Via spore.
Equisetum myriochaetum was created in 1908.
Equisetum giganteum was created in 1759.
Equisetum thermale was created in 2011.
Equisetum
Arthrophyta
Equisetum Arvense
equisetum
The genus name Equisetum is derived from the Latin words equus, meaning horse, and seta, meaning bristle.
Equisetum
Yes, horse tail (Equisetum arvense) does not contain ephedrine. Ephedrine is a compound found in plants of the Ephedra genus, not in Equisetum species.
Marion Alvin Johnson has written: 'Origin and development of tissues in the stem of Equisetum scirpoides' -- subject(s): Equisetum scirpoides, Plant cells and tissues
Reliable sources report that equisetum grows rhizomes to depths of six feet, although many anecdotal reports exist for depths of twice this depth or more. If your equisetum has appeared only recently, it will have a fairly shallow root depth, and glyphosate may be effective at the maximum label rate, particularly if applied repeatedly. Glyphosate will have little effect on established equisetum as the plants will have considerable "reserves" in the form of carbohydrates stored in tubers and rhizomes at a greater depth in the soil than a first-season occurrence of the plant. Repeated burning or cutting of horsetail forces its continued growth, eventually exhausting its carbohydrate stores. This process can take years for well-established equisetum stands. Equisetum thrives in wet, acidic, sunny locations. Therefore, applying lime, improving drainage, and applying fertilizer to accelerate the growth of grasses in mixed stands serves as a cultural control. Equisetum does not respond significantly to additional nitrogen, giving grasses an advantage.