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Special Collections

Post Oak Savannah

The Post Oak Savannah lies just to the west of the Pineywoods and mixes considerably with the Blackland Prairies area in the south. This area includes the entire Claypan land resource area of Texas, which is part of the Southern Coastal Plains. The Post Oak Savannah, a gently rolling, moderately dissected wooded plain, is the home biota of Texas A&M University. Upland soils are gray, slightly acid sandy loams, commonly shallow over gray, mottled or red, firm clayey subsoils. They are generally droughty and have claypans at varying depths, restricting moisture percolation. The bottomland soils are reddish brown to dark gray, slightly acid to calcareous, loamy to clayey alluvial.

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scientific namecommon name(s)image gallery
Cirsium texanumTexas Thistle
Clematis crispaSwamp Leatherflower
Curly Clematis
Blue-jasmine
Curlflower
Curly Virgin's Bower
Marsh Clematis
Clematis drummondiiOld Man's Beard
Drummond's Clematis
Texas Virgin's Bower
Goat's Beard
Clematis pitcheriPurple Leatherflower
Purple Clematis
Leatherflower
Bluebill
Bellflower Clematis
Pitcher's Clematis
Cocculus carolinusCarolina Snailseed
Carolina Coralbead
Carolina Moonseed
Red Berried Moonseed
Carolina Red Berried Moonseed
Cornus drummondiiRoughleaf Dogwood
Drummond's Dogwood
Rough-leaf Dogwood
Cooperia drummondiiEvening Rain Lily
Evening Star Rain Lily
Cornus floridaFlowering Dogwood
Virginia Dogwood
Florida Dogwood
White Cornel
Arrowwood
American Boxwood
False Box
St. Peter's Crown
Corona De San Pedro
Cooperia pedunculataHill Country Rain Lily
Prairie Lily
Rain Lily
Flor De Mayo
Coreopsis tinctoriaPlains Coreopsis
Golden Tickseed
Goldenwave
Calliopsis
Crinum americanumAmerican Crinum Lily
Seven Sisters
Swamp Lily
Southern Swamp Lily
String Lily
Crinum Lily
Crataegus crus-galliCockspur Hawthorn
Cockspur Thorn
Newcastle Hawthorn
Newcastle Thorn
Hog Apple
Crataegus viridisGreen Hawthorn
Southern Hawthorn
Datura wrightiiJimsonweed
Sacred Thorn-apple
Thorn-apple
Angel Trumpet
Sacred Datura
Western Jimson Weed
Delphinium carolinianumPrairie Larkspur
Carolina Larkspur
Blue Larkspur
Delphinium carolinianum ssp. vimineumCarolina Larkspur
Prairie Larkspur
Desmanthus illinoensisIllinois Bundleflower
Bundleflower
Prairie Bundle Flower
Prickleweed
Illinois Desmanthus
Prairie Mimosa
Diospyros virginianaCommon Persimmon
Eastern Persimmon
Possumwood
Date Plum
Winter Plum
Jove's Fruit
Dracopis amplexicaulisClasping Coneflower
Clasping-leaf Coneflower
Echinacea pallidaPale Purple Coneflower
Pale Coneflower
Echinacea purpureaEastern Purple Coneflower
Purple Coneflower
Elymus canadensisCanada Wild Rye
Canadian Wildrye
Prairie Wildrye
Nodding Wildrye
Epipactis giganteaStream Orchid
Chatterbox Orchid
Giant Hellebore
Eriogonum annuumAnnual Buckwheat
Annual Wild Buckwheat
Umbrella Plant
Erythrina herbaceaCoralbean
Cherokee Bean
Red Cardinal
Eragrostis intermediaPlains Lovegrass
Plains Love Grass
Eryngium leavenworthiiLeavenworth's Eryngo
Eryngo
False Purple Thistle
Eriogonum multiflorumWild Buckwheat
Heart-sepal Buckwheat
Heart-sepal Wild Buckwheat
Eragrostis spectabilisPurple Lovegrass
Purple Love Grass
Purple Plains Lovegrass
Tumblegrass
Petticoat Climber
Eryngium yuccifoliumRattlesnake Master
Button Eryngo
Button Snakeroot
Beargrass
Bear's Grass
Euphorbia cyathophoraWild Poinsettia
Poinsettia
Fire On The Mountain
Euphorbia marginataSnow On The Mountain
Snow-on-the-mountain
Eupatorium serotinumLateflowering Thoroughwort
White Boneset
Late Boneset
Late-flowering Boneset
Fraxinus americanaWhite Ash
American Ash
Cane Ash
Smallseed White Ash
Biltmore White Ash
Biltmore Ash
Fraxinus pennsylvanicaGreen Ash
Red Ash
Swamp Ash
River Ash
Water Ash
Darlington Ash
Gaillardia pulchellaIndian Blanket
Firewheel
Girasol Rojo
Geum canadenseWhite Avens
Glandularia bipinnatifida var. bipinnatifidaPrairie Verbena
Purple Prairie Verbena
Dakota Mock Vervain
Dakota Vervain
Glandularia canadensisRose Vervain
Sweet William
Rose Mock Vervain
Gleditsia triacanthosHoney Locust
Common Honey Locust
Thorny Common Honey Locust
Honey Shucks Locust
Sweet Locust
Thorny Locust
Honey Shucks
Sweet Bean Tree
Hamamelis virginianaWitch-hazel
American Witch-hazel
Common Witch-hazel
Winterbloom
Snapping Hazelnut
Striped Alder
Spotted Alder
Tobacco-wood
Water-witch
Helenium amarumYellow Sneezeweed
Bitterweed
Yellow Bitterweed
Yellowdicks
Slender-leaved Sneezeweed
Fine-leaved Sneezweed
Yellow Dog-fennel
Helianthus angustifoliusSwamp Sunflower
Narrowleaf Sunflower
Narrow-leaved Sunflower
Heliotropium curassavicumSalt Heliotrope
Seaside Heliotrope
Quail Plant
Cola De Mico
Cola De Gama
Helianthus maximilianiMaximilian Sunflower
Max Sunflower
Heliotropium tenellumPasture Heliotrope
White Heliotrope
Hibiscus aculeatusComfortroot
Big Thicket Hibiscus
Pineland Hibiscus
Hibiscus coccineusScarlet Rosemallow
Crimson Rosemallow
Wild Red Mallow
Texas Star Hibiscus
Hibiscus laevisHalberdleaf Rosemallow
Halberdleaf Hibiscus
Scarlet Rose Mallow
Halberd-leaved Hibiscus
Halberd-leaved Rose-mallow
Hymenopappus artemisiifoliusOldplainsman
Woolly-white
Old Plainsman
scientific namecommon name(s)image gallery

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General Appearance

Lifespan

Light requirement
 Sun - 6 or more hrs
 Part shade - 2 to 6 hrs
 Shade - 2 hrs or less

Soil moisture
 Dry - no signs of moisture
 Moist - looks & feels damp
 Wet - saturated

Bloom Time
 Jan  Feb  Mar
 Apr  May  Jun
 Jul  Aug  Sep
 Oct  Nov  Dec
Bloom Color
 White  Red  Pink
 Orange  Yellow  Green
 Blue  Purple  Violet
 Brown  Black

Height (in feet)
 0-1  1-3  3-6  6-12
 12-36  36-72  72-100
 More than 100

Leaf Arrangement
 Alternate
 Opposite
 Whorled
 Fascicled

Leaf Retention
 Deciduous
 Evergreen
 Semi-evergreen