HABENARIA DILATATIFORMIS. (Platenthera gracilis Lindl. Gen. & Sp.
Orch. 2S8. 1835-9. Habenaria gracilis S. Wats. Proc. Am.
Acad. 12: 277. 1877. Not Hook. Exot. Fl. pl. 135. 1825.) In general habit this most resembles H. hyperborea, from which it differs in the larger white flowers, in the lip, which is broadened at the base as in H. dilatata, although less so, and in the spur which is thickened at the end. From H. dilatator it
differs in the less dilated lip and the shorter more saccate spur, which is slightly shorter than the lip.
Common in marshy places at an altitude of 5000-6000 feet. Spanish Basin by J. H. Flodman (nos. 36o and 361) ; also collected by P. A. Rydberg, in 1895, at Bozeman (no. 2607), and at Deer Lodge (no. 2608).