Furrows straight or obscure, not branched (Ephedra torreyana type). In polar view, ridges high and triangular, narrowing to a sharp crest.

Ephedra antisyphilitica Berland., Ephedraceae
CN: Jointfir or Mormon Tea
SIZE: Polar axis 59 µm equatorial diameter 43 µm
RANGE: Arid regions of western Texas to southern Colorado.
NOTES: Pollen of this species is among the largest of the Ephedra torreyana type. The ridges are highly undulate to nearly straight. In southwestern North America its pollen will be most frequently confused with that of E. california and E. pedunculata.

Ephedra antisyphilitica Berland. Coll. Texas; Ephedraceae.