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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.
Symphyotrichum lateriflorum is a clump-forming perennial that grows 20–120 centimeters (3 ⁄ 4 –4 feet) tall and up to 30 cm (1 ft) wide. [4] Herbaceous and with alternate leaves, [5] it can have a different appearance throughout its lifespan or a season.
The plants are 20 to 150 centimeters (3 ⁄ 4 to 5 feet) tall with one to several herbaceous stems. The alternate and simple leaves have a rough texture. The composite flowers, produced between August and October, have blue to violet rays. [3] Leaf, Ontario, Canada Large inflorescence showing many involucres
An Oligocene (34 – 23 Mya) pollen is known for Asteraceae and Goodeniaceae, and seeds from Oligocene and Miocene (23 – 5.3 Mya) are known for Menyanthaceae and Campanulaceae respectively. [5] According to molecular clock calculations, the lineage that led to Asterales split from other plants about 112 million years ago [ 6 ] or 94 million ...
Ageratum (/ ə ˈ dʒ ɛr ə t ə m /) [2] (whiteweed in the US) is a genus of 40 [3] to 60 tropical and warm temperate flowering annuals and perennials from the family Asteraceae, tribe Eupatorieae. Most species are native to Central America and Mexico but four are native to the United States. [3] They form tussocks or small hills.
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.
Chrysopsis (golden asters) are plants in the family Asteraceae native to the southern and eastern United States. All the species are found in Florida, although some are found in other states as well. [2] [3] [4] These are annual and perennial herbs bearing daisy-like flower heads with yellow disc florets and usually yellow ray florets.
Symphyotrichum pilosum (formerly Aster pilosus) is a perennial, herbaceous, flowering plant in the Asteraceae family native to central and eastern North America. It is commonly called hairy white oldfield aster, frost aster, white heath aster, heath aster, hairy aster, common old field aster, old field aster, awl aster, nailrod, and steelweed.