Definition that contains open cluster
- tanacetum douglasii lightly hairy rhizomatous perennial having aromatic feathery leaves and stems bearing open clusters of small buttonlike yellow flowers; sand dunes of Pacific coast of North America
- geranium viscosissimum geranium of western North America having pinkish-purple flowers in open clusters
- penstemon barbatus plant of southwestern United States having long open clusters of scarlet flowers with yellow hairs on lower lip
- golden-beard penstemon plant of southwestern United States having long open clusters of scarlet flowers with yellow hairs on lower lip
- penstemon linarioides plant having small narrow leaves and blue-violet flowers in long open clusters; Utah and Colorado to New Mexico and Arizona
- amber lily plant having basal grasslike leaves and a narrow open cluster of starlike yellowish-orange flowers atop a leafless stalk; southwestern United States; only species of Anthericum growing in North America
- narrow-leaf penstemon plant having small narrow leaves and blue-violet flowers in long open clusters; Utah and Colorado to New Mexico and Arizona
- sticky geranium geranium of western North America having pinkish-purple flowers in open clusters
- anthericum torreyi plant having basal grasslike leaves and a narrow open cluster of starlike yellowish-orange flowers atop a leafless stalk; southwestern United States; only species of Anthericum growing in North America
- northern dune tansy lightly hairy rhizomatous perennial having aromatic feathery leaves and stems bearing open clusters of small buttonlike yellow flowers; sand dunes of Pacific coast of North America