What are five key characteristics of the family Asteraceae?

Expert Solution

The family includes over 32,000 currently accepted species, in over 1,900 genera (list) in 13 subfamilies.This family is also known as Daisy family.

Habit: Herbs (Ageratum, Lactuca, Dahlia, Sonchus), shrubs (Inula, Senecio) rarely trees (Vernonia arborea and Leucomeris). Many of the plants are xerophytes (Proustia), hydrophytes (Cotula) some are semiaquatic (Caesulia axilaris).
Root: Tap root, sometimes modified into tubers (Dahlia).
Fruit: Absent; if present cypsela.
Seed: Non-endospermic.
Stem: The stem is erect, branched and cylindrical. It may be herbaceous or woody. It is pubescent (covered with soft short hair) and green in color.
Leaves: Simple leaves; entire and spathulate They are cauline or ramal, alternate or exstipulate. The leaves are sessile or petiolate, acute or serrate and with unicostate reticulate venation.
Flower: 2 kinds of florets (central tubular disc florets surrounded by peripheral ray florets) in the large capitulum. Bracteate, regular, epigynous, sessile. May be bisexual or unisexual, actinomorphic or zygomorphic
Pollen : The pollen of composites is typically echinolophate

gladiator answered 2 years ago

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