Ipomoea

Simões, A. R., Silva, H. & Silveira, P., 2011, The Convolvulaceae of Timor with special reference to East Timor, Blumea 56 (1), pp. 49-72 : 56-57

Key to the species of Ipomoea

1. Sepals distinctly awned at or below the apex, awn straight or curved. Corolla salver-shaped with a long and narrow tube. Stamens and style exserted...................... 2

1. Sepals not distinctly awned at or below the apex, whether or not mucronulate. Corolla mostly funnel-shaped, or campanulate, or sometimes salver-shaped. Stamens and style mostly included, sometimes exserted............... 4

2. Corolla c. 3– 4.5 cm long, scarlet, rarely pure white, tube distinctly widened above the middle. Outer sepals 2 –4.5 mm long (awn excluded), inner ones 3 – 6 mm (awn excluded) .. ... ... ... ... ... ... .. ... ... ... ... ... ... ... .. 3

2. Corolla 7–12 cm long, white with greenish bands, tube not or only slightly widened above the middle. Outer sepals 5 –12 mm long (awn excluded), inner ones 7–15 mm (awn excluded)............................... 2. I. alba

3. Leaves pinnately divided, segments linear-lanceolate, linear or filiform.......................... 19. I. quamoclit

3. Leaves cordate, entire, angled or palmately lobed, not pinnately divided..................... 10. I. hederifolia

4. Corolla 10 cm long or longer, salver-shaped with a long and narrow tube, white, or with greenish or reddish midpetaline bands. Seeds hairy. Large twiners................. 5

4. Corolla usually less than 10 cm long, funnel-shaped or campanulate, rarely salver-shaped, in the latter case not longer than c. 7 cm. Seeds hairy or glabrous. Large to small twiners, or prostrate to erect plants................. 7

5. Stamens inserted near the mouth of the corolla-tube. Sepals subequal or outer ones slightly longer than the inner ones....................... 1. I. aculeata var. mollissima

5. Stamens inserted near the base of the corolla-tube. Outer sepals slightly or much shorter than the inner ones... 6

6. Stamens exserted. Corolla white or with reddish midpetaline bands, 11–14 cm long. Leaves mostly (3 –)5(–7)-lobed, rarely entire. Outer sepals much shorter than inner ones. Stems terete or angular, often longitudinally wrinkled, smooth or rarely muricated........ 22. I. trichosperma

6. Stamens included. Corolla white with greenish bands, 9–12 cm long. Leaves mostly entire. Outer sepals mostly slightly shorter than inner ones. Stems terete, smooth or minutely verrucose......................... 25. I. violacea

7. Sepals entirely glabrous, sometimes muricated...... 8

7. Sepals hairy on the outer surface, or fimbriate at the margins....................................... 18

8. Leaves palmately lobed to palmately compound..... 9

8. Leaves not palmately divided................... 11

9. Leaves palmately divided to the base. Pseudostipules (small leaves of the axillary shoot) often present.......................................... 6. I. cairica

9. Leaves palmately lobed often beyond the middle, but never to the base. Pseudostipules absent.............. 10

10. Stems twining. Sepals not mucronulate. Seeds with long woolly-sericeous easily detaching hairs 11. I. mauritiana

10. Stems prostrate, rooting at the nodes. Inner sepals distinctly mucronulate. Seeds glabrous........... 4. I. batatas

11. Large woody twiner, stems stout. Flowers in axillary panicles............................ 21. I. sumatrana

11. Smaller, mostly herbaceous twiners with thin stems, or prostrate plants. Flowers in few- to several-flowered, peduncled, axillary cymes, or solitary in the leaf-axils.. 12

12. Corolla salver-shaped.............. 20. I. sagittifolia

12. Corolla funnel-shaped......................... 13

13. Corolla up to 2.5 cm long............. 13. I. obscura

13. Corolla 3 cm or longer......................... 14

14. Plants aquatic or growing in marshy places. Stems mostly trailing and rooting, or floating; thick, soft, fistulose or spongy............................. 3. I. aquatica

14. Terrestrial plants. Stems twining or trailing; not thick, soft, fistulose or spongy........................... 15

15. Stems mostly twining......................... 16

15. Stems trailing and mostly rooting at the nodes, rarely twining........................................ 17

16. Corolla yellow, apical parts of the midpetaline bands pubescent. Seeds tomentose. Sepals 5 – 6.5 mm with attenuate, broadly rounded to truncate, slightly emarginate, mucronulate apex....................... 14. I. ochracea

16. Corolla sky blue with a paler or white tube, entirely glabrous. Seeds glabrous, puberulent or pilose along the edges only. Sepals 4.5 – 6 mm long, without a distinct mucro......................................... 23. I. tricolor

17. Leaves subcoriaceous or fleshy; emarginate or sometimes truncate at the apex. Stems 5– 30 m long, containing milky juice........... 15. I. pes­caprae subsp. brasiliensis

17. Leaves herbaceous, broadly ovate-orbicular in outline, attenuate towards the acute or obtuse apex. Stems 1– 5 m, without milky juice.................... 4. I. batatas

18. Flowers axillary. Peduncles very short, or absent. Corolla less than 1.5 cm long......................... 19

18. Flowers not axillary. Peduncles well-developed. Corolla 1.5 cm long, or mostly longer................... 21

19. Erect or ascending herb. Leaf-base acute, attenuate into the petiole. Corolla glabrous........ 17. I. polymorpha

19. Twining or prostrate herbs. Leaf-base cordate. Corolla with midpetaline bands hairy or at least pilose towards the apex...................................... 20

20. Ovary and capsule hairy. Outer sepals linear-acuminate, base ovate. Pedicels none or very short, up to 3 mm. Corolla pink or purple, c. 7–9 mm long..... 9. I. eriocarpa

20. Ovary and capsule glabrous. Outer sepals deltate-lanceolate, base auriculate. Pedicels 8 –15 mm. Corolla white, up to 19 mm long........................ 5. I. biflora

21. Flowers aggregated at the end of the peduncle, involucrate by large bracts................... 16. I. pes­tigridis

21. Flowers whether or not aggregate at the end of the peduncle, not distinctly involucrate.................... 22

22. Sepals up to 4 mm long.............. 13. I. obscura

22. Sepals 5 mm or longer........................ 23

23. Outer sepals orbicular, broadly rounded at the apex. Corolla with puberulent tube and midpetaline bands. Seeds sericeous-pubescent...... 7. I. carnea subsp. fistulosa

23. Outer sepals mostly acute, sometimes subobtuse. Corolla glabrous outside. Seed puberulent or glabrous, sometimes pilose at the hilum or at the edges only............ 24

24. Sepals long-attenuate, or long and linear-acuminate at the apex, herbaceous............................ 25

24. Sepals acute or subobtuse, not long-attenuate towards the apex, herbaceous, membranaceous or coriaceous.. 26

25. Sepals almost linear, acute, 8 –15 mm long. Corolla up to 3 cm long, purple.................... 8. I. decaisnei

25. Sepals lanceolate, 17–25 mm long. Corolla 5– 6 cm long, pale to bright blue with whitish tube (fading to pink in age)................................... 12. I. nil

26. Outer sepals not mucronulate. Corolla 4 – 6 cm. Sepals 11–16 mm, margins not ciliate nor fimbriate........................................... 18. I. purpurea

26. Sepals mucronulate. Corolla 1.5 – 4(– 5) cm. Sepals 5 –6 mm, margins ciliate or fimbriate................. 27

27. Sepals glabrous or sparsely hairy on the back, the margins always distinctly fimbriate. Corolla funnel-shaped c. 1.75–2 cm long, with short obtuse, mucronulate lobes........................................... 24. I. triloba

27. Sepals entirely glabrous, or pilose on the back, the margins ciliate. Corolla campanulate to funnel-shaped, c. 3– 4.5 cm long, not distinctly lobed............... 4. I. batatas