Key to individual or group of species based on sterile material
Notes
1. These keys can be used to identify a few selected Cinnamomum species or group of species. In the latter case, in order to determine the final species identity, it is essential to compare the specimen at hand to the species descriptions or to reliably identified herbarium materials.
2. A key based on flowering material was not made, firstly because the number of anther locules, although useful for species indentification when coupled with vegetative characters, is variable (see Table 1) and would result in a long key; and secondly, because floral characters such as stigma type, position of glands on filament and shape of staminode are not user friendly due to their minute size. Therefore, when a flowering specimen is available, I would advise the user to use the vegetative key to narrow down the species and then to use floral characters (by refering to Table 1 and the species descriptions) to finalise the species identity.
3. A hand lens is sometimes necessary when examining hair types particularly for the straight and appressed hairs which are usually minute and thin.
1. Leaves penninerved; terminal buds perulate…..17. C. porrectum
1. Leaves trinerved or triplinerved; terminal buds not perulate ……2
2. Leaves large, 25–48 by 7.5–21 cm…….3
2. Leaves small, (3–)5–25(–35) by (1–)3–7(–12) cm……4
3. Leaves minutely appressed hairy below; major intercostal veins faint and less prominent than midrib…...10. C. kerangas
3. Leaves glabrous below; major intercostal veins distinctly raised, as prominent as the midrib…...7. C. grandifolium
4. Lateral veins extending to 1/2–3/4 the lenght of leaf blade……5
4. Lateral veins extending to the leaf tip or at least the base of acumen……6
5. Mature leaves blade with dense curly hairs below (if becoming glabrescent the remnant of indumentum always present near the midrib)……11. C. kinabaluense
5. Mature leaves glabrous……2. C. burmanni, 3. C. calciphilum, 20. C. sintoc, 26. C. verum
6. Mature leaves hairy below……7
6. Mature leaves glabrous below……10
7. Mature leaves with straight and appressed hairs below, usually sparse……8
7. Mature leaves with curly hairs below, usually dense (if becoming glabrescent the remnant of indumentum always present near the midrib)……9
8. Midrib distinctly angular below; leaf apex caudate, acumen slender, 0.5–1.5(–2.5) cm long……19. C. rhynchophyllum
8. Midrib smoothly raised below; leaf apex when intact, acute or acuminate……8. C. iners, 22. C. subavenium, 23. C. subcuneatum
9. Major intercostal veins scalariform and as prominent as the midrib; minor intercostal veins scalariform……9. C. javanicum
Major intercostal veins subscalariform, not as distinct as midrib; minor intercostal veins reticulate……1. C. angustitepalum, 22. C. subavenium, 23. C. subcuneatum, 24. C. sublanuginosum, 25. C. tahijanum
10. Leaf apex caudate, abruptly constricted, forming a slender and appendage-like acumen ……6. C. cuspidatum
10. Leaf apex acute or acuminate…..4. C. corneri, 5. C. crassinervium, 12. C. lawang, 13. C. paiei, 14. C. pendulum, 15. C. percoriaceum, 16. C. politum, 18. C. racemosum, 21. C. soegengii