Identification and Control of Common Weeds: Volume 3 by Zhenghao Xu & Le Chang

Author:Zhenghao Xu & Le Chang
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

1.Root: Taper root inconspicuous with numerous fibrous roots.

2.Stem: Erect, simple, or branched from middle or lower part, sometimes lower branchlets creeping and with adventitious roots on nodes. Stems and branches purple-red, green, or straw-colored, often covering white tomentose or thinly lanate, upper branches or branchlets axillary densely hairy, expanding. Plants up to 30–50 cm tall.

3.Leaf: Opposite or upper leaves alternate. Leaf blades broadly ovate or triangular-ovate, 2–6 cm long, 1.5–3.5 cm wide, or length equal to width, base cordate or truncate, margin crenate-serrate, apex rounded or acute. Median cauline leaves bigger, upper and axillary leaves smaller. All leaves basally 3-veined or inconspicuously 5-veined, both surfaces sparsely or densely white pubescent. Petiole 0.7–3 cm. Petioles of upper leaves and axillary branches usually spreading white long tomentose.

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