Native Trees & Shrubs of the Southern US & Northern Mexico

The region spanning the US Gulf Coastal Plain, South Texas Plains, and northeastern Mexico shares a Tamaulipan/Subtropical biome with rich, overlapping flora. Key native species:

Trees

• Oaks: Live Oak (Quercus virginiana – iconic sprawling evergreen), Texas Red Oak (Q. buckleyi), Mexican Blue Oak (Q. oblongifolia), Post Oak (Q. stellata).
• Pines: Longleaf (P. palustris – fire-dependent, historic), Slash (P. elliottii), Loblolly (P. taeda – plantation dominant), Pinyon (P. cembroides – SW edge).
• Cypress: Bald Cypress (Taxodium distichum – swamps, "knees"), Montezuma Cypress (T. mucronatum – Mexico).
• Maples: Red Maple (Acer rubrum – wet areas), Box Elder (A. negundo), Bigtooth Maple (A. grandidentatum – TX hill country/Mexico).
• Pecan (Carya illinoinensis – state tree TX, river bottoms).
• Mesquite (Prosopis glandulosa – iconic thorny, nitrogen-fixing, invasive in grasslands).
• Huisache / Sweet Acacia (Vachellia farnesiana – fragrant yellow balls).
• Retama / Jerusalem Thorn (Parkinsonia aculeata – green bark, yellow flowers).
• Texas Ebony (Ebenopsis ebano – dense, evergreen, thorny).
• Anacua / Sandpaper Tree (Ehretia anacua – rough leaves, white flowers).
• Mexican Olive (Cordia boissieri – large white flowers).

Shrubs / Woody Perennials

• Agarita (Mahonia trifoliolata – holly-like, yellow flowers, red berries).
• Texas Sage / Cenizo (Leucophyllum frutescens – silver leaves, purple rain-triggered blooms).
• Creosote Bush (Larrea tridentata – desert signature, resinous scent after rain).
• Fourwing Saltbush (Atriplex canescens – saline soils).
• Flame Acanthus (Anisacanthus quadrifidus – hummingbird magnet, red tubes).
• Turk's Cap (Malvaviscus arboreus – red whorled flowers, shade).
• Chile Pequin (Capsicum annuum var. glabriusculum – native hot pepper).
• Ornamentals (Native Range): Yaupon Holly (Ilex vomitoria – caffeinated tea), American Beautyberry (Callicarpa americana – purple berries), Wax Myrtle (Morella cerifera – bayberry scent).

Many "southern" ornamentals (Azalea, Camellia, Gardenia, Hydrangea, Crape Myrtle) are Asian introductions, not native. The native palette above is drought-hardy, wildlife-supporting, and regionally authentic.