Thanks Sukla ji for these details. Dr. Gurcharan Singh Retired Associate Professor SGTB Khalsa College, University of Delhi, Delhi-110007 Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018. Phone: 011-25518297 Mob: 9810359089 http://www.gurcharanfamily.com/ http://people.du.ac.in/~singhg45/
On Thu, Feb 13, 2014 at 9:51 AM, Sukla Chanda <[email protected]> wrote: > *POPULUS* L. > > The genus *Populus* L., popularly known as Poplar distributed throughout > the world chiefly in the northern temperate regions and a few are extending > to East Africa ( Mabberley, 2008). The genus *Populus* has the characters > as follows: > > Deciduous trees; branches lon. Leaves alternate; leaf blades ovate, > deltoid, rhombic, elliptic, rarely lanceolate or linear, often dimorphic > or even polymorphic; petioles long, terete, or laterally compressed. > Catkins appear before the leaves ( precocious), long pedunculate, > pendulous, often lax-flowered; flowers pedicellate; borne on a disc; male > flowers: stamens 4-many; female flowers: ovary sessile, surrounded by the > disc, 1-loculed. Capsules 2-4-valved; seeds numerous. > > The genus *Populus* L. consists of 35 species ( Mabberlay, 2002 and > 2008), but according to Fang *et al*.( 1999) and Ali( 2001) *Populus* L. > have 100 species which are distributed in Asia, Europe, North America and > Northern Africa. > > Most of the species of *Populus* L. are distributed in the > North-Western Himalayan region in India. *P. ciliata* has extended > distribution from Jammu & Kashmir to Arunachal Pradesh of India. This genus > shows a longer path of distribution from Afghanistan to China touching > Pakistan, India, Nepal, Bhutan and Myanmar.* P. alba*, *P. nigra* var. > *italica*, and *P. deltoides* etc. are stated to be basically introduced > for a long time. Several exotic species and their hybrids are in trials > mainly in the North-western Himalaya. Large scale cultivation are mainly > occur in tarai and Hilly regions of Uttar Pradesh and Punjab. As the wood > of Poplars are directly related to wood industry, different business houses > and companies take initiative for spreading and increasing > *Populus*cultivation. Species of > *Populus* L. in cultivation are known as Poplar, Aspen, Cottonwood are > also known to cultivated in gardens. However, much plant is planted for > pulp wood, windbreaks, avenues and also as ornamental. > > * SALIX > L.* > > Deciduous trees, or shrubs; branches terete. Leaves mostly alternate; > blades variously shaped, often long and narrow; petioles frequently short; > stipules small, free, deciduous. Catkin solitary, axillary to terminal, > appearing before, with or after leaves; male flowers: sessile, bracteate; > glandular; gland 1 or 2, fleshy and juicy; stamens 2-many; filaments free, > or connate; female flowers: sessile, bracteate; glandular; ovary sessile or > stipitate. Infructescence slender; capsules ovoid-conical, 2-valved; seeds > oblong to ellipsoid, small, comose. > > The genus *Salix* L. have 400 species, chiefly distributed in northern > temperate regions ( Mabberley, 2008 ), a few are also found in the Southern > Hemisphere excluding Australia and New Guinea. According to Fang ( 1987) > there are *ca*. 526 species of *Salix *L. in the World, most of which are > distributed in the Northern Hemisphere, with only a few are distributed to > Southern Hemisphere. In India most of the species are found in the Himalaya > from Jammu & Kashmir to Arunachal Pradesh. A few viz. *S. tetrasperma*and *S. > ichnostachya* are available in the tropical and subtropical zones as > well. *S. tetrasperma* is the most widely spread species of Salix in > India, found almost all the parts. > > Collection and identification of *Salix* are pretty laborious job as it > found in very hostile hill slopes and look very similar in the field. As no > such elaborate flower is present in this member, identification can be > confirmed after dissecting the flower in many cases. > > The majority of the species of *Salix *are grown along or near the river > banks, lakes, etc. even grow on boulder-strewn ground near stream. The > common habitat of *Salix *nearer to water bodies reflects the fact that > they need constant moisture supply for immediate seed germination. Many > willows are grown as ornamental and for screens, shelter, holding banks and > some of the species for the tough flexible branches from which baskets are > made. > > > Thanks, > Sukla > ------------------------------------------------ > Sukla Chanda, PhD > Science & Education, > The Field Museum, Chicago IL. > > -- > You received this message because you are subscribed to the Google Groups > "efloraofindia" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/indiantreepix. > For more options, visit https://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "efloraofindia" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/indiantreepix. For more options, visit https://groups.google.com/groups/opt_out.
