Cycas petraea

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Figure 1. C. petraea


Common Names:

Loei Cycad

Distribution & Habitat:

It is found in the Loei mountains in the north of Thailand close to the border with Laos, known only from a single line of limestone mountains flanking the Phu Kra Dung massif to the east. It grows on steep limestone cliffs with no soil cover. The temperature can get below freezing in winter, with even occasional snowfall.


A strong grower, with stems to 6 m (20 ft) long. The leaves are short and flat with 32-40 dark green, very glossy, and slightly waxy leaflets on either side and are carried on a fairly long petiole.


Only described in 2002.


Sheltered, moist, and well drained. Cold tolerant.

Contributed by:

Scott MacLean (Figure 1&2)

External Links:

Cycad Pages, IUCN, JSTOR, Trebrown

Google, Google Images, Flickr, PACSOA Forums