Lagenandra

Madola, Indrakheela, Yakandawala, Deepthi, Yakandawala, Kapila & Karunaratne, Senani, 2021, Two new species of Lagenandra (Araceae) from the Wet Zone of Sri Lanka, Phytotaxa 522 (3), pp. 187-199 : 198

Key for the identification of Lagenandra species in Sri Lanka

Modified from Nicolson (1987) and Madola et al. (2021).

1. Spathe distinctly warty outside...........................................................................................................................................................2

- Spathe smooth or merely roughened outside by papillae...................................................................................................................5

2 Warts large (1.5–3.0 mm long); spathe limb abruptly globular-inflated above the kettle....................................................... L. ovata

- Warts small (to 1.0 mm); spathe limb subcylindric............................................................................................................................3

3. Spathe large (more than 10 cm long); pistillate flowers more than 60........................................................................ L. praetermissa

- Spathe small (up to 10 cm); pistillate flowers less than 40 ................................................................................................................4

4. Spathe outside with few distinct irregular warts; leaves linear lanceolate to linear ovate ............................................. L. wayambae

- Spathe outside, rugose, not with distinct warts; leaves broadly elliptic or broadly lance-ovate...................................... L. lancifolia

5. Leaf-blade sublinear, c. 10 × longer than broad.................................................................................................................................6

- Leaf-blade ovate-lanceolate, to 5 × longer than broad.......................................................................................................................7

6. Leaf-blade to 50 cm long, margins smooth; inside of spathe limb strongly laterally ribbed, outside dark purple ............. L. koenigii

- Leaf-blade to 20 cm long, margins erose; inside of spathe limb rugose spongy, outside green ............................................. L. erosa

7. Spathe limb strongly twisted to one side, inflated and opening subhorizontally ............................................................ L. jacobsenii

- Spathe limb sub-erect, cylindrical and opening subvertically............................................................................................................8

8. Leaf blades often silver margined; Peduncle short.............................................................................................................................9

- Leaf blades not silver margined; Peduncle long...............................................................................................................................10

9. Leaf blade small (upto 20 × 4 cm); narrowly ovate to lanceolate; dark green, abaxial surface smooth; silver margin conspicuous; peduncle c. 2 cm ............................................................................................................................................................... L. thwaitesii

- Leaf blade large (upto 28 × 5.0– 10.5 cm); ovate to narrowly ovate; light green; with a faint silver margin, abaxial surface rugrose; peduncle c. 11 cm ......................................................................................................................................................... L. srilankensis

10. Leaf base round; spathe yellow-green; limb inside surface yellowish white; tail length 9–16 cm; twisted ....................... L. bogneri

- Leaf base tapering, acute; spathe light maroon/violet; limb inside surface maroon; tail length 3.0–6.5; un-twisted .......................... ..................................................................................................................................................................................... L. kalugalensis