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Achenes that The Sunflower Family

Sunflower family members (Asteraceae)

The largest family members of flowering tree is the common sunflower family members (Asteraceae or Compositae). Follow to James L. Expose of the college of Maryland (personal communication, 2000), the family members contains almost 1550 genera and also 24,000 species. The sunflower family members is rivaled in size only by the orchid family members (Orchidaceae) with around 20,000 types and the legume household (Fabaceae) with around 18,000 species. In fact, if every the known species of flowering tree on planet were randomly lined up, every 4th one would certainly belong to the sunflower, orchid or legume families. The sunflower family consists of a an excellent diversity the species, including annuals, perennials, stem succulents, vines, shrubs and also trees. The is well-represented in parks and also gardens transparent the world, through bedding plants, floor covers and also shrubs. Familiar usual names, such together daisies, marigolds, zinnias, gazanias and also chrysanthemums every belong to this family. Throughout san Diego County and also the southwestern United states (where Wayne"s word is based), this family members is usually stood for by the largest number of wild varieties in coastal mountain and desert regions. In many areas of the world, members of this family make up 10 to 20 percent the the complete flora. The family likewise includes countless endemic species that only grow on one diverted mountain selection or island, such together the amazing silver knife (Argyroxiphium sandwicense var. Macrocephalum) endemic come Haleakala Crater top top the Hawaiian Island the Maui and also the beautiful Panamint daisy (Enceliopsis covillei) endemic come California"s Panamint Range. In addition, the family consists of many economically important herbs and also vegetables, and also has few of the world"s most widespread and successful weedy species with an extremely effective hitchhiker seeds and also seeds spread by wait currents.

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The large head of a sunflower (Helianthus annuus). The darker center of the head is composed of numerous disk flowers, each through an immature achene at the base. The decaying is surrounding by yellow, petal-like beam flowers and also leaflike bracts referred to as phyllaries. Go To Article about The Sunflower FamilyThe flower of a common sunflower is called a head. Since it is technically created of numerous individial flowers quite than a solitary flower, it is called an inflorescence. In the common sunflower, the external yellow petals are referred to as ray flowers, and the facility is composed of numerous disk flower crowded together. The whole head is subtended by numerous green bracts dubbed phyllaries. Every disk flower to produce a one-seeded achene in ~ its base, and also these achenes room the resource of sunflower seeds. Sunflower seeds provided for eating generally come native achenes with a striped pericarp, if seeds supplied for sunflower oil come indigenous solid black achenes.
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Close-up check out of a part of the big flowering head the a sunflower (Helianthus annuus) mirroring an external ring the large, strap-shaped (petal-like) beam flowers surrounding a dense mass that small, tubular decaying flowers. The ovaries that the disk flowers ripen right into the striped achenes sold in sectors as sunflower seeds. The whole head is subtended by green, overlapping bracts called phyllaries.

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Left: Mature particle head the a sunflower (Helianthus annuus) after ~ the decaying flowers and ray flowers have actually fallen off. The head is 12 inch (30 cm) in diameter and contains thousands of seed-bearing achenes. Right: Close-up watch of a part of the head showing numerous achenes embedded in the receptacle. Every achene is subtended by a small, green, chaffy bract (red arrow).
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.The huge seed-bearing head the a sunflower.Safflower oil originates from the spiny, thistlelike top of the safflower plant (Carthamus tinctorius). Choose the sunflower, the seeds are created inside one-seeded fruits dubbed achenes. Due to the fact that of its degree of polyunsaturation, the usage of safflower oil as an edible oil has declined. The oil oxidizes readily and must be maintained at short temperatures to maintain its flavor and also freshness. Today, health conscious people have actually switched come monounsaturated oils, such together olive oil (Olea europea) native the olive family members (Oleaceae) and also canola oil (B. Napus) from the mustard family members (Brassicaceae). The certain epithet "tinctorius" refers to the blossoms which were initially grown for your deep orange pigment called carthamin. This ancient pigment was provided for dyeing 2,000 year ago.
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