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Ambrosia confertiflora DC.

Kingdom: Plantae Rank: Species Parent: Ambrosia Status: Valid

Common Names:

  • FIELD RAGWEED - English, United States of America
  • BUR-SAGE - English, United States of America

Morphological Description

Diagnosis: Perennial, forming colonies; stems 0.3–0.6(–1.8) m tall; leaves alternate, 1–4 times pinnatifid, often with 1–several pair of small lobes on the petiolar bases below the main blade; staminate heads short-stalked; "fruits" ca. 5 mm long, the spines usually (0–)10–20, ca. 1–2 mm long, with hooked tips.


Notes: Disturbed areas; mainly w 1/2 of TX e to Brown and Mills cos. on w margin of nc TX, disjunct e to Dallas Co. Mostly Aug–Nov. (confertiflora: with flowers crowded together)