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7a. Phoradendron villosum (Nuttall) Nuttall ex Engelmann subsp. villosum

Phoradendron villosum var. rotundifolium Trelease

Hairs on young stems, leaf blades, and inflorescences of one type, uniformly distributed and of similar lengths. Staminate inflorescences: internodes each (15–)29(–45)-flowered. Pistillate inflorescences: internodes each (7–)12(–24)-flowered. 2n = 28.

Flowering Jul–Sep. Oak woodlands; 20–2200 m; Calif., Oreg.; Mexico (Baja California).

Subspecies villosum is parasitic mainly on oaks, including Quercus agrifolia, Q. douglasii, and Q. lobata (V. E. Thompson and B. E. Mahall 1983), but can be found on Aesculus, Arctostaphylos, Betula, Populus, Robinia, and Salix. The subspecies is distributed from the Coast Ranges and Willamette Valley of Oregon south through the Sierra Nevada and Coast and Transverse ranges of California into northern Baja California.


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