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FNA | Family List | FNA Vol. 12 | Viscaceae

7b. Phoradendron villosum (Nuttall) Nuttall ex Engelmann subsp. coryae (Trelease) Wiens, Brittonia. 16: 45. 1964.

Phoradendron coryae Trelease, Phoradendron, 43, plate 44. 1916; P. villosum var. coryae (Trelease) B. L. Turner

Hairs on young stems, leaf blades, and inflorescences of two types, some in dense clusters, relatively longer, others uniformly distributed, relatively shorter. Staminate inflorescences: internodes each (14–)25(–44)-flowered. Pistillate inflorescences: internodes each (6–)8(–12)-flowered.

Flowering Jul–Sep. Oak woodlands; 400–2400 m; Ariz., N.Mex., Tex.; Mexico (Chihuahua, Coahuila, Sonora).

In the flora area, subsp. coryae is found in Arizona south of the Mogollon Rim, through central New Mexico to the Chisos and Davis mountains of western Texas. Its principal hosts are Quercus species.

The molecular study by V. E. T. M. Ashworth (2000b) showed that Phoradendron villosum is paraphyletic because P. scaberrimum Trelease forms a clade with subsp. coryae. All three of these taxa parasitize Quercus and a shared indel supported their phylogenetic relationship.


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