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Ray flower | plant anatomy | Britannica - Encyclopedia Britannica These rays are the petal-like parts, in a comparison of the flower head to an ordinary… …for instance, the outer (or ray) flowers have a well-developed zygomorphic corolla, and the inner (disk) flowers have a small actinomorphic corolla The inner disk flowers generally are complete flowers, and the ray flowers generally are sterile
Asteraceae - Wikipedia A ray flower is a two - or three-lobed, strap-shaped, individual flower, found in the head of most members of the Asteraceae [15] [16] The corolla of the ray flower may have two tiny, vestigial teeth, opposite to the three-lobed strap, or tongue, indicating its evolution by fusion from an ancestral, five-part corolla In some species, the 3:2
Common Sunflower - US Forest Service Each head generally has 13 to 30 ray flowers that are 2 5 to 5 centimeters (1 to 2 inches) long, and 150 to more than a thousand-disc flowers Both the ray and disc flowers are yellow (reddish rays in some cultivated forms)
Composite Flowers - Backyard Nature Here are the three basic flower-head types: Heads composed of only ray flowers, as in dandelion (shown at the right), chicory, endive, and wild lettuce Heads composed of only disc flowers, as in eupatorium (the white flowers at the right), ageratum, thistles, and burdock
Ray Flower - Definition, Usage Quiz | R - Ultimate Lexicon A ray flower is one of the marginal flowers in the heads of many members of the Asteraceae family (composites), such as daisies, sunflowers, and asters These flowers typically have a strap-shaped corolla, and are often mistaken for petals
Ray flower - Definition of Ray flower - Health Benefits Times The strap-like, often sterile flowers (commonly called petals) surrounding the flower head (disk) of a plant in the Composite family, such as the yellow rays of Sunflowers or the purple rays surrounding the cone of Purple Coneflower
Capitulum, Disk, Disk Floret, Floret, Ligule, Ray Floret ray [ rey ] floret noun: one of the strap-shaped marginal flowers of the head in a composite plant Can you identify which of the plants pictured below have the same flowering structure? Left to right: Helianthus annuus, Lactuca sativa, Coreopsis verticillata, Tanacetum vulgare
Field Thistle - US Forest Service The ray flowers look like petals, but each is actually an individual flower The disk flowers are at the center of the head, inside the ring of ray flowers Thistles have all disc flowers that are shaped into long tubes About 200 species are known worldwide from North America, Europe and Asia