Accumulated starch other than exclusively 'pteridophyte type'. Leaf anatomy . Lamina with secretory cavities. The mesophyll containing calcium oxalate crystals, or without calcium oxalate crystals. The mesophyll crystals if present, raphides.
Minor leaf veins without phloem transfer cells.
Stem anatomy . Secondary thickening absent. Xylem without vessels. Root anatomy . Reproductive type, pollination .