Stachys arvensis
Acker woundwort on São Jorge
The field - Betony ( Stachys arvensis) is a perennial plant of the genus Zieste ( Stachys ) in the mint family ( Lamiaceae).
Description
Vegetative characteristics
The field woundwort grows as an annual, herbaceous plant, reaching heights of growth of mostly 30 to 40 (10 to 50) cm. The slender stem is prostrate, rarely erect, branched sparrig rich purple and often overcrowded and sparsely hairy fluffy. The internodes are 1-8 cm long.
The lower leaves are stalked 0.5 to 2 cm long and the upper sitting. usually entire, and as long or nearly as long as the flowers. The simple leaf blade is broadly ovate to broadly elliptic with sweetheart Spreitenbasis, blunt-ended and blunt notched leaf edge with a length of 1 to 3 cm and a width of 0.8 to 3 cm. The network annoying leaf blade and upper side covered with dense hair fluffy and hairy undersides sparse fluffy.
Generative features
The total inflorescence comprises about six to twelve widely spaced Scheinquirle each with four to six flowers. In this area the seated leaves are shorter than the sepals wedge base and more or less smooth edge. The cover sheets are about 1 mm long. The short flower stalks are about 1 mm long.
The hermaphrodite, zygomorphic, five petals are 6-9 mm long with a double perianth. Five about 3 mm long sepals are fused glockig. The densely hairy projecting and especially violet on top of crowded, ten annoying cup is the heyday of 6 to 7 mm long and fruit time 7 to 8 mm long and urn -shaped. He is. The nearly equal calyx teeth are about as long as the calyx tube and the heyday lanceolate, but at the time the fruit is almost as wide as long with a pointed end. The double lip corolla is shorter or scarcely longer than the calyx with a length of 6 to 8 mm. The five white, pale pink or red petals are fused. The straight corolla tube is internally provided with a hair ring. The straight upper lip is hairy and ovate outside fluffy with a length of 1.5 to 2.5 mm. The 2 to 3 mm long spreading lower lip is also just pre-stretched and outside hairy fluffy, three-lobed with rounded or notched middle lobe and small, egg-shaped side flaps. The anthers are purple, they are below the upper lip.
The Klaus fruit decays into four fruits, these Klausen are about 1.5 mm long, ovate, finely warty rough and blackish-brown color.
The field - Betony flowers primarily in the months from June to November.
The chromosome number is 2n = 10 or 18
Occurrence
The main focus of proliferation of arable woundwort is the Atlantic Europe. Eastward, it occurs to Sweden and Poland, Fujian, Guangdong, Guangxi and Taiwan and Russia; in the Mediterranean area it is rare, but it comes on the Azores, the Canaries, Madeira and North Africa prior to Greece and Crete. In addition, he may also abducted. Its occurrence in the Atlantic North America to Brazil are likely subsequent naturalization.
The field woundwort grows on sandy soils deficient in lime or clay soils in winter mild climate situation on wet fields or in gardens. He avoids limestone soils. He is a Kennart of Setario - Stachyetum arvensis, a weed society. As a result of intensification of agriculture but he is become rare.
System
This species was first published by Linnaeus under the name Glecoma arvensis; in the second edition of his work Species Plantarum in 1763 he placed this species in the genus Stachys.