Paul Martin Brown in Flora of North America (vol. 26)
Herbs, perennial, terrestrial. Roots tuberous, fascicled, fleshy. Stems with foliaceous sheaths. Leaves usually absent at anthesis, basal or cauline, base cuneate. Inflorescences terminally flowered spikes. Flowers resupinate; perianth parts distinct and/or free; sepals similar, basally connivent, forming inflated nectary; lip free, oblong-ovate, arcuate, base conduplicate, apex acute; column partially adnate to dorsal sepal, not inflated adaxially at base; anther ovate-cucullate, margins entire; viscidium rounded; rostellum longer than wide; stigma 2-lobed at apex. Fruits capsules.
Species within checklist:
Flora of Federal Protected Areas, Desert West