|First Collector||P.G. Rowlands|
|Habitat||Petrified Forest Nat. Monument, Dead Wash|
Cross-section round. Outline smooth. Culm center hollow. Recognizable epidermis cells. Continuous peripheral sclerenchymatic belt. Large vascular bundles in one row. Small vascular bundles integrated in the sclerenchymatic belt. Solitary large vascular bu
Outline wavy. Upper epidermis cells in one row. Epidermis with papillae. Vascular bundles centered between the upper and lower side of the leaf. Girders extending from the vascular bundle to both sides of the leaf.