Plants 0.3-1.5 dm; corms 1.2-2 cm in diam. Leaves 1 (rarely 2), 7-18 × 0.07-0.1 cm. Scape 3-5 cm. Flowers 2-5(-10); tepals whitish or rarely bluish, with green abaxial midvein, broadly lanceolate; perianth tube 0.3-0.5 mm, lobes 3-6 × 1.5-2.5 mm; stamens 2-4 mm; filaments erect, conspicuously dilated entire length, distinct but with broad overlapping margins forming cylindrical nectariferous tube with apical crown; anthers yellow, 0.6-0.9 mm; pedicel 0.5-3 cm. Capsules 3-7 mm. Seeds 2-3 mm. 2n = 14.

Flowering spring (Mar--Jun). Desert scrub; 1000--1600 m; Calif., Nev.

Muilla coronata is found in deserts of southern California and southwestern Nevada. The scape is very short compared to that of other Muilla species. The erect, dilated filaments form a cylindrical crown similar to that found in some species of Triteleia and Androstephium.