Argyreia

P. R., Lawand & Shimpale, V. B., 2024, Revision of the genus Argyreia (Convolvulaceae) from India, Rheedea 34 (5), pp. 337-396 : 340-342

Key to the species of Argyreia in India

1. Leaves broadly ovate, base deeply cordate ..... 2

1. Leaves ovate, elliptic, oblong, base cuneate, rounded, truncate or shallowly cordate….. 21

2. Leaves silvery shiny or white tomentose abaxially ........................................................... 3

2. Leaves hirsute, strigose or sparsely hairy abaxially ......................................................... 13

3. Stamens exserted ........................................... 4

3. Stamens included ........................................... 5

4. Bracts persistent, ovate-orbicular; sepals unequal, outer two obovate, inner 3 oblong, rounded at apex .............................. A. osyrensis

4. Bracts caducous; sepals equal, ovate, obtuse at apex .................................................……. A. bella

5. Inflorescence a capitate cyme ........................ 6

5. Inflorescence a lax cyme................................. 8

6. Leaves ash-white abaxially; corolla 3–4 cm long; berries red ............................... A. wallichii

6. Leaves silvery shiny or white hairy abaxially; corolla 4–6 cm long; berries yellow .............. 7 7. Climbers; petiole shorter than peduncle ... A. sericea

7. Prostrate or trailing shrubs; petiole longer than peduncle...................... A. sharadchandrajii

8. Leaves glabrous adaxially .............................. 9

8. Leaves strigose adaxially ............................. 10

9. Bracts variously twisted, white; berries brown, dry ..................................................... A. nervosa

9. Bracts not twisted, green; berries yellow, fleshy ............................................... A. bracteata

10. Leaves and sepals silvery shiny abaxially; inflorescence 3–7-flowered cymes .... A. argentea

10. Leaves and sepals white tomentose abaxially; inflorescence 10–16-flowered cymes.......... 11

11. Bracts lance-ovate; sepals ovate, apex obtuse or rounded .................................. A. nellygherya

11. Bracts spathulate, wider at middle; sepals not ovate, apex narrowly acute or acuminate …… 12

12. Sepals lanceolate, 2–2.3 cm long; leaf apex acute, base round or shallowly cordate ..... A. arakuensis

12. Sepals ovate, c. 1 cm long; leaf apex acuminate, base deeply cordate .......................... A. hookeri

13. Leaves hirsute, strigose abaxially ............... 14

13. Leaves sparsely hairy or hairy on veins abaxially ........................................................ 19

14. Plants densely hispid; inflorescence capitate cymes .......................................... A. capitiformis

14. Plants hirsute or strigose; inflorescence lax cymes ............................................................. 15

15. Sepals and bracts variously twisted; corolla tube c. 5-7 mm wide .......................... A. cymosa

15. Sepals and bracts not as above; corolla tube c. 10 mm wide or more ................................... 16

16. Plants hirsute; corolla 5–6 cm long, throat purple; berries yellow ................................. 17

16. Plants strigose; corolla 3–5 cm long, throat white; berries red or purple ......................... 18

17. Bracts lanceolate, 1–1.5 cm long, hirsute without; leaf apex acuminate, secondary veins 9–11 pairs, indumentum short ........ A. hirsuta

17. Bracts linear, 2–2.5 cm long, hairy at base; leaf apex acute, secondary veins 13–14 pairs, indumentum long and dense ....... A. coonoorensis

18. Bracts orbicular; sepals orbicular; corolla limb pale pink .............................................. A. setosa

18. Bracts linear; sepals lance-ovate; corolla limb purple .............................................. A. mastersii

19. Inflorescence 11–15-flowered; bracts oblong; sepals apex acuminate ...................... A. boseana

19. Inflorescence 5–10-flowered; bracts lance-ovate; sepals apex acute ................................ 20

20. Bracts 1–1.5 cm long, caducous; outer two sepals recurved at apex ............... A. roxburghii

20. Bracts 2–2.5 cm long, persistent; outer sepal not recurved at apex ..................... A. kleiniana

21. Leaves silvery shiny or white tomentose abaxially ........................................................ 22

21. Leaves hirsute, strigose or sparsely hairy abaxially ........................................................ 27

22. Leaves silvery shiny abaxially; berries brown or red ............................................................. 23

22. Leaves white tomentose abaxially; berries yellow............................................................. 25

23. Secondary veins of young leaves purple, 18–22 pairs; berries dry, brown ................. A. fulgens

23. Secondary veins green, 12–15 pairs; berries fleshy, red ................................................... 24

24. Bracts subulate, 3–5 mm, early caducous ......................................................... A. splendens

24. Bracts ovate, obtuse, c. 1 cm, persistent in flowering ............................................. A. mollis

25. Inflorescence 6–9-flowered; bracts spathulate; leaf apex acuminate ................... A. srinivasanii

25. Inflorescence 1–3 flowered; bracts oblong or linear; leaf apex acute, round or emarginate ... 26

26. Peduncles longer than petiole; bracts linear ... ............................................. A. kondaparthiensis

26. Peduncles shorter than petiole; bracts oblong ......................................................... A. zeylanica

27. Inflorescence capitate cymes; peduncles 1–5 cm long ......................................................... 28

27. Inflorescence lax cymes; peduncles longer than 6 cm ...................................................... 29

28. Bracts spathulate, oblong; sepals ovate, densely brown hirsute ................................ A. thomsonii

28. Bracts lance-ovate; sepals oblong, lanceolate, sparsely hairy .......................... A. atropurpurea

29. Bracts 1–3 mm long, very early caducous .. 30

29. Bracts more than 1 cm long, persistent in flowering ...................................................... 31

30. Plant a shrub; berries dry, brown ... A. cuneata

30. Plant a climber; berries fleshy, orange or yellow ................................................ A. elliptica

31. Peduncles shorter than the petiole or equaling; bracts oblong or linear .................................. 32

31. Peduncles longer than the petiole; bracts lance-ovate or spathulate ............................ 33

32. Plants spreading or trailing; leaves strigose abaxially; bracts linear ........................ A. pilosa

32. Plants twiners; leaves sparsely hairy abaxially; bracts oblong .............................. A. involucrata

33. Bracts spathulate, wider at middle; sepals lanceolate........................................... A. daltonii

33. Bracts lance-ovate; sepals ovate ................. 34

34. Leaf sparsely hairy abaxially, base cuneate; peduncles 10–20 cm long .......... A. sikkimensis

34. Leaf strigose abaxially, base cordate; peduncles 6–12 cm long ........................................ A. lawii