n.any tropical gymnosperm of the order Cycadales; having unbranched stems with a crown of fernlike leaves

Cycads
world list of cycads
The Biology of the Cycads
Cycads: their evolution, toxins, herbivores and insect pollinators.
Cycads: evolutionary innovations and the role of plant-derived neurotoxins.
A phylogeny of cycads (Cycadales) inferred from chloroplast matK gene, trnK intron, and nuclear rDNA ITS region
Root-based N2-fixing symbioses: Legumes, actinorhizal plants, Parasponia sp. and cycads
Root-based N 2 -fixing symbioses: Legumes, actinorhizal plants, Parasponia sp. and cycads
DNA Barcoding in the Cycadales: Testing the Potential of Proposed Barcoding Markers for Species Identification of Cycads
Testing co-evolutionary hypotheses over geological timescales: interactions between Mesozoic non-avian dinosaurs and cycads.