Sphenophyllum is a genus in the order Sphenophyllales. [2] It has been placed in the family Sphenophyllaceae. [1]

Sphenophyllum, genus of extinct plants that lived from the end of the Devonian Period to the beginning of the Triassic Period (about 360 to 251 million years ago); it is most commonly reconstructed as a shrub or a creeping vine.

Sphenophyllales is an extinct order of articulate land plants and a sister group to the present-day Equisetales (horsetails). They are fossils dating from the Devonian to the Triassic. They were common during the Late Pennsylvanian to Early Permian, with most of the fossils coming from the Carboniferous period. [1][2]

Sphenophyllum is the name (= form-genus) for compression/impression remains of leaves of an enigmatic sphenophyte. Sphenophyllum historically has been allied with horsetails by their similar morphology (leaves in circlets, called whorls, positioned at nodes along the stem) but this relationship is hardly definite.

Sphenophyllales represent a small and compact group of sphenopsida. They have left no surviving representatives. The geological history of Sphenophyllales dates back to a time earlier than carboniferous period. Some of the genera like Sphenophyllum appeared during Devonian reaching maximum development during carboniferous period.

The Sphenophyllophytes are an extinct group of spore-bearing, vascular plants, deriving their name from the wedge-shaped appearance of their leaves (spheno-phyll). They are a controversial group with loose connections to horsetails or ferns, or maybe lycophytes.

Sep 1, 2022 · Sphenophyllum Brongniart constitutes a common and important element in the Carboniferous and Permian floras around the world, but its records in the Devonian Period are limited and remain to be investigated with respect to their morphology, anatomy, and distribution.

New species Sphenophylum archangelskyii, S. churuliamum, S. waltoniamum and Trizygia maithyiana are proposed. A new mode of attachment of leaf to the axis is discovered for Gondwanophyton. INTRODUCTION .

May 5, 2017 · Sphenophyllum was an important and long-surviving sphenopsid genus in the Paleozoic floras, with a worldwide distribution. A new species, Sphenophyllum changxingense sp. nov., is described from the Upper Devonian Wutong Formation of Changxing County, Zhejiang Province, China.

However, many fossils of herbaceous horstetails are also found, of which the genus Sphenophyllum is the most common one. The leaflets of these plants are often wedge-shaped, which explains the name: sphen = wedge and phyllon = leaf.