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Pakistan | Family List

Araceae

YASIN J. NASIR


National Herbarium, Agricultural Research Council, Islamabad.

Monoecious or paradioecious perennial herbs or shrubs, sometimes epiphytic or aquatic. Roots adventitious. Stem aerial or modified into rhizome, corm or tubers. Leaves alternate, entire or divided. Inflorescence a spadix, subtended by a spathe. Flowers ebracteate, uni- or bisexual, usually protandrous. Perianth usually absent, sometimes of 6 tepals in bisexual flowers (absent in Monstera). Stamens usually 6, free or united, staminodes occasional. Ovary 1-3-locular; ovules few-many; stigma small and sessile. Fruit a berry; seeds few-many.

A large family of 115 genera and c. 2000 species, mostly tropical. Represented in Pakistan by 11 genera and 13 species, of which 6 genera are commonly cultivated. There may be other cultivated genera also.

Araceae indet.

Tuber ovoid-oblong, with stout fibrous roots. Leaves cordate-ovate, 16 cm x 9-10.5 cm, petiole 24-27 cm long, base sheathing.

Kashmir: C-7 above Dhuli, 18.4.52, R.R. Stewart & E. Nasir 23720 (RAW).

There are 2 sheets of this aroid at the National Herbarium, but unfortunately both specimens are vegetative. Last year at the end of May, I went to the area from where it was last collected, but did not succeed in finding it. It may even be a juvenile stage of Arisaema utile Hook. f. as suggested by Dr. Nicolson. Fl.Per.: Probably May.

Acknowledgements: We are grateful to the U.S. Department of Agriculture for financing this research under PL-480. Thanks are also due to Dr. D. Nicolson, Curator of the Botany Department, Smithsonian Institution, Washington, Dr. H. Hara, Botany Dept. Univ. of Tokyo, and Messrs B.L. Burtt, I.C. Hedge and Miss J. Lamond of the Royal Botanic Garden, Edinburgh for giving valuable suggestions and going through the manuscript.


1 Floating herbs   Pistia
+ Terrestrial or marshy herbs or shrubby climbers   (2)
       
2 (1) Spathe leaf-like, not enclosing the laterally placed spadix   Acorus
+ Spathe not leaf-like, various or hooded, partially or almost enclosing the spadix   (3)
       
3 (2) Climbing herbs with bisexual flowers   (4)
+ Low growing herbs with unisexual flowers   (5)
       
4 (3) Stout lianas with large leaves (sometimes perforated). Raphides present. Stamens 4.Spathe large, enclosing the stout concial spadix   Monstera
+ Climbers with smaller, entire or lobed, sometimes variegated leaves. Raphides absent. Stamens 6. Spathe small, curved, enclosing a small, ± cylindrical spadix   Epipremnum
       
5 (3) Suffruticose herbs with an aerial, ± thick and Ringed stem, topped by a crown of leaves. Latex present   Dieffenbachia
+ Herbs with underground stems (tuber, rhizome or corm). Latex absent   (6)
       
6 (5) Leaves undivided, sometimes peltate   (7)
+ Leaves digitately compound or pedate   (10)
       
7 (6) Plants rhizomatous, spathe limb curved, cuspidate   Zantedeschia
+ Plants with underground corms, tubers or with a rootstock. Spathe limb erect   (8)
       
8 (7) Leaves not peltate. Spadix exserted; the male flowers with deflexed hair-like neuters above   Arum
+ Leaves peltate. Spadix included. Neuter organs absent above the flowers   (9)
       
9 (8) Corm up to 15 cm broad. Basal lobes of leaves obtuse   Colocasia
+ Rootstock up to 2 m long. Basal lobes of leaves acute   Alocasia
       
10 (6) Plants monoecious or para-dioecious. Inflorescence appearing with the leaves. Leaves 1-3, trifoliolate, pedate or whorled. Neuter organs subulate   Arisaema
+ Plants monoecious. Inflorescence appearing before the leaves. Leaves solitary, pedate. Neuter organs clavate   Sauromatum

  • List of lower taxa


     

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