Field Key to Sterile and Juvenile Specimens of Amydrium

Based on Boyce, 1999

Click on 📌 to highlight and compare characteristics.
Click on the line numbers to select characteristics.



1A. Plants without adherent climbing stems .. 2
2A. Leaves entire, with or without perforations .. 3
3A. Leaf base cordateCordate: .. 4
4A. Leaf laminaLamina: Leaf blade. thinly coriaceousCoriaceous: Resembling or having the texture of leather. .. 5
5A. Petiolar sheath extending almost to apicalApical: Of, relating to, or denoting an apex. geniculum. Leaf laminaLamina: Leaf blade. lanceolateLanceolate: , often with perforations. Stems smooth (P. R. China (incl. Hainan), N Vietnam) .. 📌1. Amydrium hainanense
5B. Petiolar sheath short, often not exceeding basalBasal: Forming or belonging to a bottom layer or base. geniculum, never extending more than half way along petiolePetiole: Leaf stem. . Leaf laminaLamina: Leaf blade. various. Stems various .. 6
6A. Leaf laminaLamina: Leaf blade. mostly ovateOvate: , never with perforations. Stems rough (P. R. China, N Vietnam) .. 📌4. Amydrium sinense
6B. Leaf laminaLamina: Leaf blade. broadly ovateOvate: to oblongOblong: -lanceolateLanceolate: , occasionally with a few perforations. Stems smooth (Myanmar, Thailand, Cambodia, Vietnam?, Peninsular Malaysia, Singapore, Sumatra, Java, Borneo, Philippines, Maluku) .. 📌3. Amydrium medium
4B. Leaf laminaLamina: Leaf blade. thickly coriaceousCoriaceous: Resembling or having the texture of leather. (Peninsular Malaysia; Sumatra) .. 📌2. Amydrium humile
3B. Leaf base rounded to cuneateCuneate: (P.R. China, N Vietnam) .. 📌4. Amydrium sinense
2B. Leaves variously divided, with or without perforations .. 7
7A. Leaf pinnatipartitePinnatipartite: Having lobes with incisions that extend more than half-way toward the midrib. to pinnatisectPinnatisect: Having lobes with incisions that extend almost, or up to midrib. , never perforateForate: With aperatures or openings. d (Philippines, Sulawesi,Maluku, New Guinea) .. 📌5. Amydrium zippelianum
7B. Leaf pinnatifidPinnatifid: to pinnatipartitePinnatipartite: Having lobes with incisions that extend more than half-way toward the midrib. , almost always perforateForate: With aperatures or openings. d (Myanmar, Thailand, Cambodia, Vietnam?, Peninsular Malaysia, Singapore, Sumatra, Java, Borneo, Philippines, Maluku) .. 📌3. Amydrium medium
1B. Plants with adherent climbing stems .. 8
8A. ApicesApices: Plural of apex. End forming a point. of adherent stems with copious net-like fibres; leaf laminaLamina: Leaf blade. various, often exceeding 75 cm in length; (Philippines, Sulawesi, Maluku, New Guinea) .. .. 📌5. Amydrium zippelianum
8B. ApicesApices: Plural of apex. End forming a point. of adherent stems without net-like fibres, although cataphyllCataphyll: A reduced, small leaf. Usually used to describe a modified leaf which lacks a blade and in appearance corresponds to a petiole sheath. s sometimes degrading into weak, free fibres or if net-like fibres present then laminaLamina: Leaf blade. segments drooping; leaf laminaLamina: Leaf blade. , usually not exceeding 50 cm, if longer then with net-like fibres and usually drooping segments .. 9
9A. Leaf laminaLamina: Leaf blade. entire, much perforateForate: With aperatures or openings. d (P. R. China (incl. Hainan), N Vietnam) ? .. 📌1. Amydrium hainanense
9B. Leaf laminaLamina: Leaf blade. not as above .. 10
10A. Leaf laminaLamina: Leaf blade. entire, never perforateForate: With aperatures or openings. d (P. R. China, N Vietnam) .. 📌4. Amydrium sinense
10B. Leaf laminaLamina: Leaf blade. pinnatifidPinnatifid: , pinnatipartitePinnatipartite: Having lobes with incisions that extend more than half-way toward the midrib. or pinnatisectPinnatisect: Having lobes with incisions that extend almost, or up to midrib. , perforateForate: With aperatures or openings. d or not .. 11
11A. Leaf laminaLamina: Leaf blade. pinnatisectPinnatisect: Having lobes with incisions that extend almost, or up to midrib. or pinnatipartitePinnatipartite: Having lobes with incisions that extend more than half-way toward the midrib. , never perforateForate: With aperatures or openings. d, segments usually drooping, laminaLamina: Leaf blade. often exceeding 75 cm in length; plants with copious netlike fibres at the apicesApices: Plural of apex. End forming a point. of adherent shoots; (Philippines, Sulawesi, Maluku, New Guinea) .. 📌5. Amydrium zippelianum
11B. Leaf laminaLamina: Leaf blade. pinnatifidPinnatifid: or pinnatipartitePinnatipartite: Having lobes with incisions that extend more than half-way toward the midrib. , almost always perforateForate: With aperatures or openings. d, segments spreading, laminaLamina: Leaf blade. seldom exceeding 50 cm in length; plants lacking net-like fibres at the apicesApices: Plural of apex. End forming a point. of adherent shoots; (Myanmar, Thailand, Cambodia, Vietnam?, Peninsular Malaysia, Singapore, Sumatra, Java, Borneo, Philippines, Maluku) .. 📌3. Amydrium medium
 


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