George Bishop Sudworth

Juniperus pinchotii, commonly known as Pinchot juniper or redberry juniper, is a species of juniper native to south-western North America, in Mexico: Nuevo León and Coahuila, and in the United States: south-eastern New Mexico, central Texas, and western Oklahoma. It grows at altitudes between 600 and 2,100 metres (2,000 and 6,900 feet).

Pinus quadrifolia, the Parry pinyon, is a pine in the pinyon pine group native to southernmost California in the United States and northern Baja California in Mexico, from 33° 30' N south to 30° 30' N. The Parry pinyon has a lifespan of around 200 to 500 years. It is usually found in rocky areas that often have thin soil. It occurs at moderate altitudes from 1,300 metres (4,300 ft) to 1,800 metres (5,900 ft), rarely as low as 1,200 metres (3,900 ft) and as high as 2,500 metres (8,200 ft). It is scarce and often scattered in this region, forming open woodlands, usually mixed with junipers.

Quercus gravesii (also called Chisos red oak or Grave's oak) is an uncommon North American species of oak in the red oak section Quercus section Lobatae. It is found in Mexico and the United States. It is a deciduous tree up to 13 metres (43 feet) tall. The leaves are hairless, each with 3–5 pointed and awned lobes. The bark is black. It is closely related to shumard oak and emory oak.

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Pinus × sondereggeri is the only named southern pine hybrid. Its common names include Sonderegger pine and bastard pine. It is a naturally occurring cross between loblolly pine (P. taeda) and longleaf pine (P. palustris). It was originally described by H. H. Chapman (1922), who named it after its discoverer, V. H. Sonderegger, a state forester of Louisiana. This pine usually occurs singly or in small groups where both loblolly and longleaf pines overlap in range. Because both parental trees usually produce cones at the same time of year, no phenological barrier exists, thus the two freely

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