Flora of North America species comparison

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Phoradendron bolleanum

Bollean mistletoe, fir mistletoe
Habit Subshrubs, erect, forming globose clumps to 10 dm diam., dioecious.
Stems

green, brown, reddish brown, or orange, glabrous or slightly puberulent, hairs simple;

internodes terete, to 2 cm.
Leaves

green, well developed, glabrous or slightly puberulent, hairs simple;

petiole very short or absent;

blade terete to narrowly oblong or oblanceolate, 7–35 × 1–10 mm, thin, base slightly tapered, apex acute-apiculate to rounded;

basal phyllotaxy transverse.
Flowers

petals 3–4, 1–2 mm.
Berries

white to pink, ovoid, 3.5–5 × 3.5–5 mm, glabrous.
Staminate

inflorescences 3–6 mm, glabrous or slightly puberulent, hairs simple;

peduncle with 1 internode, 1–2 mm;

fertile internode usually 1, 6–20-flowered, triseriate, flowers 1–3 per column or not in columns.
Pistillate

inflorescences 3–6 mm, elongating in fruit, glabrous or slightly puberulent, hairs simple;

peduncle with 1 internode, 1.5–3 mm;

fertile internodes 1(–2), each 2-flowered, flowers 1 per bract.
2n

= 28.

Phoradendron bolleanum
Phenology Flowering May–Aug.
Habitat Coniferous forests.
Elevation 300–3000 m. (1000–9800 ft.)
Distribution
from FNA
AZ; CA; NM; OR; TX; Mexico; Central America (Guatemala)
[WildflowerSearch map]
[BONAP county map]
Discussion

This treatment follows J. Kuijt (2003), who considered Phoradendron bolleanum to be a widespread and variable species complex. The three main taxa that often have been recognized as species are Phoradendron bolleanum in the narrow sense, P. densum, and P. pauciflorum,. Phoradendron bolleanum in the narrow sense has small, narrow leaves and frequently parasitizes Juniperus as well as Arbutus. The P. pauciflorum variant has broad leaves and mostly parasitizes Abies concolor. The P. densum variant tends to have leaves that are intermediate between those of the other two variants; it ranges from Oregon to Mexico and parasitizes Cupressus and Juniperus. Molecular analyses indicate that P. bolleanum is not monophyletic unless P. minutifolium Urban is synonymized with the other variants. Hybrids between P. bolleanum and P. juniperinum produce plants closely resembling P. minutifolium (D. Wiens and M. DeDecker 1972). As pointed out by Kuijt, molecular studies will be required to determine species boundaries within this complex.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 12, p. 436.
Parent taxa Viscaceae > Phoradendron
Sibling taxa
P. californicum, P. capitellatum, P. juniperinum, P. leucarpum, P. rubrum, P. villosum
Synonyms Viscum bolleanum, P. bolleanum subsp. densum, P. bolleanum var. densum, P. bolleanum subsp. pauciflorum, P. densum, P. hawksworthii, P. pauciflorum
Name authority (Seemann) Eichler: in C. F. P. von Martius et al., Fl. Bras. 5(2): 134m. (1868)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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