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IMG_8279WAFLI
A Sunflower - @ New Town Eco Park (officially Prakriti Tirtha) - Calcutta, India.
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Helianthus or sunflower is a genus of plants comprising about 70 species. Except for three species in South America, all Helianthus species are native to North America. The common name, "sunflower", typically refers to the popular annual species Helianthus annuus, or the common sunflower, whose round flower heads in combination with the ligules look like the sun. This and other species, notably Jerusalem artichoke (H. tuberosus), are cultivated in temperate regions and some tropical regions as food crops for humans, cattle, and poultry, and as ornamental plants.
Perennial sunflower species are not as popular for gardens due to their tendency to spread rapidly and become invasive. The whorled sunflower, H. verticillatus, was listed as an endangered species in 2014 when the U.S. Fish and Wildlife Service issued a final rule protecting it under the Endangered Species Act. The primary threats are industrial forestry and pine plantations in Alabama, Georgia, and Tennessee. They grow to 1.8 m (6 ft) and are primarily found in woodlands, adjacent to creeks and moist, prairie-like areas.
Sunflowers are usually tall annual or perennial plants that in some species can grow to a height of 300 cm (120 in) or more. They bear one or more wide, terminal capitula (flower heads), with bright yellow ray florets at the outside and yellow or maroon (also known as a brown/red) disc florets inside. Several ornamental cultivars of H. annuus have red-colored ray florets; all of them stem from a single original mutant.[8] During growth, sunflowers tilt during the day to face the sun, but stop once they begin blooming. This tracking of the sun in young sunflower heads is called heliotropism. By the time they are mature, sunflowers generally face east. The rough and hairy stem is branched in the upper part in wild plants, but is usually unbranched in domesticated cultivars. The petiolate leaves are dentate and often sticky. The lower leaves are opposite, ovate, or often heart-shaped.
They are distinguished technically by the fact that the ray florets (when present) are sterile, and by the presence on the disk flowers of a pappus that is of two awn-like scales that are caducous (that is, easily detached and falling at maturity). Some species also have additional shorter scales in the pappus, and one species lacks a pappus entirely. Another technical feature that distinguishes the genus more reliably, but requires a microscope to see, is the presence of a prominent, multicellular appendage at the apex of the style. Sunflowers are especially well known for their symmetry based on Fibonacci numbers and the golden angle.
Quite a bit of variability is seen among the perennial species that make up the bulk of those in the genus. Some have most or all of the large leaves in a rosette at the base of the plant and produce a flowering stem that has leaves that are reduced in size. Most of the perennials have disk flowers that are entirely yellow, but a few have disk flowers with reddish lobes. One species, H. radula, lacks ray flowers altogether.
Helianthus species are used as food plants by the larvae of many lepidopterans. The seeds of H. annuus are used as human food.
Source : en.wikipedia.org/wiki/Helianthus
New Town Eco Park (officially Prakriti Tirtha) is an urban park in Rajarhat, Kolkata. The park is situated on a 480 acres (190 ha) plot and will surround a 104 acres (42 ha) waterbody with an island in the middle. The park was conceptualised by Chief Minister of West Bengal, Mamata Banerjee in July 2011. West Bengal Housing Infrastructure Development Corporation (HIDCO) is the overarching body coordinating the construction of the park, along with different other government bodies responsible for implementation of different works inside the park. The park has been divided into three broad parts; 1) ecological zones like wetlands, grasslands, and urban forest, 2)theme gardens and open spaces, 3)and urban recreational spaces. The Eco Park will be further divided into different sub-parts according to the different types of fauna planted. The park was inaugurated on 29 December 2012 by Mrs.Mamata Banerjee, Chief Minister of West Bengal.
Source : Internet
IMG_8279WAFLI
A Sunflower - @ New Town Eco Park (officially Prakriti Tirtha) - Calcutta, India.
______________________________________________________________________ _______________
Copyright © learning.photography.
All rights reserved. All images contained in this Photostream remain the property of learning.photography and is protected by applicable Copyright Law. Any images from this Photostream may not be reproduced, copied, or used in any way without my written permission.
Thanks for your Visit, Comments, Favs and Awards !
No private group or multiple group invites please !
Those who have not uploaded any photograph yet, or have uploaded a very few photographs, should not mark me Contacts or comment on my photo. I may block them.
______________________________________________________________________ _______________
Helianthus or sunflower is a genus of plants comprising about 70 species. Except for three species in South America, all Helianthus species are native to North America. The common name, "sunflower", typically refers to the popular annual species Helianthus annuus, or the common sunflower, whose round flower heads in combination with the ligules look like the sun. This and other species, notably Jerusalem artichoke (H. tuberosus), are cultivated in temperate regions and some tropical regions as food crops for humans, cattle, and poultry, and as ornamental plants.
Perennial sunflower species are not as popular for gardens due to their tendency to spread rapidly and become invasive. The whorled sunflower, H. verticillatus, was listed as an endangered species in 2014 when the U.S. Fish and Wildlife Service issued a final rule protecting it under the Endangered Species Act. The primary threats are industrial forestry and pine plantations in Alabama, Georgia, and Tennessee. They grow to 1.8 m (6 ft) and are primarily found in woodlands, adjacent to creeks and moist, prairie-like areas.
Sunflowers are usually tall annual or perennial plants that in some species can grow to a height of 300 cm (120 in) or more. They bear one or more wide, terminal capitula (flower heads), with bright yellow ray florets at the outside and yellow or maroon (also known as a brown/red) disc florets inside. Several ornamental cultivars of H. annuus have red-colored ray florets; all of them stem from a single original mutant.[8] During growth, sunflowers tilt during the day to face the sun, but stop once they begin blooming. This tracking of the sun in young sunflower heads is called heliotropism. By the time they are mature, sunflowers generally face east. The rough and hairy stem is branched in the upper part in wild plants, but is usually unbranched in domesticated cultivars. The petiolate leaves are dentate and often sticky. The lower leaves are opposite, ovate, or often heart-shaped.
They are distinguished technically by the fact that the ray florets (when present) are sterile, and by the presence on the disk flowers of a pappus that is of two awn-like scales that are caducous (that is, easily detached and falling at maturity). Some species also have additional shorter scales in the pappus, and one species lacks a pappus entirely. Another technical feature that distinguishes the genus more reliably, but requires a microscope to see, is the presence of a prominent, multicellular appendage at the apex of the style. Sunflowers are especially well known for their symmetry based on Fibonacci numbers and the golden angle.
Quite a bit of variability is seen among the perennial species that make up the bulk of those in the genus. Some have most or all of the large leaves in a rosette at the base of the plant and produce a flowering stem that has leaves that are reduced in size. Most of the perennials have disk flowers that are entirely yellow, but a few have disk flowers with reddish lobes. One species, H. radula, lacks ray flowers altogether.
Helianthus species are used as food plants by the larvae of many lepidopterans. The seeds of H. annuus are used as human food.
Source : en.wikipedia.org/wiki/Helianthus
New Town Eco Park (officially Prakriti Tirtha) is an urban park in Rajarhat, Kolkata. The park is situated on a 480 acres (190 ha) plot and will surround a 104 acres (42 ha) waterbody with an island in the middle. The park was conceptualised by Chief Minister of West Bengal, Mamata Banerjee in July 2011. West Bengal Housing Infrastructure Development Corporation (HIDCO) is the overarching body coordinating the construction of the park, along with different other government bodies responsible for implementation of different works inside the park. The park has been divided into three broad parts; 1) ecological zones like wetlands, grasslands, and urban forest, 2)theme gardens and open spaces, 3)and urban recreational spaces. The Eco Park will be further divided into different sub-parts according to the different types of fauna planted. The park was inaugurated on 29 December 2012 by Mrs.Mamata Banerjee, Chief Minister of West Bengal.
Source : Internet