Nepenthes (Jebb & Cheek, 1997)

Cheek, Martin & Jebb, Matthew, 2013, Recircumscription of the Nepenthes alata group (Caryophyllales: Nepenthaceae), in the Philippines, with four new species, European Journal of Taxonomy 69, pp. 1-23 : 4-6

Key to the species of the Nepenthes alata group updated from Cheek & Jebb (2013b)

1. Lower surface of lid, including appendage (if present), densely and evenly covered in uniformly minute circular nectar glands (0.15–0.2 mm diam.) ..............................…….................……….. 2

– Lower surface of lid with nectar glands either absent from the appendage (if present) and/or, sparse, large or dimorphic (larger glands 0.35–0.4 mm diam. or larger) ...................................……….….. 3

2. Stems glabrous to glabrescent; upper pitchers lacking fringed wings in upper part; outer surface lacking stellate hairs entirely. S LUZON TO MINDANAO ........ N. graciliflora Elmer ( Elmer 1912)

– Stems persistently pubescent; upper pitchers with fringed wings in upper part; outer pitcher surface> 50% covered in grey stellate hairs. N LUZON ................................ N. alata Blanco ( Blanco 1837)

3. Stem internodes winged from the decurrent petiole bases. MINDANAO, SARANGANI PROV. ..... ....................................................................................... N. saranganiensis Sh.Kurata ( Kurata 2003)

– Stem terete or angular, lacking wings .............................................................................................. 4

4 Upper pitchers funnel-shaped or funneliform-cylindric ................................................................... 5

– Upper pitchers not funnel-shaped, but subcylindric, widest at base, or equally at base and apex .... 6

5. Stems and abaxial surface of midrib moderately densely covered in white appressed hairs 0.5– 1.5 mm long; lid of upper pitchers ovate, longer than broad. Volcanic substrate. MINDANAO, MTS APO & MATUTUM ....................................................… N. copelandii Macfarl.( Macfarlane 1908)

– Stems and leaf-blades glabrous; lid of upper pitcher broader than long. Ultramafic substrate. MINDANAO, MT KIAMO ............................... N. ceciliae Gronem. et al. ( Gronemeyer et al. 2012)

6 Petiole appearing flat, at least distally (wings held flat) ................................................................... 7

– Petiole appearing cylindrical (wings incurved) ............................................................................... 12

7. Stems and lower surface of midrib conspicuously densely pubescent; lid appendage well-developed, hooked .............................................................................................................................................. 8

– Stems and inner surface of midrib glabrous or inconspicuously and sparsely pubescent; lid appendage moderately or well-developed, never hooked .................................................................................. 9

8. Upper pitchers widest at base, contracting slightly above into a narrower cylinder with fringed wings. NEGROS & BILIRAN ISL. …………...…… N. negros Jebb & Cheek ( Cheek & Jebb 2013d)

– Upper pitchers equally wide at base and apex, contracting slightly at the middle, lacking fringed wings. MINDANAO, SURIGAO PROV. ..............… N. ramos Jebb & Cheek ( Cheek & Jebb 2013c)

9. Lid apex with pocket. MINDANAO, S COTABATO ...................... N. tboli Jebb & Cheek sp. ined. – Lid apex lacking pocket or any appendage .................................................................................... 10

10. Petiole canaliculate proximally (flat distally); blade hairy on upper surface; upper pitchers stout, length: breadth ratio 2–2.5:1; fringed wings absent. MINDANAO, MT HAMIGUITAN .................. ............................................................ N. hamiguitanensis Gronem. et al. ( Gronemeyer et al. 2010)

– Petiole flat proximally; blade glabrous on upper surface; upper pitchers slender, length: breadth ratio> 3:1; fringed wings present below peristome ……................…………………………………… 11

11. Upper pitcher with lid about half as long as mouth; mouth not concave but flat; column absent; lid base truncate. MINDANAO, MT MALINDANG …….........…… N. kurata Jebb & Cheek sp. nov.

– Upper pitcher with lid about as long as mouth; mouth highly concave; column present; lid base cordate. MINDANAO, KITANGLAD MTS …….......……. N. kitanglad Jebb & Cheek sp. nov.

12. Largest pitchers robust, 18–24 cm long; peristome 7–8 mm wide, curved in section but not cylindric; inner edge of peristome with small teeth visible, outer edge lobed. MINDANAO ………..……....13

– Largest pitchers 12 cm long; peristome 2–3 mm wide, narrowly cylindrical, inner edge lacking visible teeth (unless dissected), outer edge not lobed. LEYTE ISL. ..... N. leyte Jebb & Cheek sp. nov.

13. Largest pitchers without fringed wings; leaf midrib densely, minutely white stellate-hairy; lid base deeply cordate. MINDANAO, RED MT ….........................…… N. extincta Jebb & Cheek sp. nov.

– Largest pitchers with fringed wings; leaf midrib with brown black bristle-like hairs 1–1.5 mm long; lid base truncate. NE MINDANAO ……..............…… N. mindanaoensis Sh.Kurata ( Kurata 2001)