Freitag, 29. April 2011

Plant of the Day (April 29th, 2011) - Pinus jeffreyi Ball. ex. A. Murray.

Like yesterdays “Plant of the Day” (Picea breweriana S. Watson) Pinus jeffreyi Ball. ex. A. Murray. (Jeffrey Pine) belongs to the Pinaceae family and like P. breweriana I found this one at the Botanical garden of Solingen, Germany.

P. jeffreyi Ball. ex. A. Murray - habitus

The tree can reach heights between 40 and 60 metres (131,23 – 196,9 feet), so it's a very tall tree (the possible biggest individual of this species (56,7 metres), called “Smoky Jack”, can be found at the Yosemite National Park). The blue-green needles are very long with 23 cm (0,75 feet). They are sitting at the short shoot with always three needles per shoot. The needles are not piercing. The bark is red.

The ripe female cones of P. jeffreyi are very large (30 cm). They are cylindrical and brown-coloured. Young female cones are also cylindrical and red.

 P. jeffreyi Ball. ex. A. Murray - young femal cone

The species is endemic to eastern California, where it grows at the hangs of the Sierra Nevada.
P. jeffreyi can reach altitudes between 1500 and 2100 metres. It's a very endurable tree, tolerant towards frost and dryness but it doesn't like to wet places. It also have low claims toward the soil and can grow at sand or gravel.

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