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(Last Modified On 4/4/2013)
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(Last Modified On 4/4/2013)
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Genus
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Stachys L.
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PlaceOfPublication
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Sp. P1. 580, 1753.
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Description
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Herbs, annual or perennial, rarely half shrubs or shrubs, usually pubescent. Leaves simple, opposite, pinnately-nerved, petiolate or subsessile. Inflorescences verticils, 4-oo flowered, appearing as spikes, the bracts leaf-like or absent. Flowers perfect, subsessile or shortly pedicellate; bracteoles generally apparent; calyx weakly zygomorphic, the teeth subequal and frequently aristate or spinulose-tipped; corolla tubular, exserted or included, purple to pink, the tube frequently con- stricted above the nutlets, sometimes witlh a spur on the lower side, bilabiate, the upper lip subgaleate and 2-lobed, the lower lip 3-lobed, the central lobe largest, sometimes with a pilose annular ring above the nutlets; stamens 4, paired, slightly exserted or inclosed in the upper lip, the filaments distinct, glabrous or pubescent, the connective not developed, the anthers with 2 functional thecae, the thecae strongly divergent or parallel; ovary 4-lobed, the gynobase unlobed or forming a nectarium, the style bifid near the tip, the branches equal and acute. Nutlets ca 4, attached at the base, ? obovate.
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Habit
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Herbs
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Distribution
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Up to 200 species in the North Temperate Zone and extending to South America and South Africa.
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Reference
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Epling, C. C. Preliminary revision of American Stachys. Repert. Spec. Nov. Beih. 80: 1-75, 1934.
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