WorldFloraDB - Iva annua

Characteristics

Annual weed 0.5–2 m; stem glabrous below, strigose near the middle, commonly spreading-hirsute above; lvs chiefly opposite (only some of the reduced upper ones alternate), petiolate, lanceolate to broadly ovate, ± serrate, acuminate, 5–15 × 2–7 cm, scaberulous-strigose; infl of several or many spiciform branches, the heads practically sessile in the axils of reduced, ovate to lance-linear, conspicuously ciliate-margined lvs 5–20 mm; invol 2–3.5 mm, its bracts 3–5, subtending the achenes, sparsely long-hirsute, broad and ciliate distally; pistillate fls with tubular cor 1–1.5 mm tending to persist on the resinous-dotted achene, sometimes subtended by very slender and inconspicuous receptacular bracts; 2n=34. Waste ground, especially in moist soil; Ind. to N.D., s. to Miss. and N.M., and occasionally intr. eastward. Sept., Oct. (I. caudata; I. ciliata)

More

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.

A herb. It grows 60-100 cm high.

Life form

annual

Growth form

herb

Growth support

free-standing

Foliage retention

-

Sexuality

hermaphrodite

Pollination

-

Spread

-

Mature width (meter)

-

Mature height (meter)

0.6 - 1.0

Root system

-

Rooting depth (meter)

-

Root diameter (meter)

-

Flower color

Blooming months

Jan	Feb	Mar
Apr	May	Jun
Jul	Aug	Sep
Oct	Nov	Dec

Fruit color

-

Fruiting months

-

Nitrogen fixer

-

Photosynthetic pathway

-

Environment

It is a temperate plant.

Light	-
Soil humidity	-
Soil texture	-
Soil acidity	-
Soil nutriment	-
Hardiness (USDA)

Usage

The seeds are oily and nutritious.

Uses	oil
Edible	seeds
Therapeutic use	-
Human toxicity	-
Animal toxicity	-

Cultivation

Mode	-
Germination duration (days)	-
Germination temperacture (C°)	-
Germination luminosity	-
Germination treatment	-
Minimum temperature (C°)	-
Optimum temperature (C°)	-
Size	-
Vigor	-
Productivity	-