star grass

1. Any of various plants of the genus Hypoxis, having grasslike leaves and star-shaped, white or yellow flowers.
2. See colicroot (sense 1).

The noun has 4 meanings:

Meaning #1: any of several perennials of the genus Aletris having grasslike leaves and bitter roots reputed to cure colic
  Synonyms: colicroot, colic root, crow corn, unicorn root

Meaning #2: any plant of the genus Hypoxis having long grasslike leaves and yellow star-shaped flowers: Africa; Australia; southern Asia; North America

Meaning #3: trailing grass native to Europe now cosmopolitan in warm regions; used for lawns and pastures especially in southern United States and India
  Synonyms: Bermuda grass, devil grass, Bahama grass, kweek, doob, scutch grass, Cynodon dactylon

Meaning #4: perennial Australian grass having numerous long spikes arranged like the vanes of a windmill
  Synonyms: windmill grass, creeping windmill grass, Chloris truncata