Stachys annua
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Description: Photograph and information on annual woundwort, its morphology, biology, distribution, ecology and economic significance as a weed species.
AgroAtlas - Weeds - Stachys annua L. - Annual Woundwort Family Lamiaceae, genus Stachys L. Stachys neglecta Klok. ex Kossko. It is an annual spring or winter weed. Plant is 15-35 cm tall; stems are simple or ramified, often hairless at base, with soft, short, downwardly directed hairs at top, with denser hairs under inflorescences. Lower leaves are wedge-shaped at base, oblong-ovate, crenate; upper leaves are lanceolate, sharp, serrated; top leaves are reduced, sessile. Bracts are filiform or linear, long-ciliated. Inflorescence is long, spike-shaped; two or three lower whorls are sparse; upper whorls are connivent. Calyx is somewhat hairy; its teeth are triangular-lanceolate, becoming spiniform upward, arcuate, as long as tube. Corolla is whitish-yellowish, two times longer than calyx; upper labia rounded; lower labia has emarginated middle lobe and rounded-ovate lateral lobes. Seeds are widely-ovate, obtuse-trihedral, fine-meshed. The mass of 1000 seeds is 0.75-1.25 g. The maximal fecundity of one plant is 26,400 seeds. Seeds germinate from depths of not more than 6 cm. The flowering period occurs in June-August.
Size: 1132 chars
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| Page title: | AgroAtlas - Weeds - Stachys annua L. - Annual Woundwort |
| Keywords: | interactive atlas map economic plant distribution area vegetation diseases pest weed USSR agriculture Russia geography GIS NIS biology photo nature geographic information system handbook ecological maps research investigation pictures download description |
| Description: | description |
| IP-address: | 195.70.197.2 |
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| Date | created: 2005.05.04 Last updated on 2014.03.05 07:11:36 MSK |