| − | Hartwigia purpurea, Lindl. Lvs. solitary, leathery, ovate-lanceolate, equally terete with the St., many times shorter than the thread-like peduncle: fls. small, purple; sepals acute, a little larger than the petals; limb of the lip white at the base, callous. Mex.
| + | Hartwegia purpurea, Lindl. Lvs. solitary, leathery, ovate-lanceolate, equally terete with the St., many times shorter than the thread-like peduncle: fls. small, purple; sepals acute, a little larger than the petals; limb of the lip white at the base, callous. Mex. |