Pretty woodland plants with narrow to lance-shaped green leaves and small, star-shaped flowers. Need light, well-drained soil; well suited to rock gardens. Plants spread into wide colonies over time, but they're not invasive; dig up offsets to obtain new plants.
H. decumbens. GIANT STAR GRASS. Zones US, MS, LS, CS, TS; USDA 6-11. Native to Mexico. Dense mound of light green, grassy leaves to 8 in. tall, sprawling at least twice as wide. Bright yellow, 1-in. flowers in spring, summer, and fall.
H. hirsuta. YELLOW STAR GRASS. Zones US, MS, LS, CS; USDA 6-9. Native from Maine to Florida and west to Texas. Usually found in dryish, open woodlands, growing in sandy or stony soil. Grassy, somewhat hairy, foot-long leaves rise from a short rhizome. In spring and early summer, a foot-tall stem carries one to seven bright yellow, starlike, inch-wide flowers. A second bloom may follow later.