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Published In: Species Plantarum 2: 580. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
Contributor Text: I.C. Hedge
General/Distribution: A large almost cosmopolitan genus of about 250 species, richly developed in Europe and SW Asia.
Comment/Acknowledgements: Species not yet recorded from Pakistan

Stachys arvensis L., a native of Europe and SW Asia, is now a widespread introduced plant of weedy places in many parts of the world. It is a small annual with pinkish flowers about 6 mm long.


 

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Perennial herbs (in ours), herbaceous or suffruticose, with simple or stellate-dendroid hairs. Leaves undivided, margins entire to serrate or lobed, ovate cordate to narrow elliptic, petiolate or sessile. Verticillasters 2-20-flowered in axils of upper leaves. Bracts present, herbaceous or spiny. Flowers white to pink to purple, sometimes cleistogamous. Calyx tubular to campanulate, scarcely bilabiate or regular, 5-10-nerved; teeth 5, subequal; tube internally pilose or bearded at throat. Corolla longer than calyx, bilabiate; upper lip ± straight; tube annulate or not, exserted from calyx or not. Stamens 4, didynamous, anterior pair longer than posterior, included under upper lip of corolla or included within corolla tube; thecae bilocular, spreading, glabrous, or bearded Style with two subequal short lobes. Nutlets trigonous or scarcely so, apically obtuse or truncate.
 

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1 Plants with simple hairs only; corolla more than 10 mm long (2)
+ All parts of the plant with a dense stel-late - dendroid indumentum; corolla c. 6 mm long 6 Stachys parviflora
2 (1) Verticillasters 6 - many - flowered; bracts herbaceous; leaves without lobes (3)
+ Verticillasters 2 (-6) - flowered; bracts spiny, some leaves usually lobed 5 Stachys tibetica
3 (2) Upper lip of corolla with short hairs [plants of damp places or wet ground] (4)
+ Upper lip of corolla with long soft hairs [plants of dry ground] (5)
4 (3) All leaves petiolate, broadly ovate 3 Stachys sylvatica
+ Only lowermost leaves shortly petiolate, others sessile, oblong to oblong-lanceolate 4 Stachys palustris
5 (3) Leaf under surface and at least young stems white-lanate; corolla 10-12 mm long 1 Stachys floccosa
+ Leaf under surface and young stems not white-lanate; corolla 10-17 mm long 2 Stachys emodi
 
 
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