| General Description | Pinus monophylla or Single-Leaf Pinyon is a slow growing, rounded to flat topped tree with a short trunk, dark brown branches and grey-green to greenish-blue needles. Mature trees are typically short and can be multi-stemmed. |
| ID Characteristic | Needles are 1 -2 in a cluster, rigid, curved inwards and grey-green. |
| Shape | Starts out pyramidal; more mature trees are rounded to flat-topped. |
| Cultivation | Grows well in a hot and dry location, in light, well-drained, sandy or gravelly loam. Long lived and drought tolerant. |
| Pests | Susceptible to needle scale, weakening the tree and making it vulnerable to bark beetles. |
| Habitat | Woodlands. |
| Bark/Stem Description | Irregularly furrowed and scaly, light or dark brown with red or orange coloured scales. |
| Flower/Leaf Bud Description | Brown, egg-shaped with scales. |
| Leaf Description | Usually single, stout, 4 - 6 cm long, grey-green to strongly glaucous blue-green, with stomata over the whole needle surface. |
| Flower Description | Yellow. |
| Fruit Description | Cones are acute-globose, the largest of the true pinyons, 4.5 - 8 cm long and broad when closed, green when young and ripening to yellow-buff, with a small number of very thick scales, typically 8 - 20 fertile scales. |
| Colour Description | Needles become a greenish-blue colour in summer. |
