Iva annua

Annuals, (10–)50–100(–150+) cm. Stems erect. Leaves: petioles 5–20(–30) mm; blades deltate or ovate to elliptic, trullate, or lanceolate, 30–100(–150)+ × 8–45(–80) mm, margins ± toothed, faces ± scabrellous, gland-dotted. Heads in ± spiciform arrays. Peduncles 0–1 mm. Involucres ± hemispheric, 3–4(–5) mm. Phyllaries: outer 3–5 distinct, ± herbaceous. Paleae linear, 2–2.5 mm. Pistillate florets 3–5; corollas 0.5–1 mm. Functionally staminate florets 8–12+; corollas 2–2.5 mm. Cypselae 2–3 mm. 2n = 34.

Phenology: Flowering Jul–Nov.
Habitat: Disturbed sites, moist soils
Elevation: 10–500 m

Ala., Ark., Colo., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Mass., Mich., Miss., Mo., Nebr., N.Mex., N.C., N.Dak., Ohio, Okla., Pa., S.C., S.Dak., Tenn., Tex., Va., W.Va., Wis., Mexico (Tamaulipas).

Discussion

Selected References

None.

Lower Taxa