familyViscaceae
genusArceuthobium
speciesArceuthobium campylopodum
subspeciesArceuthobium campylopodum subsp. laricis
Arceuthobium campylopodum subsp. laricis
Phytoneuron 2012-51: 9. 2012.
Common names: Larch dwarf mistletoe
Endemic
Basionym: Arceuthobium douglasii var. laricis M. E. Jones Biol. Ser. Bull. State Univ. Montana. 15: 25. 1910
Synonyms: A. laricis (M. E. Jones) H. St. John Razoumofskya laricis (M. E. Jones) Piper
Revision as of 21:07, 27 May 2020 by imported>Volume Importer
Plants forming witches' brooms. Stems green, olive green, maroon, or purple, 4(–6) cm; third internode 5–8(–14) × 1–1.3(–2.5) mm, dominant shoot 1.5–3 mm diam. at base. Staminate flowers 2.7 mm diam.; petals 3(–4). Fruits 3.5 × 2.5 mm.
Phenology: Flowering Jul–Aug; fruiting (Aug–)Sep(–Oct).
Habitat: Coniferous forests, especially with western larch or mountain hemlock.
Elevation: 600–2300 m.
Distribution
![V12 156-distribution-map.jpg](/w/images/d/d7/V12_156-distribution-map.jpg)
B.C., Idaho, Mont., Oreg., Wash.
Discussion
Meiosis occurs in June, with fruits maturing 13–14 months after pollination.
Larix occidentalis and Tsuga mertensiana are the principal hosts for subsp. laricis; secondary to rare hosts include Abies grandis, A. lasiocarpa, Picea engelmannii, Pinus albicaulis, P. contorta, P. monticola, and P. ponderosa. This dwarf mistletoe is a major pathogen on larch in Idaho and Montana.
Selected References
None.
Lower Taxa
None.