helicteres isora
- n East Indian shrub often cultivated for its hairy leaves and orange-red flowers
helenium
- n genus of American herbs with flowers having yellow rays: sneezeweeds
helenium autumnale
- n North American perennial with bright yellow late summer flowers
helenium hoopesii
- n stout perennial herb of western United States having flower heads with drooping orange-yellow rays; causes spewing sickness in sheep
helenium puberulum
- n a sneezeweed of southwestern United States especially southern California
heliamphora
- n genus of pitcher plants of the Guiana Highlands in South America
helianthemum
- n any plant of the genus Helianthemum; vigorous plants of stony alpine meadows and dry scrub regions
helianthemum canadense
- n perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts
helianthemum scoparium
- n woody yellow-flowered perennial of southeastern United States
helianthus
- n any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays
helianthus angustifolius
- n sunflower of eastern North America having narrow leaves and found in bogs