ANNUAL SUMPWEED
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| File Size: 104 KB |
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Iva annua L.
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| Barton County, Kansas |
| Annual |
| Height: 8-48 inches |
| Family: Asteraceae - Sunflower Family |
| Flowering Period: August, September,October |
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| Also Called: | | Annual marshelder. | | Stems: | | Usually erect, usually branched. | | Leaves: | | Cauline, mostly opposite, distal sometimes alternate; petiole .2 to 1.2 inch; blade deltate to ovate, lanceolate, or elliptic, 1.2 to 6 inches long, .4 to 3.2 inches wide, base acute to acuminate or truncate, margins coarsely serrate, surfaces rough. | | Inflorescences: | | Heads discoid, sessile in spike-like arrays, solitary in axils of linear to ovate bracts, containing both pistillate and staminate florets, pistillate florets peripheral, staminate central; peduncles short; involucral 1/6 to 1/5 inch across, involucral bracts 3-5, subtending the mature achenes. | | Flowers: | | Pistillate florets 3-5; corolla white, tubular, 1/50 to 1/25 inch. Staminate florets 8-12; corolla white, funnelform, 1/12 to 1/10 inch, lobes 5. | | Fruits: | | Achenes brown to brownish black, obovoid to pyriform, 1/12 to 1/6 inch, pappus absent. | | Habitat: | | Moist ground in disturbed sites | | Distribution: | | East 6/7 of Kansas | | Origin: | | Native |
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