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.

Distribution

V12 699-distribution-map.jpg

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

Discussion

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

None.

Lower Taxa

None.
... more about "Arceuthobium gillii"
Daniel L. Nickrent +
Hawksworth & Wiens +
yellowish-brown +, greenish +  and olive green +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (?) +  and 0.3 cm3 mm <br />0.003 m <br /> (?) +
scale-like +
15 cm150 mm <br />0.15 m <br /> (25 cm250 mm <br />0.25 m <br />) +
8 cm80 mm <br />0.08 m <br /> (?) +  and 15 cm150 mm <br />0.15 m <br /> (?) +
Chihuahua pine dwarf mistletoe +
spikelike +
Ariz. +, N.Mex. +, Mexico (Chihuahua) +, Mexico (Durango) +, Mexico (Sinaloa) +  and Mexico (Sonora) +
1700–2700 m. +
green +  and dark olive +
globose +  and pyriform +
0.25 cm2.5 mm <br />0.0025 m <br /> (?) +  and 0.4 cm4 mm <br />0.004 m <br /> (?) +
lenticular +
Coniferous and mixed forests with Chihuahua pine. +
terminal +  and axillary +
bisexual +  and unisexual +
0.2 cm2 mm <br />0.002 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
connate +
scale-like +
pinnate +  and entire +
articulated +
asymmetric +  and symmetric +
tawny reddish-brown +
connate +  and distinct +
deltate +  and triangular +
Flowering Feb–Apr +  and fruiting Oct. +
2[-3]-carpellate +
mucilaginous +
0.3 cm3 mm <br />0.003 m <br /> (?) +  and 0.4 cm4 mm <br />0.004 m <br /> (?) +
pyriform +  and ellipsoid +
0.2 cm2 mm <br />0.002 m <br /> (?) +  and 0.3 cm3 mm <br />0.003 m <br /> (?) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
3 +  and 4 +
orange;greenish yellow;orange;greenish yellow;greenish brown;olive green +
pendulous +  and erect +
fanlike +
undifferentiated +
Arceuthobium gillii +
Arceuthobium +
species +
spikelike +
mucilaginous +
branching +  and staminate +
pistillate +  and staminate +
evergreen +  and perennial +
plant +  and dimorphic +