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A typical Asteraceae flower head showing the (five) individual ray florets and the (approximately 16) disk florets of a specimen of (Bidens torta) In plants of the Asteraceae, what appears to be a single "daisy"-type flower is actually a composite of several much smaller flowers, known as the capitulum or head.
Tridax procumbens, commonly known as coatbuttons [2] or tridax daisy, is a species of flowering plant in the family Asteraceae. It is best known as a widespread weed and pest plant. It is native to the tropical Americas including Mexico, [1] but it has been introduced to tropical, subtropical, and mild temperate regions worldwide.
The 15–33 ray florets are blue, pink, purple, or white, with a length averaging 5–7 mm (1 ⁄ 5 – 3 ⁄ 10 in) [c] and width of 1–1.7 mm (1 ⁄ 24 – 1 ⁄ 16 in). [5] Ray florets in the Symphyotrichum genus are exclusively female, each having a pistil (with style , stigma , and ovary ) but no stamen ; thus, ray florets accept pollen ...
There are 16–20 ray florets (sometimes as few as 12) which are usually white, but may rarely be pink. The ray florets are 5–8 mm long and 0.5–1.2 mm wide. Ray florets in the Symphyotrichum genus are exclusively female, each having a pistil (with style , stigma , and ovary ) but no stamen ; thus, ray florets accept pollen and each can ...
Ray florets in the Symphyotrichum genus are exclusively female, each having a pistil (with style, stigma, and ovary) but no stamen. Ray florets accept pollen and each can develop a seed, but they produce no pollen. [6] The ray florets of S. lateriflorum bloom earlier and are likely receptive to pollen longer than the disk florets. [15]
The head has up to 36 yellow ray florets and many yellow disc florets. The fruit has a short pappus. [5] There are two varieties of the species: [5] Silphium integifolium var. integrifolium – 40 to 200 cm (1 ft 4 in to 6 ft 7 in) in height
Tanacetum parthenium, known as feverfew, [1] is a flowering plant in the daisy family, Asteraceae. It may be grown as an ornament, and may be identified by its synonyms, Chrysanthemum parthenium and Pyrethrum parthenium. It is used in traditional medicine.
The 10–24 fertile ray florets are nearly white, blue to pink, lavender, purple or blue violet. The sterile disc florets are yellowish. The peduncles are nearly naked. [7] They have a chromosome base number of x = 9. [7] [8] Species [2] [9] [10] Ionactis alpina (Nutt.) Greene - Lava ankle-aster - California Nevada Oregon Idaho Utah Wyoming Montana