Talk about the class of sphenopsida

AKA equisetum or Horsetail. Aerial stems grow from the rhizomes bearing roots, aerial stems have nodes, internodes and ribs. Some species have fertile and sterile stems rising from the rhizome. The chlorophyll vegetative stem (non reproducing) bear small non photosynthetic leaves, microphylls, arranged in whorls on the nodes. In some species, lateral branches are inserted at the nodes. Fertile stems are not photosynthetic and have at their end sporangia grouped in strobili. Horsetail is isosporic, bisexual gametophytes are green and independent of sporophyte)