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| scientific name | common name(s) | image gallery |
| Ilex verticillata | Common winterberry Michigan holly Black alder | |
| Ilex vomitoria | Yaupon Yaupon holly Cassina | |
| Ipomopsis aggregata | Scarlet gilia Scarlet standing-cypress Skyrocket Skunkflower | |
| Ipomoea imperati | Beach morning glory Beach morning-glory | |
| Ipomopsis rubra | Standing cypress Texas plume Red Texas star Red gilia | |
| Itea virginica | Virginia sweetspire Tassel-white | |
| Juniperus ashei | Ashe juniper Ashe's juniper Mountain cedar Blueberry juniper | |
| Juniperus deppeana | Alligator juniper Checkerbark juniper Tacate Tlascal | |
| Juglans microcarpa | Little walnut Nogalito Texas walnut Texas black walnut River walnut | |
| Juniperus monosperma | Oneseed juniper One-seed juniper Cherrystone juniper | |
| Juglans nigra | Black walnut Eastern black walnut | |
| Juniperus pinchotii | Pinchot's juniper Pinchot juniper Redberry juniper | |
| Juniperus scopulorum | Rocky Mountain juniper Rocky Mountain red cedar | |
| Juniperus virginiana | Eastern red cedar Eastern redcedar Virginia juniper | |
| Krascheninnikovia lanata | Winterfat | |
| Lantana urticoides | Texas lantana Calico bush West Indian shrub-verbena | |
| Leucophyllum candidum | Brewster County barometerbush Violet silverleaf Boquillas silverleaf Purple ceniza Cenizo | |
| Leucophyllum frutescens | Cenizo Purple sage Texas ranger Texas barometer bush Texas silverleaf Texas sage | |
| Lepidium montanum | Mountain peppergrass Western peppergrass Mountain pepperweed Mountain pepperwort Montana pepperweed | |
| Leucaena pulverulenta | Great leadtree Tepaguaje | |
| Leucaena retusa | Goldenball leadtree Littleleaf leadtree | |
| Lippia alba | Bushy lippia | |
| Lindera benzoin | Northern spicebush Spicebush | |
| Linum lewisii | Wild blue flax Prairie flax Lewis flax | |
| Liatris pycnostachya | Prairie Blazing Star Kansas Ggayfeather Cat-tail Gayfeather Hairy Button-snakeroot | |
| Liquidambar styraciflua | Sweetgum American sweetgum | |
| Lobelia cardinalis | Cardinal flower | |
| Lonicera sempervirens | Coral honeysuckle Trumpet honeysuckle Woodbine | |
| Lupinus havardii | Big Bend bluebonnet Big Bend lupine Havard bluebonnet Chisos bluebonnet | |
| Lupinus texensis | Texas bluebonnet Bluebonnet Texas lupine Buffalo clover Wolf-flower | |
| Lycium berlandieri | Berlandier's wolfberry Wolfberry | |
| Lycium carolinianum | Carolina wolfberry Carolina desert-thorn Creeping wolfberry Christmas berry | |
| Maurandella antirrhiniflora | Snapdragon Vine Roving sailor Climbing snapdragon Little snapdragon vine | |
| Malvaviscus arboreus var. drummondii | Turk's cap or Turkscap Drummond's turkscap Wax mallow Drummond wax-mallow Red mallow Texas mallow Mexican apple Manzanilla Sleeping hibiscus Bleeding hearts | |
| Malpighia glabra | Acerola Barbados Cherry Manzanita Wild crapemyrtle | |
| Magnolia grandiflora | Southern magnolia Evergreen magnolia Bull bay | |
| Mahonia haematocarpa | Red barberry Algerita Red Oregon-grape | |
| Maclura pomifera | Osage orange Bois d’ arc Bodark Horse apple Hedge apple | |
| Machaeranthera tanacetifolia | Tanseyleaf tansyaster Tahoka Daisy Tansy Aster | |
| Mahonia trifoliolata | Agarita Agarito Algerita Laredo mahonia Laredo Oregon-grape Trifoliate barberry | |
| Manfreda variegata | Mottled tuberose Huaco Manfreda Texas tuberose | |
| Magnolia virginiana | Sweetbay Sweetbay magnolia Swampbay Swamp magnolia Small magnolia | |
| Melampodium leucanthum | Blackfoot Daisy Rock daisy Plains blackfoot | |
| Mimosa texana | Texas mimosa Wherry mimosa | |
| Morella cerifera | Wax myrtle Southern bayberry Candleberry | |
| Morus microphylla | Littleleaf mulberry Mountain mulberry Texas mulberry | |
| Morus rubra | Red mulberry Moral | |
| Muhlenbergia arenacea | Ear muhly | |
| Muhlenbergia emersleyi | Bullgrass Bull muhly | |
| Muhlenbergia lindheimeri | Lindheimer's muhly Big muhly Lindheimer muhly | |
| scientific name | common name(s) | image gallery |