Flora of Southern U.S.

Yucca pallida, sometimes called pale yucca, is a species of yucca native to Northern Mexico and parts of the blackland prairies of northern and central Texas, and notable for its light-colored leaves that range from a pale blue-gray to sage-green in color. The rosettes average 20–50 cm tall and 30–80 cm in diameter, with leaves 15–40 cm long and 2–3 cm wide, being widest around the midpoint. The rosettes sit directly on the ground, with little or no trunk. The leaves have a yellow to brown terminal spine, and are generally flat, possibly with some waviness or rolling along the edges. The

Quercus robusta, also called robust oak, is a rare North American species of oak. It has been found only in the Chisos Mountains inside Big Bend National Park in western Texas. Quercus robusta is a deciduous tree growing up to 13 metres (43 feet) tall. The bark is black or brown, the twigs dark reddish brown. The leaves are up to 12 centimetres (4+3⁄4 inches) long, with a few teeth or small lobes along the edges. The tree grows in moist, wooded canyons.

Yucca intermedia McKelvey is a species in the family Asparagaceae, with the common name intermediate Yucca. It is a relatively small plant forming clumps of rosettes. It is native to dry steppes, juniper-pinyon woodlands and savannahs, and desert grassland areas of the northwestern quarter of the US State of New Mexico, then into the Four Corners region, at an elevation of 1,400–2,300 m (4,600–7,500 ft).

Salvia engelmannii (Engelmann's sage, Engelmann's salvia) is a herbaceous perennial that is endemic to the limestone hills of central Texas. Salvia engelmannii forms a mound 1 to 1.5 ft (0.30 to 0.46 m) tall with velvety leaves. The flowers are pale lavender, growing on 4 to 6 in (10 to 15 cm) spikes.

Brazorion is a genus of plants in the family Lamiaceae, first described in 1845. It contains three known species, all endemic to the US state of Texas. The name Brazoria refers to the Brazos River. Brazoria arenaria Lundell - southern Texas Brazoria enquistii M.W.Turner - central Texas Brazoria truncata (Benth.) Engelm. & A.Gray - south-central to east-central Texas Formerly included: Brazoria scutellarioides Engelm. & A.Gray = Warnockia scutellarioides (Engelm. & A.Gray) M.W.Turner - Oklahoma, Texas, Coahuila

Nolina lindheimeriana, also known as devil's shoestring and beargrass, is a perennial species of plant in the asparagus family Asparagaceae.

Vitis monticola, commonly known as mountain grape, or sweet mountain grape, is a North American species of wild grape native to Texas. It is important to grape growers for its resistance to drought; a quality exploited both genetically in hybridization, and in grafting.

Rhododon, commonly referred to as sandmint, is a genus of flowering plant in the mint family (Lamiaceae) first described in 1939. It contains two known species, Rhododon ciliatus (Texas sandmint) and Rhododon angulatus (angled sandmint) Both species are endemic to the state of Texas in the United States.

Prunus texana, called peachbush, Texas almond cherry, Texas peachbush, sand plum, peach bush, duraznillo and wild peach is native to central and western Texas. Although it looks like peach, it actually belongs to Prunus sect. Prunocerasus together with other North American plum species.

Allium elmendorfii, or Elmendorf's onion, is a species of wild onion endemic to Texas. It is known only from Bexar, Frio, Wilson, and Atascosa Counties. It is generally found on sandy soils, specifically "well-drained sands, Eocene, Pleistocene and Holocene sands, and has only a 400 x 160 km range." Its habitat is "Forest/Woodland, Savanna, Woodland - Hardwood" and specifically "{g}rassland openings in post oak (Quercus stellata) woodlands on deep, well-drained sands derived from Queen City and similar Eocene formations." Allium elmendorfii is a perennial bulb-forming herb with clusters of

Zizania texana is a rare species of grass known by the common name Texas wild rice. It is endemic to Texas, where it is found only on the upper San Marcos River in Hays County. It is threatened by the loss and degradation of its habitat. It is a federally listed endangered species of the United States.

Yucca tenuistyla is a species of flowering plant in the family Asparagaceae found in brushlands near the coast of Texas, at elevations below 200 m (650 feet). Common names include white-rimmed yucca and whiterim yucca. Yucca tenuistyla is a short, acaulescent (trunkless) species forming colonies of rosettes. Leaves can be up to 70 cm (28 inches) long but only 2 cm (0.8 inches) wide. The flowering stalk can be up to 100 cm (33 inches) tall, bearing many pendant flowers. Fruits are dry, with glossy black seeds.

Vaseyochloa is a monotypic genus in the grass family Poaceae. Its sole species, the flowering plant Vaseyochloa multinervosa, is endemic to Texas. It is commonly known as Texasgrass.

Salvia pentstemonoides (Big red sage) is a species of herbaceous flowering plant in the family Lamiaceae. It is a perennial that is rare in nature and native to only a few locations in Texas, including the Edwards Plateau. The plant remains endangered due to destruction of habitat, drought, and browsing by deer. The severe Texas drought of the 1950s may have contributed to its decline. Big red sage was thought to be extinct beginning around 1946, until it was rediscovered by botanist Marshall Enquist in 1980 while shooting pictures for his Wildflowers of the Texas Hill Country. At first,

Quercus canbyi (Canby oak, Sierra oak), synonyms including Quercus graciliformis, is a North American species of oak tree.

Prunus murrayana, called the Murray's plum, is a critically endangered shrub native to Texas. It is found in the Edwards Plateau and the trans-Pecos regions of the state. Prunus murrayana is a thorny, deciduous shrub up to 5 meters (almost 17 feet) tall, forming clumps by means of sprouts formed at the base of the plant. The leaves are hairy on both surfaces, usually folding along the midrib. The flowers are white, usually appearing about the same time as the leaves. The fruits are red with white dots, hairless but with a waxy coating on the outside. It is purportedly so rare that no one has

Monarda maritima, the seaside beebalm, is a species of flowering plant in the family Lamiaceae. It is endemic to deep sandy soils of the Coastal Bend of Texas. A perennial herb, it can reach 3 ft (0.9 m), sometimes taller.

Chloris texensis is a species of grass known by the common name Texas windmill grass. It is endemic to Texas in the United States, where it occurs on the coastal prairies. This perennial grass forms clumps of stems up to 30 to 45 centimeters tall. The leaf blades are up to 15 centimeters long. The inflorescence is a panicle with several long, spreading branches arranged in a whorl. Each branch is up to 20 centimeters long and has 3 to 4 spikelets per centimeter along the distal part. Flowering occurs in October and November. This plant grows on sparsely vegetated stretches of coastal prairie,

Carex mckittrickensis, the Guadalupe Mountain sedge, is a species of sedge endemic to Guadalupe Mountains National Park in western Texas. It occurs on the sides of steep ravines and also in riparian forests.

Allium coryi, common name yellowflower onion, is a plant species endemic to trans-Pecos Texas, but sometimes cultivated as an ornamental elsewhere. It is reported in the wild from only five counties: Brewster, Presidio, Jeff Davis, Pecos and Terrell. Some of the populations lie inside Big Bend National Park. Allium coryi grows on rocky slopes and plains at elevations of 800–1400 m. It produces egg-shaped bulbs up to 2 cm long. Flowers are bright yellow, up to 10 mm across; anthers and pollen are yellow.

Yucca necopina Shinners, the Brazos River yucca or Glen Rose yucca, is a species in the family Asparagaceae. It is a rare endemic native to a small region in north-central Texas.

Tradescantia humilis, the Texas spiderwort, is a species of Tradescantia native to Texas and southern Oklahoma. It was named after John Tradescant (1608–1662) who served as gardener to Charles I of England. It was described by US botanist Joseph Nelson Rose in 1899.

Ruellia drummondiana (syn. Dipteracanthus drummondianus Nees), also known as Drummond's wild petunia, is a flowering plant endemic to central Texas in the United States. It was first collected by naturalist Thomas Drummond and first described in 1847. R. drummondiana stands up to 3' with an herbaceous dark green ridged stem and purple flowers. Unlike the majority of Ruellia in the United States, R. drummondiana produces fruit with only 2–4 seeds, as opposed to 6–20 as is common throughout the genus.

Monarda viridissima is a species of flowering plant in the mint family. It is commonly known as green beebalm and Texas beebalm.

Monarda humilis is a species of flowering plant in the mint family (Lamiaceae). It is a small, aromatic herb native to the southwestern United States, where it occurs in dry, open habitats. The species was historically treated as a variety of Monarda punctata and was elevated to species rank in the early 21st century following taxonomic revision.

Hoffmannseggia tenella is a rare species of flowering plant in the legume family known by the common name slender rushpea. It is endemic to Texas, where it is known from only two counties. It persists in small remnants of its gulf coastal prairie habitat. It is a federally listed endangered species of the United States. This is a small perennial herb growing up to 15 centimeters tall from a woody taproot. It may grow in colonies. The plant has leaves up to 6 centimeters long which are made up of 5 to 7 pairs of leaflets. The flowers have petals about half a centimeter long in shades of

Helianthus praecox is a North American species of sunflower known by the common name Texas sunflower. It is endemic to Texas. Most of the populations are either along the Gulf Coast or in the Río Grande Valley. Helianthus praecox grows on sandy soils and coastal prairies. It is an annual herb up to 150 cm (60 inches or 5 feet) tall. One plant usually produces 1-3 flower heads, each containing 11-16 yellow ray florets surrounding 35 or more red or purple disc florets. Subspecies Helianthus praecox subsp. hirtus (Heiser) Heiser - near Carrizo Springs in Dimmit County Helianthus praecox subsp.

Hedeoma todsenii is a rare species of flowering plant in the family Lamiaceae known by the common name Todsen's pennyroyal, or Todsen's false pennyroyal. It is endemic to New Mexico in the United States, where it occurs in the San Andres and Sacramento Mountains. It is federally listed as an endangered species of the United States. This plant was discovered on the White Sands Missile Range in 1978 by Thomas K. Todsen (1918-2010) and described to science and named for him the following year. It is a rhizomatous perennial herb growing up to 20 centimeters tall with fragrant lance-shaped leaves.

Eriogonum gypsophilum is a rare species of wild buckwheat known by the common names Seven River Hills buckwheat and gypsum wild buckwheat. It is endemic to the state of New Mexico in the United States, where it is known from only three sites in Eddy County. It is limited to a specific type of soil which is high in gypsum. The plant has been federally listed as a threatened species of the United States since 1981.

Elymus texensis, commonly called Texas wildrye, is a species of flowering plant in the grass family (Poaceae). It is native to United States, where it is endemic to the Edwards Plateau of Texas. Its natural habitat is on calcareous bluffs in Juniperus woodlands and grassy areas. Elymus texensis is a recently discovered and poorly known species. It was described to science in 2006. It is currently only documented from three collections, although further surveys will likely reveal more localities. It appears to be most morphologically similar to Elymus pringlei, which is found further south in