Grand Canyon National Park Seeding Endangered Plant . Planting of sentry milk-vetch seeds at Maricopa Point on July 3, 2012 is the latest step in Grand Canyon National Park’s effort to recovery the park’s only species of endangered plant. Sentry milk-vetch (Astragalus cremnophylax var. cremnophylax), grows only in three locations on the South Rim. The plant is at risk of extinction because it requires shallow soils within a few feet of the canyo

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