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The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today. The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

Ladybug on sunflower

Closeup of a Ladybug (Coccinellidae) on a sunflower (Helianthus annuus). Closeup of a Ladybug (Coccinellidae) on a sunflower (Helianthus annuus).

Field of Sunflowers

Field of Sunflowers in Bulgaria

Colourful helianthus

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today. The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

Sunflower, Helianthus annuus

Sunflower, Helianthus annuus, isolated on a black background

Single sunflower (helianthus annuus)

Single sunflower (helianthus annuus)

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today. The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

Primary xylem and phloem the herbaceous dicot stem: Helianthus

cross section: Helianthus stem magnification: 400x. cross section: Helianthus stem magnification: 400x

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today. The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

Topinambur flowers

Macro of Italy, countryside, topinambur flowers (HELIANTHUS TUBEROSUS) flowers (HELIANTHUS TUBEROSUS)

Helianthus

Colourful helianthus

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today. The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

Part of one flourishing sunflower isolated. Part of one flourishing sunflower isolated

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

Sunflower in garden, clear blue sky, selective focus,

Helianthus annuus,

Sand hill and helianthus

Mogao Grottoes – the oldest Buddhist Holy Land of China – is located in a river valley between the Sanwei and Mingsha hills 25 kilometers away from southeastern Dunhuang. As recorded in a stone inscription of the Tang Dynasty, stones were first carved here around 360 AD.This is Mingsha hills. Mogao Grottoes – the oldest Buddhist Holy Land of China – is located in a river valley between the Sanwei and Mingsha hills 25 kilometers away from southeastern Dunhuang. As recorded in a stone inscription of the Tang Dynasty, stones were first carved here around 360 AD.This is Mingsha hills.

Sunflower was dying

Sunflower or Helianthus annuus was coming to an end of its life. Sunflower or Helianthus annuus was coming to an end of its life.

Inflorescence (flowering head) and leaves of sunflower, helianthus annuus, family asteraceae

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today. The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

Sunflower and Bumble Bee

A Closeup shot of a bumblebee (Bombus spp.) looking for nectar on a sunflower (Helianthus annuus) head. A Closeup shot of a bumblebee (Bombus spp.) looking for nectar on a sunflower (Helianthus annuus) head.

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

Vector composition with outline open Sunflower or Helianthus flower and leaves isolated on white background. Floral border.

Vector composition with outline open Sunflower or Helianthus flower and leaves isolated on white background. Floral border.

Heart from the roots of fresh organic topinambur or jerusalem artichoke Helianthus tuberosus on wooden background. Diabetic friend

Heart from the roots of fresh organic topinambur or jerusalem artichoke Helianthus tuberosus on wooden background. Diabetic friend

sunflower helianthus annuus in the field at dusk close up of fresh growing backlit by light setting sun august poland

sunflower helianthus annuus in the field at dusk close up of fresh growing backlit by light setting sun august poland

Helianthus or red sunflowers illustration isolated

Beautiful nature illustration with textured petals and leaves of the red sunflower. White background with this grouping of flowers. Beautiful nature illustration with textured petals and leaves of the red sunflower. White background with this grouping of flowers.

Sunflower (lat. Helianthus) at summertime, Germany

Sunflower (lat. Helianthus) at summertime, Germany

Herbaceous Dicot Stem: Parenchymatous Pith in Older Helianthus

cross section: Older stem: Helianthus common name: Sunflower magnification: 100x All vascular tissues in Helianthus are the product of primary growth. There are no signs of secondary growth (growth rings or lateral meristems) as might be seen in woody stems. The uniseriate and cutinized epidermis contains large multicellular trichomes and occasional stomata. The cortex consists of an outermost hypodermis of heavy walled collenchyma, a deeper layer of parenchyma and a deepest band of endodermis (starch sheath). Within the stele the vascular bundles are arranged in a ring and separated from each other by wide medullary rays of parenchyma cells. The collaterally arranged vascular bundles are almost entirely primary phloem and xylem. Each bundle consists of a large outer supportive cap of sclerenchyma fibers (phloem fiber cap), a deeper layer of primary phloem with well-defined sieve tubes and companion cells, and a deepest layer of primary xylem. In between the xylem and phloem, a narrow band of cambium may be seen. In some preparations, the highly lignified cells walls of xylem and mature sclerenchyma are stained red orange. These cells are dead at maturity and can also be distinguished by a heavy cell wall and absence of cytoplasm. The center of the stem is occupied by a pith of parenchyma cells that contain numerous starch storing amyloplasts. cross section: Older stem: Helianthus common name: Sunflower magnification: 100x All vascular tissues in Helianthus are the product of primary growth. There are no signs of secondary growth (growth rings or lateral meristems) as might be seen in woody stems. The uniseriate and cutinized epidermis contains large multicellular trichomes and occasional stomata. The cortex consists of an outermost hypodermis of heavy walled collenchyma, a deeper layer of parenchyma and a deepest band of endodermis (starch sheath). Within the stele the vascular bundles are arranged in a ring and separated from each other by wide medullary rays of parenchyma cells. The collaterally arranged vascular bundles are almost entirely primary phloem and xylem. Each bundle consists of a large outer supportive cap of sclerenchyma fibers (phloem fiber cap), a deeper layer of primary phloem with well-defined sieve tubes and companion cells, and a deepest layer of primary xylem. In between the xylem and phloem, a narrow band of cambium may be seen. In some preparations, the highly lignified cells walls of xylem and mature sclerenchyma are stained red orange. These cells are dead at maturity and can also be distinguished by a heavy cell wall and absence of cytoplasm. The center of the stem is occupied by a pith of parenchyma cells that contain numerous starch storing amyloplasts.

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

Sunflower... selective focus, Helianthus annuus,

The Helianthus on white background

Colourful helianthus

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today. The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

The Helianthus on white background

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

Single yellow flower helianthus tuberosus

single yellow flower helianthus tuberosus on blurred green background

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

Beautiful sunflowers Helianthus - collage

Beautiful sunflowers Helianthus - collage

Sunflower in garden, clear blue sky, selective focus,

Helianthus annuus,

Sunflower, Helianthus annuus

Sunflower, Helianthus annuus, isolated on a white background

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today. The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

Jerusalem artichoke Helianthus tuberosus grows in nature

Jerusalem artichoke Helianthus tuberosus grows in nature

Sunflower (helianthus annuus)

Sunflower (helianthus annuus)

Helianthus tuberosus

Yellow flowers isolated on white. Helianthus tuberosus

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today. The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

Tall Sunflower 846048

Tall Sunflower 846048

Sunflowers (Helianthus annuus)

Sunflowers (Helianthus annuus)

Topinambur (Helianthus tuberosus)on white backgro

Topinambur (Helianthus tuberosus)on white backgro

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

The Helianthus on white background

Jerusalem artichoke sunroot tubers. Helianthus tuberosus closeup on the table, horizontal top view

Jerusalem artichoke sunroot tubers. Helianthus tuberosus closeup on the table, horizontal top view

Decorative Sunflower - Helianthus

Studio photograph of a decorative sunflower that has no seeds. An ornamental plant. Studio photograph of a decorative sunflower that has no seeds. An ornamental plant.

The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today. The Helianthus L. genus comprises 67 species and several subspecies in the Asteraceae family, all of which are native to North America. However, at least the two species Helianthus annuus (sunflower) and Helianthus tuberosus (Jerusalem artichoke) are cultivated in Europe and other parts of the world today.

Single sunflower (helianthus annuus)

Single sunflower (helianthus annuus)

Macro Shot of Sunflower

Macro close up shot of sunflower Helianthus annuus. Macro close up shot of sunflower Helianthus annuus

Sunflower, Species, Helianthus annuus, crop landscape, Andalusia

Sunflower, Species, Helianthus annuus, crop landscape, Andalusia

Sunflower in garden, clear blue sky, selective focus,

Helianthus annuus,

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