Morphological characteristics
Xanthium, annual herb, high 20-90cm. Root spindle, branched or unbranched. Stems erect without branching or with few branches, cylindrical at lower part, longitudinally furrowed at upper part, grayish with strigose. Leaves alternate; long-handled, 3-11 cm long; leaf blade triangular-ovate or heart-shaped, 4-9 cm long, 5-10 cm wide, entire, or 3-5 inconspicuously lobed, sharp or blunt, Three veins are formed, green above, pale below, rough or short white hairs. Inflorescences subsessile, polysperous, unisexual and homogeneous; male inflorescences globose, involucre bracts, total sepals small, 1 column, densely connate, receptacle columnar, brackets obliquely lanceolate, florets tubular, apex 5 dentate, stamens 5, anthers oblong-linear; female inflorescences ovate, sepals 2-3 columns, outer sepals small, inner sepals large, saccate ovate, 2-celled hardware, There are barbed hairs on the outside, 2 cone-shaped tips on the top, 2 flowers, and no corolla. The ovary is in the interior, with 1 flower per room, style linear, and prominent outside the main frame. Mature, achene-tolerant villas hard, oval or elliptical, with the same minister 12-15mm, width 4-7mm, green, light yellow or reddish brown, 1.5-2.5mm long; achenes 2, obovate, achenes Contains 1 seed. Flowering from July to August, fruiting from September to October.
The difference between the Mongolian cocklebur fruit and the cocklebur fruit is that the axillary fruit has an achene with an elliptic shape, the cockroach is 18-20mm long, and the width is 8-10mm. The external sting is more sparse. The total sting is hard and the sting is long. 2-5.5mm (usually 5mm) with thick base.
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