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English: Diagram depicting a disk floret structure of family Asteraceae. The disk floret is bisexual with female parts (one pistil containing one style, two stigmas, and an ovary with one ovule) and male parts (stamen, anthers, and filaments).
Schemes and floral diagrams of the different floret types of the Asteraceae: Leucanthemum vulgare: a = disc flower; b = ray flower. 1 – style with stigmas 2 – anthers 3 – corolla ; typically, in the ray flower, three petals are joined to form a strap (in other species, five petals can fuse to form a ligule) 4 – reduced calyx
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As members of the family Asteraceae, dahlias have composite flower heads called capitula that are composed of multiple florets arranged in a central disc with surrounding petal-like rays. Each floret is a flower in its own right.
Gaillardia / ɡ eɪ ˈ l ɑːr d i ə / [3] (common name blanket flower) [4] is a genus of flowering plants in the family Asteraceae, native to North and South America.It was named after Maître Gaillard de Charentonneau, [5] [6] an 18th-century French magistrate who was an enthusiastic botanist.
Some leaves may display trinerved venation rather than the pinnate venation usual across Asteraceae. [1] The flower heads are usually of the radiate type (typical daisy flower heads with distinct ray and disc florets) but sometimes discoid (with only disc florets of mixed, sterile, male and types). Only ray florets are female, others are male ...
In the center of the flower baskets is a large number of tubular flowers (also called disc florets), whose overgrown petals are yellow, turn white in the lower part and reach a length of 5-6 mm. The anthers are brownish-black and about 3 mm long, at the tips are short-triangular, translucent attachments with a length of 0.5-0.8 mm.
Heterotheca comes from Ancient Greek ἕτερος héteros "other, different" and θήκη thḗkē "case, chest", and refers to the fact that, in some species in the genus, the cypselae (achenes containing seed) of the disk and ray florets have different shapes.