Mary Ann Heacock
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Mary Ann Elizabeth Heacock (1915–2011), commonly known as Mary Ann Heacock, was an American avocational botanist who collected plants and inspired the work of many horticulturists[1] and plant societies.[2]
She was born on June 11, 1915 in Marthaville, Louisiana, and died on July 23, 2011 in Waurika, Oklahoma.[3]

Some of the plant species and cultivars Heacock had a special role in identifying or developing include:
- Pinus ponderosa 'Mary Ann Heacock',[4] a dwarf pine
- Opuntia debreczyi,[5][6] a prickly pear
- Penstemon grandiflorus 'P010S',[7] Prairie Jewel® penstemon