Arceuthobium gillii

Hawksworth & Wiens

Brittonia 16: 55, figs. 1A, 2A. 1964

Common names: Chihuahua pine dwarf mistletoe
Treatment appears in FNA Volume 12. Treatment on page 427. Mentioned on page 425.
Plants forming nonsystemic witches' brooms; staminate and pistillate plants dimorphic: staminate taller with open divaricate branching, pistillate shorter with dense branching. Stems olive green, greenish brown, greenish yellow, or orange; secondary branching fanlike, branches 8–15(–25) cm, third internode 5–18 × 2–4.5 mm, dominant shoot 2.5–8 mm diam. at base. Staminate pedicels absent. Staminate flowers slightly asymmetric, (proximal petal deflexed at anthesis), lenticular in bud, 2.5–4 mm diam.; petals 3, same color as stem abaxially, tawny reddish brown adaxially. Berries proximally olive green and conspicuously glaucous with bluish hue, distally greenish or yellowish brown, 4–5 × 2–3 mm. Seeds pyriform to ellipsoid, 3–4 × 2–3 mm, endosperm dark olive green. 2n = 28.

Phenology: Flowering Feb–Apr; fruiting Oct.
Habitat: Coniferous and mixed forests with Chihuahua pine.
Elevation: 1700–2700 m.


V12 699-distribution-map.jpg

Ariz., N.Mex., Mexico (Chihuahua, Durango, Sinaloa, Sonora).


Meiosis occurs in September, with fruits maturing 19 to 20 months after pollination; seeds germinate in April.

In the flora area, Arceuthobium gillii is found in the Chiricahua, Huachuca, Santa Catalina, and Santa Rita mountains of Arizona, and the Animas Mountains of New Mexico. Subspecies nigrum Hawksworth & Wiens, which occurs in the Sierra Madre Occidental and Oriental of Mexico, was subsequently elevated to species rank as A. nigrum (Hawksworth & Wiens) Hawksworth & Wiens. The two species are apparently allopatric but occur in the same mountain range in northern Durango, Mexico. Both form nonsystemic witches’ brooms on members of Pinus subsect. Leiophylla Loudon and are closely related as shown by molecular analyses (D. L. Nickrent et al. 2004).

Selected References


Lower Taxa


Facts about "Arceuthobium gillii"
AuthorDaniel L. Nickrent +
AuthorityHawksworth & Wiens +
Common nameChihuahua pine dwarf mistletoe +
DistributionAriz. +, N.Mex. +, Mexico (Chihuahua +, Durango +, Sinaloa + and Sonora). +
Elevation1700–2700 m. +
HabitatConiferous and mixed forests with Chihuahua pine. +
Illustration copyrightFlora of North America Association +
IllustratorYevonn Wilson-Ramsey +
PhenologyFlowering Feb–Apr + and fruiting Oct. +
Publication titleBrittonia +
Publication year1964 +
ReferenceNone +
Source xml grained fna xml/V12/V12 699.xml +
Taxon familyViscaceae +
Taxon nameArceuthobium gillii +
Taxon parentArceuthobium +
Taxon rankspecies +
VolumeVolume 12 +