Frank Goode Hawksworth

Pinus remota, commonly known as the Texas pinyon or papershell pinyon, is a pine in the pinyon pine group, native to southwestern Texas and northeastern Mexico. It can be distinguished from other pinyon species by its thin-walled seeds, which made it especially attractive as a food to Indians and Mexicans living where it grew. Spanish explorer Cabeza de Vaca noted that the papershell pinon was an important food for the Indians in 1536.

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Arceuthobium gillii, common name "Chihuahua pine dwarf mistletoe," is a parasitic plant found in Arizona, New Mexico, Chihuahua, Sonora and Sinaloa. It is found mostly on the Chihuahua pine, Pinus leiophylla var. chihuahuana. The species was named in honor of Lake Shore Gill, an authority on the genus.

Arceuthobium azoricum (Portuguese: espigos-de-cedro) is a species of dwarf mistletoe endemic to the Azores. The population is restricted to the Grupo Central (central group) of the archipelago on Faial, Pico, São Jorge and Terceira islands. It is a parasitic plant of the local Juniperus brevifolia.

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Arceuthobium siskiyouense is a species of dwarf mistletoe commonly known as knobcone pine dwarf mistletoe and as Arceuthobium campylopodum subsp. siskiyouense. It is endemic to the Klamath Mountains of northern California and southern Oregon, where it parasitizes a number of species of hard pines in the subgenus Pinus. Its ecological impact on the coniferous forests where it is found is significant, both because of its negative impact on the health of infected trees and because it provides food and microhabitats (by inducing witch's brooms) for other wildlife.

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Arceuthobium monticola is a species of dwarf mistletoe known as western white pine dwarf mistletoe. It is a small shrub that grows on and parasitizes a small number of conifer species, primarily western white pines (Pinus monticola). It is endemic to the Klamath Mountains of northern California and southern Oregon, which has been identified as a major center of dwarf mistletoe biodiversity. This species impacts the ecology of coniferous forests significantly, negatively affecting the health of host trees but also creating valuable microhabitats for wildlife by inducing witch's brooms.

Arceuthobium littorum is a species of dwarf mistletoe known as coastal dwarf mistletoe. It is a endemic to the coastline of northern California, where it lives as a parasite on Bishop pine and Monterey pine trees, and occasionally on Bolander's pine. This species significantly impacts the ecology of coastal pine forests, negatively affecting the health of host trees but providing important habitat and food for other organisms.

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Arceuthobium apachecum, commonly known as Apache dwarf mistletoe and as Arceuthobium campylopodum subsp. apachecum, is a species of dwarf mistletoe. It is a parasitic plant that grows as a shrub on the branches and trunks of Southwestern white pine (Pinus strobiformis, sometimes treated as Pinus reflexa) trees in Arizona, New Mexico and Coahuila. In turn, it is often parasitized by species of fungi. Like with many dwarf mistletoe species, populations of A. apachecum impact the ecology of their environments significantly, degrading the health of host trees but providing food and creating

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Arceuthobium microcarpum is a species of flowering plant in the family Santalaceae endemic to the coniferous forests of Arizona and New Mexico. As with other species of dwarf mistletoe, A. microcarpum parasitizes several species of conifers, relying on the host plant for water and nutrients. There are two subspecies: A. microcarpum subsp. microcarpum, commonly known as western spruce dwarf mistletoe, which parasitizes spruce trees, and A. microcarpum subsp. aristatae, commonly known as bristlecone pine dwarf mistletoe, which parasitizes bristlecone pine trees. Because of its extremely limited

Arceuthobium californicum is a species of dwarf mistletoe commonly known as sugar pine dwarf mistletoe. It is a small shrub endemic to California that parasitizes the sugar pine (Pinus lambertiana). Although detrimental to the health of its host, it is ecologically important as a food source for wildlife and because the witch's brooms that it sometimes induces on host trees provide valuable habitat for birds and small rodents.

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