Thanks Sukla ji for the details about these genera.
Dr Satish Phadke On 13 February 2014 10:36, Gurcharan Singh <[email protected]> wrote: > 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. > -- You received this message because you are subscribed to the Google Groups "efloraofindia" group. 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