Arceuthobium campylopodum subsp. siskiyouense

(Hawksworth

Wiens & Nickrent) Nickrent, Phytoneuron 2012-51: 10. 2012

Common names: Knobcone pine dwarf mistletoe
Endemic
Basionyms: Arceuthobium siskiyouense Hawksworth Wiens & Nickrent, Novon 2: 204. 1992
Treatment appears in FNA Volume 12. Treatment on page 433. Mentioned on page 429, 430.

Plants forming witches' brooms. Stems brown, 6–8(–10) cm; third internode 8–9(–15) × 2 mm, dominant shoot 2–2.5 mm diam. at base. Staminate flowers 3 mm diam.; petals 3 or 4. Fruits 4 × 2.5 mm.


Phenology: Flowering Aug–Sep; fruiting Sep–Oct.
Habitat: Coniferous forests, especially closed-cone pine forests with knobcone pine.
Elevation: 400–1200 m.

Discussion

Meiosis likely occurs in July, with fruits maturing 13 months after pollination.

The principal host of subsp. siskiyouense is Pinus attenuata; rare hosts include P. contorta, P. jeffreyi, and P. ponderosa. Subspecies siskiyouense is endemic to the Klamath and Siskiyou mountains.

Selected References

None.

Lower Taxa

None.

Daniel L. Nickrent +
(Hawksworth +
Arceuthobium siskiyouense +
Knobcone pine dwarf mistletoe +
Calif. +  and Oreg. +
400–1200 m. +
Coniferous forests, especially closed-cone pine forests with knobcone pine. +
Flowering Aug–Sep +  and fruiting Sep–Oct. +
Wiens & Nickrent) Nickrent, Phytoneuron +
Razoumofskya campylopoda +
Arceuthobium campylopodum subsp. siskiyouense +
Arceuthobium campylopodum +
subspecies +