Matricaria discoidea

Annuals, (1–)4–40(–50) cm; aromatic (pineapple odor when bruised). Stems 1–10+, usually erect or ascending, sometimes decumbent, branched from bases. Leaf blades (5–)10–65(–85) × 2–20 mm. Heads discoid, (1–)4–50(–300), usually borne singly, sometimes in open, corymbiform arrays. Peduncles 2–25(–30) mm (sometimes villous near heads). Involucres 2.5–3.8 mm. Phyllaries 29–47+ in 3 series, margins mostly entire. Receptacles 2.5–7.5 mm, ± acute or obtuse. Ray florets 0. Discs hemispheric to broadly ovoid, 4–7(–11) × 4–7.5(–10) mm. Disc florets 125–535+; corollas greenish yellow, 1.1–1.3 mm (± glandular), lobes 4(–5). Cypselae pale brown to tan, ± cylindric-obconic (asymmetric, abaxially ± gibbous distally), 1.15–1.5 mm, ribs white (lateral 2 each with reddish brown mucilage gland along ± entire length, glands sometimes distally expanded, abaxial 1–2 weak, sometimes each with elongate mucilaginous gland), faces not glandular; pappi coroniform, entire. 2n = 18. [as M. matricarioides]

Matricaria Discoidea

Matricaria discoidea

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