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PLANT IDENTIFICATION. TREES. Catclaw Acacia. Bipinnately compound leaves Brown, curved spines. Catclaw Acacia Fruit: bean-like Flower: yellow, elongated. Whitethorn Acacia. Leaves: Bipinnately compound Spines: Straight, white Bark: Reddish. Whitethorn Acacia. Flower: yellow, spherical.

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  2. TREES

  3. Catclaw Acacia • Bipinnately compound leaves • Brown, curved spines

  4. Catclaw AcaciaFruit: bean-likeFlower: yellow, elongated

  5. Whitethorn Acacia • Leaves: Bipinnately compound • Spines: Straight, white • Bark: Reddish

  6. Whitethorn Acacia • Flower: yellow, spherical

  7. Desert Ironwood • Leaves: Simple pinnately compound • Flowers: Purple • Spines: dark, thin, slightly curved

  8. Desert Ironwood

  9. My knee for scale Velvet Mesquite • Leaves: Large, bipinnately compound • Relatively large leaflets and flowers

  10. Velvet Mesquite • Fruit: bean-like • Flowers: yellow, long

  11. Foothills Palo Verde • Leaves: Bipinnately compound • 4+ pairs of leaflets/“leaf” • Spines: none along branches • Bark: green

  12. Foothills Palo Verde • Fruit: bean-like • Flower: yellow, with white, upper banner petal

  13. Blue Palo Verde Spine • Leaves: bipinnately compound • 3 or fewer pairs of leaflets/“leaf” • Spines along branches • Bark: Green Spine

  14. Blue Palo Verde • Flower: yellow, with yellow, upper banner petal

  15. Shrubs

  16. Fairy Duster • Leaves: Bipinnately compound • Fine, dark green leaflets • Spines: none • Bark: whitish

  17. Fairy Duster • Flower: unique

  18. Desert Mistletoe • Parasitic • Appear as clumps in trees most commonly • Phainopepla is main vector

  19. Jojoba • Leaves: simple, vertical • Dioecious • Nuts appear on females in spring and summer

  20. Jojoba • Nuts produce high quality wax that is liquid at room temperature Instead of sperm whale oil

  21. Brittlebush • Leaves: simple, entire, triangle-shaped • Flowers: yellow (like lots of other plants

  22. Brittlebush • Yellow, like many other plants

  23. Limberbush • Leaves: simple, heart-shaped • Bark: red • Flexible limbs

  24. Limberbush • Flowers: small, white

  25. Ocotillo • Multiple arms • Flowers: red, tubular • Spines: straight, stout • Drought deciduous

  26. Triangle-leaf Bursage • Leaves: simple, toothed, triangle-shaped

  27. Triangle-leaf Bursage • Burrs in fall

  28. Ratany • Non-descript plant most of year • Flowers: purple • Fruit: spined • Hemi-parasite

  29. Ratany

  30. Creosote Bush • Leaves have a single pair of leaflets • Yellow flowers developing into white seed pods

  31. Creosote Bush Creosote bush gall and midge

  32. Desert Broom • Leaves more like twigs

  33. Desert Broom • Leaves more like twigs

  34. Burroweed • Finely divided leaves • Flowers: yellow turning to white • Last year’s flower stalks remain for long time

  35. Burroweed

  36. Canyon Ragweed • Leaves: simple, long, triangle-shaped with toothed margin • Usually occurs in washes and canyons

  37. Canyon Ragweed • Flowers: nondescript

  38. Sotol (Desert Spoon) • Rosette of leaves • Leaves have spines along edges but not at tips

  39. Cacti

  40. Saguaro

  41. Saguaro • Seed • 2000 seeds/fruit • 100 fruits/year • 100-150 years = 20 million+ seeds in lifetime, • But only one survives to replace individual in stable population

  42. Saguaro • Seedlings • Grow under nurse plant • Grow ½” first year • Grow 1’ in 15 years • Grow 10’ in 40 years (mature)

  43. Saguaro • Fruit is edible • Flower: white, large, blooms at night and closes forever the next day

  44. Southwest (or Fishhook) Barrel Cactus Spines: long, hooked Fruit: yellow

  45. Southwest (or Fishhook) Barrel Cactus • Flowers: yellow, orange, or red usually • Plant usually leans

  46. Hedgehog Cacti • Multiple heads • Spines not as dense as pincushion cacti

  47. Prickly Pear Cacti • Pads • Flowers: many colors • Fruit: purple when ripe

  48. Fishhook Pincushion Cactus • Very dense spines • Ring of pink flowers near top • Spines: longest with hooks

  49. Chain-fruit (or Jumping) Cholla • Fruit stay attached and form chains. • Flowers: often pink

  50. http://waynesword.palomar.edu/plmay98.htm Blown up 350x; overlapping scales on spine make pulling out the spine very difficult Chain-fruit (or Jumping) Cholla

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