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Vaginata Hawksworth & Wiens because all North American Arceuthobium reside there. This classification differs most from F. G. Hawksworth and D. Wiens (1972)

campylopodum subspeciesArceuthobium campylopodum subsp. littorum (Hawksworth, Wiens & Nickrent) Nickrent Phytoneuron 2012-51: 10. 2012. Daniel L. Nickrent

campylopodum subspeciesArceuthobium campylopodum subsp. californicum (Hawksworth & Wiens) Nickrent Phytoneuron 2012-51: 10. 2012. Daniel L. Nickrent Common

campylopodum subspeciesArceuthobium campylopodum subsp. monticola (Hawksworth, Wiens & Nickrent) Nickrent Phytoneuron 2012-51: 10. 2012. Daniel L. Nickrent

campylopodum subspeciesArceuthobium campylopodum subsp. apachecum (Hawksworth & Wiens) Nickrent Phytoneuron 2012-51: 10. 2012. Daniel L. Nickrent Common

campylopodum subspeciesArceuthobium campylopodum subsp. siskiyouense (Hawksworth, Wiens & Nickrent) Nickrent Phytoneuron 2012-51: 10. 2012. Daniel L. Nickrent

was subsequently elevated to species rank as A. nigrum (Hawksworth & Wiens) Hawksworth & Wiens. The two species are apparently allopatric but occur in

Geogr. Surv., Wheeler, 253. 1879 Synonyms: A. microcarpum (Engelmann) Hawksworth & Wiens Treatment appears in FNA Volume 12. Treatment on page 432. Mentioned

vaginatum subspeciesArceuthobium vaginatum subsp. cryptopodum (Engelmann) Hawksworth & Wiens Brittonia 17: 230. 1965. Daniel L. Nickrent Common names: Southwestern

speciales concoloris Hawksworth & Wiens, which parasitizes Abies concolor (white fir), and forma speciales magnificae Hawksworth & Wiens, which parasitizes

Campylopoda (F. G. Hawksworth and D. Wiens 1972) as was another parasite of pinyons from Mexico, A. pendens (Hawksworth and Wiens 1980). Isozyme data

growth and may eventually result in host mortality. Section Minuta Hawksworth & Wiens was erected to accommodate the two diminutive North American dwarf

estimated as 130 million cubic meters (D. B. Drummond 1982; F. G. Hawksworth and D. Wiens 1996). Although these losses are severe, particularly in areas managed

campylopodum that usually corresponded with principal host species. F. G. Hawksworth and D. Wiens (1972, 1996) elevated those forms to species, stating that morphologic

range among all subspecies of Arceuthobium campylopodum. F. G. Hawksworth and D. Wiens (1996) considered subsp. tsugense to be a distinct species with

considered a major pathogen of these commercially important trees (F. G. Hawksworth and D. Wiens 1996). Secondary to rare hosts include P. attenuata, P. contorta

Notes Roy. Bot. Gard. Edinburgh 44: 275--310. Bailey, D. K. and F. G. Hawksworth. 1979. Pinyons of the Chihuahuan Desert region. Phytologia 44: 129--133