In polar view, ridges low, gently-rounded, or semi-circular; ridges straight, 11 to 17 in number Ephedra torreyana type

Ephedra trifurca
Tor., Ephedraceae
CN: Jointfir or Mormon Tea
SIZE: Polar axis 53 µm, equatorial diameter 29 µm
RANGE: Southwestern Texas to southern California and adjacent Mexico.
NOTES: This species may be distinguishable from other native species in that the ridges are more gently rounded (in cross section), about 2.8 µm to 5 µm wide, and average 13.7 in number.

Ephedra trifurca Torr. Coll. New Mexico; Ephedraceae.