Ipomoea

A. P. S, Lima, M. T. A., Buril & Melo, J. I. M. de, 2024, Synopsis of Ipomoea (Convolvulaceae) in the state of Paraíba, Brazilian Northeastern, Rheedea 34 (5), pp. 430-456 : 434-436

Key to the species of Ipomoea in the state of Paraíba, Brazil

1. Peduncles arise through the sinus at the base of the leaf ........................... 3. I. aristolochiifolia

1. Peduncles arise opposite the leaf .................. 2

2. Peduncles twisted in a spiral ......................... 3

2. Peduncles straight .......................................... 4

3. Outer sepals muricate or smooth. 17. I. heptaphylla

3. Outer sepals fimbriate ................... 36. I. tenera

4. Branches, petioles and pedicels setose .. 34. I. setosa

4. Branches, petioles and pedicels glabrescent, sericeous, hirsute, tomentose, or glabrous .. 5

5. Branches aculeate ........................................... 6

5. Branches smooth or muricate ...................... 7

6. Subapical rostrum present on the external sepals; corolla> 5 cm long, hypocrateriform, white limb, exserted stamens ............ 2. I. alba

6. Subapical rostrum absent in all sepals; corolla <5 cm long, funnelform, blue or lilac limb, included stamens ...................... 28. I. parasitica

7. Sepals with a subapical rostrum ................... 8

7. Sepals without a subapical rostrum ........... 10

8. Corolla hypocrateriform,red,stamens exserted .................................................. 16. I. hederifolia 8. Corolla funnelform or campanulate, lilac or pink, stamens included .................................. 9

9. Leaves simple; corolla <5.5 cm long ....................................................... 5. I. bahiensis

9. Leaves compound with 3 leaflets; corolla> 5.5 cm long ............................................ 31. I. rosea

10. Leaf blade pinnatifid, 8–15 pairs of linear segments ................................... 30. I. quamoclit

10. Leaf blade entire or palmatilobed (sometimes absent, caducous during flowering in I. vespertilia ) ...................................................... 11

11. Shrubs, subshrubs or herbs, stems erect or prostrate ........................................................ 12

11. Climbing plants, stems twining ................. 16

12. Branches erect; corolla pubescent ............................... 12. I. carnea subsp. fistulosa

12. Branches prostrate; corolla glabrous ......... 13

13. Sepals with trichomes in the margin; ovary hirsute ............................................. 6. I. batatas

13. Sepals entirely glabrous; ovary glabrous .... 14

14. Leaf blade elliptical to oblong; corolla cream with yellowish tube ................. 18. I. imperati

14. Leaf blade reniform to suborbicular; corolla pink ............................................................... 15

15. Leaf blade with a rounded or acute apex and a cordate base; sepals unequal, the outers half the size of the inner ones .......... 4. I. asarifolia

15. Leaf blade with emarginate apex and truncated or rounded base, sepals subequal, the outer slightly smaller than the inner ones ................................................... 29. I. pes-caprae

16. Branches and peduncles tomentose ........... 17

16. Branches and peduncles glabrous, glabrescent, pubescent, sericeous or hirsute .................. 22

17. Corolla cream or greenish .......................... 18

17. Corolla pink or purplish ............................. 19

18. Corolla with the base linear, limbus 4-5 cm diameter, stamens exserted ...... 23. I. marcellia

18. Corolla with the base geniculate, limbus 2–3 cm diameter, stamens reaching the top of the corolla tube, but not exceeding it ............ 38. I. vespertilia

19. Leaf blade cordate to suborbicular, abaxial surface densely sericeous silver; capsules indehiscent ............................ 33. I. sericosepala

19. Leaf blade ovate, abaxial surface densely tomentose; capsules dehiscent .................... 20

20. Bracteoles oblong to obovate, persistent ................................................... 11. I. calyptrata

20. Bracteoles elliptic or lanceolate, caducous ..... 21

21. Pedicels and sepals glabrescent ............................. 9. I. brasiliana var. brasiliana

21. Pedicel and sepals pubescent to tomentose ........................... 10. I. brasiliana var. subincana

22. Sepals sericeous, tomentose or hirsute ...... 23

22. Sepals glabrous, glabrescent, or pubescent with few trichomes restricted to the margins or base ........................................................... 27

23. Sepals with prominent basolateral glands ............................................ 25. I. megapotamica

23. Sepals without basolateral glands ............... 24

24. Sepals with rounded apex; bracteoles oblong .......................................... 22. I. longibracteolata

24. Sepals with acute, acuminate, or caudate apex; bracteoles linear or filiform ........................ 25

25. Leaf blade glabrescent or slightly pubescent ........................................................ 26. I. meyeri

25. Leaf blade sericeous ..................................... 26

26. Sepals with attenuated apex, sericeous with trichomes hyaline; corolla> 7 cm long .......................................................... 20. I. indica

26. Sepals with caudate apex, hirsute with trichomes opaque orange or yellowish; corolla <7 cm long .......................................... 27. I. nil

27. Leaf blade palmatilobed .............................. 28 27. Leaf blade entire ........................................... 31

28. Sepals flat; corolla <3 cm long, entirely cream or yellow with vinaceous mouth ................ 29

28. Sepals convex; corolla> 3 cm long, pink or purple-red ..................................................... 30

29. Leaf blade 3-lobed, sericeous, lobes acuminate; corolla cream ..................... 14. I. eremnobrocha

29. Leaf blade 5–7-lobed, glabrescent, lobes rounded; corolla yellow with vinaceous mouth ................................. 21. I. longeramosa

30. Leaf blade 3-lobed; corolla fully purple or white limb with purple tube in natural material ...................................................... 8. I. blanchetii

30. Leaf blade 5–7-lobed; corolla pink in natural material .................................. 24. I. mauritiana

31. Sepals subequal ............................................. 32

31. Sepals unequal .............................................. 34

32. Leaf blade sagittate; sepals lanceolate, chartaceous, veins conspicuous ......................... 19. I. incarnata

32. Leaf blade oval, cordate or reniform; sepals oblong, membranous or coriaceous, veins inconspicuous ............................................... 33

33. Sepals <1 cm long, convex; corolla funnelform, pink or purplish ......................... 7. I. batatoides

33. Sepals> 1.5 cm long, flat; corolla hypocrateriform, white with greenish tube ........................................................38. I. violacea

34. Outer sepals longer than the inner ones .................................................. 15. I. grandifolia

34. Outer sepals shorter than the inner ones ...... 35

35. Sepals with conspicuous scarious margin ...... 36

35. Sepals with discrete or absent scarious margin. 38

36. Outer sepals shorter, half the size of the inner ones ........................................... 35. I. squamosa

36. Outer sepals slightly shorter than the inner ones ............................................................... 37

37. Sepals membranaceus, inner oblong to obovate, the apex obtuse, rough; corolla 2.5– 3.5 cm long .......................... 1. I. acanthocarpa

37. Sepals coriaceous, inner orbicular to suborbicular, the apex emarginate to retuse, smooth or striated; corolla 4–7 cm long ..................................................... 12. I. decipiens

38. Inner sepals obovate, two shorter outer elliptical ................................. 31. I. ramosissima

38. Inner sepals oblong, one outer oblongelliptical shorter than the others 37. I. tiliacea