chassalia blumeana Govaerts 

– Plant usually producing 2 flowering branches on old stems, bracts of capitulum Ẑ 10 mm long ....... ....................................................................................................... Chassalia ramosa T.Y.Yu  sp. nov.

16. Peduncle Ξ 1 cm long, bracts of capitulum longer than flowers and fruits ......................................... ........................................................................................................ Chassalia chewii T.Y.Yu  sp. nov.

– Peduncle> 1 cm long, bracts of capitulum shorter than flowers and fruits .................................... 17

17. Inflorescences usually longer than first pair of leaves; secondary nerves 16–18 on each side of the midrib (Gunung Mulu endemic) .............................................. Chassalia muluensis T.Y.Yu  sp. nov.

– Inflorescences usually shorter than first pair of leaves; secondary nerves 8–14 on each side of the midrib (Sabah and Sarawak) ..................................................... Chassalia northiana T.Y.Yu  sp. nov.

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