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Published In: Species Plantarum 2: 1034. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
General/Distribution: A genus with c. 100 species, distributed mainly in north temperate regions of the world; represented in Pakistan by 6 taxa.

 

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Deciduous trees. Buds with several unequal scales. Leaves alternate; petiole usually long, terete or flattened, lamina entire or lobed, linear to rhombic ovate, dentate, serrate; often dimorphic on long and short shoots. Flowers appearing before leaves, anemophilous, in elongate, cylindrical, pendent, pedunculate catkin. Each flower in the axil of a laciniate or toothed bract; pedicellate; disc cup-shaped. Stamens 4-many, filaments free. Ovary sessile, unilocular, surrounded at the base or up to three quarters of its length by the disc; ovules many on 2-4 parietal placentas, style short, stigmas 2-4. Capsule 2-4 valved; seeds minute, numerous, with a long dense tuft of silky hairs.
 

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1 Lamina lobed (or sometimes narrowly oblong and entire on young plants and suckers) buds pubescent, not sticky. (2)
+ Lamina not lobed, buds sticky. (3)
2 (1) Lamina always lobed white tomentose beneath. 2 Populus alba
+ Lamina morphologically very variale, glabrous. 4 Populus euphratica
3 (1) Stigmas 2, sessile. Capsule 2-valved. (4)
+ Stigmas 3-4; capsule 3-4 valved. (5)
4 (3) Lamina 5-12 cm long, nearly as broad, female catkin up to 10.5 cm long. 6 Populus nigra
+ Lamina 2-7 cm long, 3-7.5 cm broad, female catkin up to 7 cm long. 1 Populus afghanica
5 (3) Lamina 7-18 cm long, 6-13 cm broad, base usually cordate, catkin in fruit, 15-30.5 cm long, capsule pedicellate (pedicel 2.5-10 mm). 3 Populus ciliata
+ Lamina 4-10.5(-18) cm long, 3-9 cm broad, female catkin in fruit 6-10 cm long, capsule subsessile (pedicel 1-1.5 mm). 5 Populus pamirica
 
 
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