plant identification. trees catclaw acacia bipinnately compound leaves brown, curved spines
TRANSCRIPT
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PLANTIDENTIFICATION
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TREES
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Catclaw Acacia• Bipinnately
compound leaves• Brown, curved
spines
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Catclaw AcaciaFruit: bean-likeFlower: yellow, elongated
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Whitethorn Acacia• Leaves: Bipinnately
compound• Spines: Straight, white• Bark: Reddish
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Whitethorn Acacia• Flower: yellow, spherical
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Desert Ironwood • Leaves: Simple pinnately
compound• Flowers: Purple• Spines: dark, thin, slightly
curved
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Desert Ironwood
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Velvet Mesquite • Leaves: Large, bipinnately
compound• Relatively large leaflets and
flowers
My knee for scale
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Velvet Mesquite • Fruit: bean-like• Flowers: yellow, long
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Foothills Palo Verde• Leaves: Bipinnately
compound• 4+ pairs of leaflets/“leaf”• Spines: none along
branches• Bark: green
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Foothills Palo Verde• Fruit: bean-like• Flower: yellow, with
white, upper banner petal
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Blue Palo Verde• Leaves: bipinnately compound• 3 or fewer pairs of leaflets/“leaf”• Spines along branches• Bark: Green
Spine
Spine
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Blue Palo Verde• Flower: yellow, with yellow,
upper banner petal
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Shrubs
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Fairy Duster• Leaves: Bipinnately
compound• Fine, dark green leaflets• Spines: none• Bark: whitish
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Fairy Duster• Flower: unique
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Desert Mistletoe• Parasitic• Appear as clumps in
trees most commonly
• Phainopepla is main vector
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Jojoba• Leaves: simple, vertical• Dioecious• Nuts appear on females in
spring and summer
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Jojoba• Nuts produce high quality
wax that is liquid at room temperature
Instead of sperm whale oil
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Brittlebush• Leaves: simple, entire,
triangle-shaped• Flowers: yellow (like lots of
other plants
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Brittlebush• Yellow, like
many other plants
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Limberbush• Leaves: simple, heart-
shaped• Bark: red• Flexible limbs
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Limberbush• Flowers: small, white
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Ocotillo• Multiple arms• Flowers: red, tubular• Spines: straight, stout• Drought deciduous
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Triangle-leaf Bursage• Leaves: simple, toothed,
triangle-shaped
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Triangle-leaf Bursage• Burrs in fall
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Ratany• Non-descript plant
most of year• Flowers: purple• Fruit: spined• Hemi-parasite
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Ratany
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Creosote Bush• Leaves have a single
pair of leaflets• Yellow flowers
developing into white seed pods
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Creosote Bush
Creosote bush gall and midge
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Desert Broom• Leaves more like
twigs
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Desert Broom• Leaves more like
twigs
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Burroweed• Finely divided leaves• Flowers: yellow turning to white• Last year’s flower stalks remain
for long time
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Burroweed
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Canyon Ragweed• Leaves: simple,
long, triangle-shaped with toothed margin
• Usually occurs in washes and canyons
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Canyon Ragweed• Flowers: nondescript
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Sotol (Desert Spoon)• Rosette of leaves• Leaves have spines
along edges but not at tips
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Cacti
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Saguaro
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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
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Saguaro• Seedlings• Grow under nurse
plant• Grow ½” first year• Grow 1’ in 15
years• Grow 10’ in 40
years (mature)
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Saguaro• Fruit is edible• Flower: white,
large, blooms at night and closes forever the next day
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Southwest (or Fishhook) Barrel CactusSpines: long,
hooked
Fruit: yellow
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Southwest (or Fishhook) Barrel Cactus• Flowers: yellow,
orange, or red usually
• Plant usually leans
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Hedgehog Cacti• Multiple heads
• Spines not as dense as pincushion cacti
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Prickly Pear Cacti• Pads
• Flowers: many colors
• Fruit: purple when ripe
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Fishhook Pincushion Cactus• Very dense spines
• Ring of pink flowers near top
• Spines: longest with hooks
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Chain-fruit (or Jumping) Cholla • Fruit stay attached and form
chains.• Flowers: often pink
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Chain-fruit (or Jumping) Cholla
http://waynesword.palomar.edu/plmay98.htm
Blown up 350x; overlapping scales on spine make pulling out the spine very difficult
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Teddybear Cholla
Fruit are single and do not form chains.
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Teddybear Cholla • Spines: tend to be
more dense than chain-fruit cholla
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Staghorn Cholla• Spines less dense and
arms more spreading than chain-fruit or teddy-bear cholla
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Christmas Cholla• One spine per areole• Red fruit in winter• Thin segments