Decalobanthus

KEY TO THE SPECIES OF DECALOBANTHUS View in CoL

1. Cauline leaves all peltately attached (small leaves below inflorescences and bracts in inflorescences sometimes basally attached)..................................... 2

1. Cauline leaves and all smaller leaves and bracts basally attached...................................... 3

2. Inflorescences many-flowered, corymbose, ± secund; sepals 0.9–1.3(–1.5) cm long; corollas 3–3.5 cm long, white with blackish tube base, minutely granular-glandulose outside.................................... 11. D. elmeri View in CoL

2. Inflorescences several-flowered, loosely paniculate or flowers solitary; sepals 1.8–2.5 cm long; corollas 4–6 cm long, white or yellow, not glandular outside.....16. D. peltatus View in CoL

3. Stems and branches lenticellate................... 4

3. Stems and branches smooth, striate, or angled, not lenticellate.......................................... 8

4. Leaves with 6 or 7 secondary veins on either side of the midvein...................................... 5

4. Leaves with 8–11 secondary veins on either side of the midvein...................................... 6

5. Corolla broadly funnelform, c. 6 cm long; fruit indehiscent, black.............................. 17. D. pulcher

5. Corolla salverform, 2.5–3 cm long; fruit 4-valved, brownish................................18. D. sumatranus View in CoL

6. Inflorescence bracts ovate, c. 3 by 2 cm, sessile, persistent; sepals up to 3 cm long; corolla dotted with tiny golden glands outside........................... 4. D. bracteatus View in CoL

6. Inflorescence bracts all caducous, or lowermost bract foliose, petiolulate; sepals 1.1–2.2 cm long; corolla lacking glandular dots outside................................... 7

7. Sepals 1.8–2.2 cm long; corolla 5.5–6 cm long......................................... 3. D. borneensis View in CoL

7. Sepals 1.1–1.2 cm long; corolla 2–2.5 cm long....................................... 7. D. crassinervius

8. Corolla midpetaline bands sericeous to tomentose..... 9

8. Corollas glabrous or minutely glandular-dotted, lacking hairs on midpetaline bands........................... 12

9. Stems, branches and leaves softly tomentose-villous; corollas c. 6 cm long; capsules 1.8–2 cm long. — Vietnam................................... 10. D. eberhardtii View in CoL

9. Stems, branches and leaves glabrous or tomentose-pubescent; corollas 1.2–3 cm long; capsules 0.9–1.2 cm long........................................... 10

10. Corollas white, limb erect, crenulate; hairs on midpetaline bands drying white on darker background. — N Sumatra.............................. 14. D. ooststroomii View in CoL

10. Corollas yellow, limb spreading or reflexed, entire; hairs on midpetaline bands almost same colour as background. — China, Laos, Vietnam......................... 11

11. Corollas c. 3 cm long; buds conical, tapering-pointed; sepals 1–1.2 cm long, tapering acute; secondary veins 8–10 on either side of the midvein............ 1. D. bimbim View in CoL

11. Corollas 1.2–1.7(–2.1) cm long; buds ovoid, blunt; sepals 0.4–0.7 cm long, obtuse or rounded; secondary veins 6–8 on either side of the midvein.......... 2. D. boisianus View in CoL

12. Flowers with an ‘epicalyx’ at the junction of pedicel with calyx: a lobed ring, a deep groove, or 4 flat lobes; inflorescences umbelliform or appearing so.............. 13

12. Flowers without any appendages or groove at pedicel/ calyx junction; inflorescences cymose, cymose-paniculate, corymbose, or flowers solitary................... 15

13. ‘Epicalyx’ of 4 flat lobes; sepals 1.7–2 cm long; corollas 3.5–4 cm long; secondary veins 10 or 11 on either side of midvein. — Fiji.................... 5. D. calyculatus

13. ‘Epicalyx’ a groove or thick lobed ring; sepals 1–1.8 cm long; corollas 3–5 cm long; secondary veins 7–10 on either side of midvein............................... 14

14. Corollas rotate, pinkish or white, lacking glands outside; stamens and pistil protruding; ‘epicalyx’ a thick lobed ring. — Philippines, Taiwan......... 9. D. distillatorius View in CoL

14. Corollas broadly funnelform-campanulate, white with yellow tube, outside minutely golden gland-dotted; stamens and pistil included; ‘epicalyx’ a groove at pedicel/calyx junction. — Southwestern Pacific islands....... 15. D. pacificus View in CoL

15. Corollas 1.5–2.5 cm long; sepals 0.6–1 cm long.... 16

15. Corollas 4.8–12 cm long; sepals 2–3.6 cm long.... 17

16. Sepals 0.6–0.7 cm long; corollas 1.5–2 cm long; secondary veins 5–7 on either side of the midvein......................................... 6. D. clemensianus

16. Sepals 0.9–1 cm long; corollas 2–2.5 cm long; secondary veins 7–10 on either side of the midvein.......................................... 12. D. korthalsianus View in CoL

17. Corollas 4.8–6 cm long, bright yellow, without glandular indument; secondary veins 5–7 on either side of the midvein; leaf bases rounded or emarginate........................................ 8. D. discoidespermus View in CoL

17. Corollas 7–12 cm long, pale yellow or white with yellow tube, minutely gland-dotted outside; secondary veins 7–9 on either side of the midvein; leaf bases cordate.................................... 13. D. mammosus View in CoL