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The Asteraceae were first described in the year 1740 and given the original name Compositae. [6] The family is commonly known as the aster, daisy, composite, or sunflower family. Most species of Asteraceae are herbaceous plants, and may be annual, biennial, or perennial, but there are also shrubs, vines, and trees.
Aster amellus is the type species of the genus and the family Asteraceae. [1] The name Aster comes from the Ancient Greek word ἀστήρ (astḗr), meaning 'star', referring to the shape of the flower head. Many species and a variety of hybrids and varieties are popular as garden plants because of their attractive and colourful flowers.
Therefore, the AG mutants are devoid of androecium and gynoecium and they have petals and sepals in their place. In addition, the growth in the centre of the flower is undifferentiated, therefore the petals and sepals grow in repetitive verticils. The PLENA (PLE) gene is present in A. majus, in place of the AG gene, although it is not an ortholog.
Asterales are common plants and have many known uses. For example, pyrethrum (derived from Old World members of the genus Chrysanthemum) is a natural insecticide with minimal environmental impact. [10] Wormwood, derived from a genus that includes the sagebrush, is used as a source of flavoring for absinthe, a bitter classical liquor of European ...
Asteraceae or Compositae is a family of flowering plants (anthophytes) in the order Asterales. Asteraceae (commonly referred to as the aster , daisy , composite , [ 1 ] or sunflower family ), is a very large and widespread family, [ 2 ] [ 3 ] which includes over 32,000 currently accepted species, in over 1,900 genera ( list ) in 13 subfamilies ...
The corolla is gametopetalous, the five petals may be joined forming a tube with 4 or 5 lobes (in the flower called tubulose flower or floret, or two groups of petals joined (in the case of bilabiated flowers, with an upper lip formed by 2 petals and a lower lip formed by 3 petals), or they can present a short tube and the limb prolonged ...
The flowers have seven to nine, often even more, white egg-shaped petals. The sepals are lanceolate. [6] Silene nutans (Nottingham catchfly, Caryophyllaceae) shows ensiform-lanceolate leaves. The slightly rosette-like ground leaves are bigger and of different shape than the sparse, opposite leaves on the stem. [6]
open – petals or sepals do not overlap or even touch each other . reduplicate – folded outwards. valvate – margins of adjacent petals or sepals touch each other without overlapping. vexillary – a special type of aestivation occurring in plants like pea; in this type of aestivation a large petal called standard encloses two smaller petals.