From the Greek α-, not, mitos, a thread, and stigma, a stigma, a substitution for Blume's Mitostigma, a later homonym that had been used earlier by J. Decaisne for a genus of the Asclepiadaceae. (JW). (Pridgeon et al. 2002).
Perennial herbs . Tubers small, ellipsoid. Stem with two cataphylls. Leaves solitary, oblong or narrowly elliptic, acute, unspotted. Inflorescence one- to few-flowered, erect, terminal; peduncle naked or with a sheathing sterile bract; rachis short; floral bracts mostly shorter than or equalling ovary. Flowers resupinate, white, pink, mauve, purple, or rarely yellow, labellum often with deeper purple markings. Sepals and petals free, often connivent, obtuse. Labellum spurred, variously three-lobed, somewhat cuneate at base, mid-lobe often bilobed, spreading, often with spots or lines on disc, spur cylindrical to narrowly conical, short, or elongate (e.g. A. pinguicula). Column short; stigma solitary, narrow, sessile, positioned under the anther, with strongly diverging, filiform lateral stigmatic lobes adnate to the lower margins of the labellum; staminodes clear and elongate; rostellum small, low; anther sessile, horizontal, loculi parallel; pollinaria short, pollinia two, subsessile, with minute caudicles sitting directly on naked viscidia; viscidia positioned in roof above spur entrance; bursicles absent; pollen falling loosely in tetrads. Ovary sessile or shordy pedicellate. Capsule cylindrical. (JW).