Difference between revisions of "Parthenium hysterophorus"
Sp. Pl. 2: 988. 1753.
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|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Ambrosiinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Ambrosiinae | ||
Latest revision as of 20:11, 5 November 2020
Annuals, (10–)30–120+ cm. Leaf blades ovate to elliptic, 30–180+ × 10–50(–90+) mm, (1–)2-pinnately lobed (ultimate lobes lanceolate to linear, 3–50 × 2–15 mm), faces sparsely to densely scabrellous and gland-dotted (seldom with additional erect hairs 1–2 mm). Heads obscurely radiate, borne in open, paniculiform arrays. Peduncles 1–8(–15+) mm. Phyllaries: outer 5(–6), lance-elliptic, 2–4 mm, inner 5(–6) ovate to ± orbiculate, 2.5–4 mm. Pistillate florets 5(–6); corolla laminae reniform or orbiculate to oblong, 0.3–1 mm. Disc florets 12–30[–60]. Cypselae obovoid, 1.5–2(–3.5) mm; pappus-like enations erect, deltate to ovate, 0.5–1 mm (sometimes a third, subulate spur near apex adaxially). 2n = 34.
Phenology: Flowering Mar–Nov.
Habitat: Disturbed sites
Elevation: 0–300 m
Distribution
Ala., Ark., Conn., Del., D.C., Fla., Ill., Kans., La., Md., Mass., Mich., Miss., Mo., N.J., N.Mex., N.Y., Ohio, Okla., Pa., Tex., Va., Mexico, introduced in subtropical, tropical, and warm-temperate New World and Old World.
Discussion
In some places, especially in Old World, Parthenium hysterophorus causes serious contact dermatitis in humans. The plants should be handled with caution.
Selected References
None.