Phyllagathis, Blume, 1831

Lin, Che-Wei, Chen, Chien-Fan & Yang, T. Y. Aleck, 2017, Ten new species of Phyllagathis (Trib. Sonerileae, Melastomataceae) from Sarawak, Borneo, Phytotaxa 302 (3), pp. 201-228 : 201-202

Key for the species of Phyllagathis in Borneo and Natuna Island

1. Flowers pentamerous.........................................................................................................................................................................2

- Flowers tetramerous..........................................................................................................................................................................9

2. Inflorescences a pleiochasium, not congested....................................................................................................................................3

- Inflorescences umbelliform or a very congested pleiochasium.........................................................................................................4

3. Ovary without crowns .............................................................................. Phyllagathis subacaulis (Cogniaux) Cellinese (2003: 93)

- Ovary with crowns ............................................................... Phyllagathis rajah C.W.Lin, Chien F.Chen & T.Y.A.Yang (2015: 123)

4. Intersepalous appendages present ..................................................................................................................................................... 5

- Intersepalous appendages absent........................................................................................................................................................6

5. Leaves rarely maculate; hypanthium covered with glandular trichomes ....... Phyllagathis jacobsiana (Nayar) Cellinese (2003: 85)

- Leaves always maculate; hypanthium puberulous, the hairs not glandular .......... Phyllagathis guttata (Stapf) Cellinese (2003: 83)

6. Leaves veins basal or lateral nerves rising from very near the base..................................................................................................7

- Leaves veins suprabasal....................................................................................................................................................................8

7. Leaves elliptic-ovate; stamen dorsal appendages absent.................................. Phyllagathis osmantha (Nayar) Cellinese (2003: 88)

- Leaves lanceolate; stamen dorsal appendages present ..................................................... Phyllagathis steenisii Cellinese (2003: 93)

8. Small herbs to 35 cm tall; stamen dorsal appendages absent..................................... Phyllagathis rufa (Stapf) Cellinese (2003: 91)

- Large herbs taller than 35 cm; stamen dorsal appendages present........................ Phyllagathis penrissenensis Cellinese (2003: 89)

9. Inflorescences thyrsoid.....................................................................................................................................................................10

- Inflorescence a pleiochasium, umbelliform, or flowers solitary......................................................................................................14

10. Single-stemmed shrubs; thyrses with 1 axis; sepals conspicuously thickened ............ Phyllagathis pulcherrima Nayar (1968: 301)

- Herbs; thyrses with 1 or 3 axes; sepals thin.....................................................................................................................................11

11. Leaf apex obtuse to more often truncate; inflorescences longer than the leaves ................................................................................. .............................................................................................................. Phyllagathis longispicata (Cogniaux) Maxwell (1982: 221)

- Leaf apex acute to acuminate; inflorescences never longer than the leaves....................................................................................12

12. Large herbs up to 120 cm high; leaf base rounded, auriculate; inflorescence axis quadrangular, winged; stamen dorsal appendages absent............................................................................................................................. Phyllagathis gigantifolia Nayar (1976: 231)

- Small herbs up to 40 cm high; leaf base cordate; inflorescence axis terete, not winged; stamen dorsal appendages present.........13

13. Leaves elliptic-lanceolate; base rounded to narrowly cordate; stamen ventral appendages auriculate................................................ ................................................................................................................... Phyllagathis longifolia (Cogniaux) Maxwell (1982: 221)

- Leaves ovate to elliptic-obovate; base widely cordate; stamen ventral appendages cylindric or club-shaped.................................... ............................................................................................................ Phyllagathis atroviolacea C. Hansen ex Cellinese (2003: 72)

14. Inflorescences a pleiochasium, not congested..................................................................................................................................15

- Inflorescences umbelliform or very congested pleiochasium, sometimes flowers solitary.............................................................16

15. Leaves peltate ........................................................................................................... Phyllagathis peltata Stapf ex Ridley (1946: 38)

- Leaves not peltate ....................................................................................................... Phyllagathis gymnantha Korthals (1844: 252)

16. Leaves peltate; inflorescence glabrous........................................................ Phyllagathis beccariana (Cogniaux) Nayar (1976: 231)

- Leaves not peltate; inflorescence puberulous...................................................................................................................................17

17. Leaf blades ovate, elliptic to lanceolate...........................................................................................................................................25

- Leaf blades panduriform-obovate, widely obovate to oblanceolate.................................................................................................18

18. Inflorescences umbelliform..............................................................................................................................................................19

- Inflorescences a pleiochasium..........................................................................................................................................................24

19. Stem shorter than 7 cm, leaves in a rosette......................................................................................................................................23

- Stem longer than 10 cm, leaves not rosetted....................................................................................................................................20

20. Stem unbranched..............................................................................................................................................................................21

- Stem multibranched.......................................................................................................................................5. Phyllagathis rivularis

21. Leaves longer than 18 cm, oblanceolate to narrowly panduriform-obovate ......................................................... 7. Phyllagathis ulu

- Leaves shorter than 18 cm, widely obovate to panduriform-obovate..............................................................................................22

22. Stem and petiole covered with erect trichomes, inflorescence subsessile............................................... 6. Phyllagathis rubrosetosa

- Stem and petiole covered with appressed trichomes, inflorescence with a peduncle 4–7 cm long ......... 3. Phyllagathis millelunata

23. Leaves green, capsule non-ribbed ...................................................................................................................10. Phyllagathis yodae

- Leaves dark olive green to blackish, capsule 8-ribbed............................................................................................ 2. Phyllagathis lii

24. Leaves longer than 10 cm, adaxial surface glossy, each inflorescence with many flowers ......................4. Phyllagathis phyllioides

- Leaves shorter than 10 cm, adaxial surface rough, each inflorescence with 1 to 4 flowers......................8. Phyllagathis violinifolia

25. Leaves strongly unequal ................................................................................... Phyllagathis dispar (Cogniaux) Hansen (1982: 559)

- Leaves equal or subequal..................................................................................................................................................................26

26. Leaves ovate to nearly orbicular........................................................................................... Phyllagathis brookei Nayar (1976: 232)

- Leaves widely elliptic to lanceolate.................................................................................................................................................27

27. Leaves widely elliptic; bracts leaf-like, up to 4.4 cm long............................................ Phyllagathis elliptica Stapf (1894 : pl. 2279)

- Leaves narrowly elliptic to lanceolate; bracts ovate, oblanceolate or linear, not leaf-like, up to 0.7 cm long.................................28

28. Leaves adaxial surface flat, anthers yellow...................................... Phyllagathis rupicola (Nayar) Hansen ex Cellinese (2003: 92)

- Leaves adaxial surface rugose, anthers purplish to bluish...............................................................................................................29

29. Leaves dark maroon with broad emerald green margins, petals abaxial surface hairy ...................................1. Phyllagathis bicolor

- Leaves uniformly green, petals glabrous.......................................................................................................9. Phyllagathis wallacei