Knowlton Hophornbeam growing on a sunny canyon rim in the Grand Canyon, one of its classic habitats. Photo: Rosie Yacoub, iNaturalist/Wikimedia Commons (CC BY 4.0)
Quercus graciliformis, known as the Chisos Oak or Slender Oak, is one of the rarest trees native to the United States. It exists nowhere in
Blolly growing as a slender understory tree among other hammock species. Photo: Daderot, Wikimedia Commons (CC0) Guapira discolor, commonly called Blolly (also known as Beeftree,
Mature Apache Pine forming an open forest stand in the Huachuca Mountains, Arizona. Photo: smalltownguy22, Wikimedia Commons (CC BY 2.0) Pinus engelmannii, commonly called Apache
Crataegus tracyi, commonly known as Tracy Hawthorn or Tracy’s Hawthorn, is a thorny native shrub or small tree found only in a few rugged corners
A wind-sculpted seaside juniper above the water, Burrows Pass, Washington — classic habitat for this Puget Sound endemic. Photo: Walter Siegmund, via Wikimedia Commons (CC
A dense colony of sandhill oak forming the characteristic low thicket cover of Florida scrub. Photo: Stephanie C, via Wikimedia Commons (CC0) Quercus inopina, known
A pressed herbarium specimen collected along the Wacissa River, Florida, showing the alternate, glaucous-backed leaves typical of this rare willow. Photo: The New York Botanical
Boynton oak foliage, showing the shallowly lobed leaves typical of the white oak group. Photo: Bruce Kirchoff, via Wikimedia Commons (CC BY 2.0) Quercus boyntonii,
Toughleaf Dogwood’s hairy, pyramidal flower cluster just before bloom. Photo: Alex Abair via Wikimedia Commons / iNaturalist (CC BY 4.0) Cornus asperifolia, commonly called Toughleaf
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