9. Pinus ponderosa var. scopularum, Ponderosa Pine. At our elevation of approximately 7500 feet, there are a few Ponderosa's scattered among the Pinyon and Juniper trees. In our mountains, we are at the ecotone, or transition zone, between the Pinyon-Juniper Woodland and Ponderosa Pine Forest. At the top of the ridge behind our house, Pondersa Pines are the dominant trees.
10. Juniperus scopulorum, Rocky Mountain Juniper. In this stand of Juniper, the Rocky Mountain Juniper spiecies is the one that is bluish in color. RM Juniper also has a weepy growth habit, and these are ways to tell it apart from...
11. Juniperus monosperma, One-seed Juniper. This is the green Juniper shrubs behind the Rocky Mountain Juniper. One-seed Juniper has a stiffer habit.
These two are different species and not merely varieties of Juniper, and are therefore legitimately counted separately. However, plants just don't obey the species definition rules very well at all! They are far more profligate than are animals.
12. Linum usitatissimum, Common Flax. Flax plants are considered to be the plants upon which civilization was built. Linum ssp. are found all over the world and have been used by human beings from prehistory to today.
13. Opuntia clavata, Devil Cholla or Club Cholla. There are actually 20 different species of Cholla (genus Opuntia) that grow in the Americas. Cacti are New World Plants, and plants that look like cacti but are native to the Old World are products of convergent evolution--they are not actually related to cacti. O. clavata is native to the Chihuahuan desert and surrounding mountains of central New Mexico.
It is the plant to the left in the picture. The Cholla is growing next to a young pine.