Iva annua

Linnaeus

Sp. Pl. 2: 988. 1753.

Synonyms: Iva annua var. caudata (Small) R. C. Jackson Iva annua var. macrocarpa (S. F. Blake) R. C. Jackson
Treatment appears in FNA Volume 21. Treatment on page 27. Mentioned on page 25.

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, glanddotted. 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

Distribution

V21-46-distribution-map.gif

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

None.
... more about "Iva annua"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
John L. Strother +
Linnaeus +
decurrent +
compound +  and simple +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
4.5 cm45 mm <br />0.045 m <br /> (8 cm80 mm <br />0.08 m <br />) +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
ovate;elliptic trullate or lanceolate +
8mm;45mm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
whitish +  and pinkish +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
scabrellous +
obcompressed +, plumply obovoid +  and pyriform +
fertile +  and bisexual +
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. +  and Mexico (Tamaulipas) +
10–500 m +
scabrellous +
staminate +  and pistillate +
winged +  and beaked +
dispersed +
Disturbed sites, moist soils +
disciform +  and discoid +
in corymbiform , glomerate , paniculiform , racemiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
scarious +  and membranous +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (1 cm10 mm <br />0.01 m <br />) +
hemispheric +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
conspicuous +
sessile +  and petiolate +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
2-carpellate +
spatulate;linear or setiform +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
membranous +
persistent +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering Jul–Nov. +
connate +  and distinct +
3 +  and 15 +
unequal +  and subequal +
bearing subulate enations +, hairy +  and bristly +
convex;hemispheric +
exalbuminous +
decumbent +  and sprawling +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Iva annua var. caudata +  and Iva annua var. macrocarpa +
Iva annua +
species +
campanulate +  and cylindric +
toothed +  and entire +
100 cm1,000 mm <br />1 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
50 cm500 mm <br />0.5 m <br /> (100 cm1,000 mm <br />1 m <br />) +
shrub +  and subshrub +