Monotes

Catarino, L., Martins, E. S., Abreu, J. A. & Figueira, R., 2013, Revision of the family Dipterocarpaceae in Angola, Blumea 57 (3), pp. 263-274 : 265

2. Monotes

1. Upper leaf surface of adult leaves glabrous or with hairs only on the midrib and lateral nerves................... 2

1. Upper leaf surface of adult leaves with indumentum of simple and/or stellate hairs............................ 10

2. Lower surface of adult leaves glabrous.............. 3

2. Lower surface of adult leaves pubescent............ 4

3. Lateral nerves in 9 –11 pairs............. 14. M. glaber

3. Lateral nerves in 13–18 pairs..... 24. M. xasenguensis

4. Interreticular areoles of lower leaf surface glabrous.... 5

4. Interreticular areoles of lower leaf surface pubescent or hidden by the indumentum of the veins.............. 6

5. Lower leaf surface with curled hairs on the nerves........................................ 5. M. africanus

5. Lower leaf surface with sparse simple hairs and numerous glandular hairs on the nerves......... 23. M. rubriglans

6. Blade of adult leaves up to 8 cm long............... 7

6. Blade of adult leaves 8– 20(– 25) cm long............ 8

7. Lower leaf surface with disperse straight hairs on the nerves, interreticular areoles with a short dense whitish indumentum of curled hairs.................... 18. M. loandensis

7. Lower surface tomentose with simple, short hairs on veins and interreticular areoles.............. 20. M. noldeae

8. Lower leaf surface whitish, with sparse straight hairs and yellow glands on the nerves and dense, short curled hairs covering the veins and areoles.........11. M. discolor

8. Lower leaf surface yellowish, brownish or greyish, minute stellate hairs covering the interreticular areoles...... 9

9. Adult leaves 10–18 cm long, lower surface yellowish to brownish, with curled hairs on the nerves and veins.................................... 7. M. caloneurus

9. Adult leaves 8–11 cm long, lower surface greyish to brownish, with short cottony hairs on the nerves and veins.................................... 12. M. elegans

10. Adult leaves more than 10 cm long............... 11

10. Adult leaves up to 10 cm long................... 17

11. Upper surface of leaves with simple, straight hairs only. ........................................... 12

11. Upper surface of leaves with both simple and stellate hairs....................................... 16

12. Apex of leaves rounded, truncate or emarginated, areoles glabrous or with stellate hairs................... 13

12. Apex of leaves typically acuminate (or in the same plant leaves acuminate and acute, obtuse, rounded or emarginate), areoles with stellate hairs and yellow to amber glands..................................... 15

13. Areoles on lower leaf surface covered with stellate hairs................. 4. M. adenophyllus subsp. homblei

13. Areoles on lower leaf surface glabrous or subglabrous 14

14. Lower leaf surface subglabrous, with only sparse simple and penicillate hairs on the nerves and veins, venation not prominent........ 3. M. adenophyllus subsp. delevoyi

14. Lower leaf surface pubescent, with the midrib and lateral nerves covered with penicillate and simple flexuous hairs, venation prominent.......... 16. M. hutchinsonianus

15. Leaf blades 7–13 by 4 –7(–10) cm, lower surface tomentose, with dense flexuous hairs on the nerves and veins masking the areoles; lateral nerves in 10–15 pairs.................................... 9. M. dasyanthus

15. Leaf blades 8 –15 by 5–12 cm, lower surface with curled hairs on the nerves and veins not masking the areoles; lateral nerves in 14–18 pairs........ 19. M. mutetetwa

16. Lower leaf surface with a dense indumentum of short curled hairs on the nerves and veins, less dense in the areoles................................... 10. M. dawei

16. Lower leaf surface with a continuous woolly-tomentose indumentum of long flexuous hairs, hiding the interreticular areoles............................ 21. M. paivae

17. Largest adult leaves 7–10 cm long............... 18

17. Largest adult leaves up to 6 cm long............. 21

18. Leaves discolorous, lower surface yellowish, light brown or cream-whitish............................. 19

18. Leaves concolorous, lower surface brown......... 20

19. Upper leaf surface with short penicillate hairs, more abundant on the midrib and lateral nerves, petiole 1.1–2.2 cm long, canaliculate.................. 6. M. angolensis

19. Upper leaf surface with short simple and stellate hairs and resiniferous glands, petiole 1.6 – 2.1 cm long, terete.................................... 22. M. pearsonii

20. Upper leaf surface covered with stellate hairs, petiole 1.5– 2 cm long, terete...................17. M. hypoleucus

20. Upper leaf surface with simple and glandular hairs; petiole 2 – 3 cm long, canaliculate......... 8. M. carrissoanus

21. Nerves and veins in lower leaf surface covered with a dense indumentum of curled hairs, masking the areoles..................................... 15. M. gossweileri

21. Nerves and veins in lower leaf surface covered with short curled hairs, not masking the areoles.... 13. M. engleri