header

Sonoran Desert Help

Armament Definitions

  • Spines and Thorns
    • Spineless -
    • Thorns - Heavy, thick sharp-pointed branches as opposed to spines which are defined here as relatively small or thin modified leaves.
    • Curved spines - Usually short spines Less than 1/2 inch long.
    • Hooked spines - Spines sharply curved at the ends like a fishhook. These spines can be small and thin or large and heavy.
    • Short straight spines without sheaths - Spines about a half inch long or less. Not sheathed. Test by pulling on the spine with two fingers.
    • Short straight spines with sheaths - Spines about a half inch long or less. Test by pulling on the spine with two fingers.
    • Long straight spines without sheaths - Spines about an inch or more long. Not sheathed. Test by pulling on the spine with two fingers.
    • Long straight spines with sheaths - Spines about an inch or more long with sheaths. By grasping the spine with two fingers and pulling, the sheath will become evident as it comes off.
    • Spine tipped leaves - Heavy, stiff elongated leaves with extremely sharp spines at the ends.
    • Spiny leaves - Leaves of various shapes with spines around the margins.
    • Spiny involucres - Plants in the aster (composite, sunflower, daisy, etc.) family with spines at the tips of the bracts at the base of the flower heads.
    • Spiny around flowers - Spines at the base of flowers not in the aster family.
    • Spiny fruits - Plants bearing fruits with spines (often hooked) on the fruits.
    • Glochids only - Cacti without normal spines but bearing extremely sharp, tiny, hairlike projections where the spine would be (areoles). These are called glochids and are extremely irritating to the skin.
    • Very short spines - Spines thicker than glochids (sharp, hairlike projections on certain cacti) but only about 1/4 to 3/8 inch long.

Sonoran Desert Plant Definitions
Life Forms * Armaments * Leaves A * Leaves B

List of Plants of the Sonoran Desert