|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|W. L. Crepet and C. P. Daghlian 1980||Staminate catkins up to at least 90 mm in length having helically arranged, bract subtended, dichasia of three florests each. Florets have minute floral envelopes (0.8 mm x 1.0 mm) terminating in at least five ovate lobes. Floral envelope cuticle with rectangular epidermal cells, sometimes in rows, and with round trichome bases. Trichomes short hairs attached singly or in fascicles of at least two. Florets with up to ten stamens; anthers elliptical and small (length 0.24 mm). Pollen tricolporate; 15.6 micrometers x 9 micrometers; exine ornamentation striate.|