Edward E. Terrell

Mexotis is a genus of flowering plants belonging to the family Rubiaceae. Its native range is Southern Mexico to Guatemala. Species: Mexotis kingii (Terrell) Terrell & H.Rob. Mexotis latifolia (M.Martens & Galeotti) Terrell & H.Rob. Mexotis lorencei Terrell & H.Rob. Mexotis terrellii (Lorence) Terrell & H.Rob.

Stenaria is a genus of flowering plants in the family Rubiaceae. It is a small genus, consisting of around six species native to the United States, Mexico, and The Bahamas. All species of Stenaria are restricted to Mexico and the southwestern United States, except for the wide-ranging Stenaria nigricans which extends northward and eastward. Stenaria are herbaceous perennials or low shrubs. Flowers are produced in cymes, and can be white, purple, or pink. Stenaria can be morphologically distinguished from the similar genus Hedyotis by its non-crateriform seeds. Stenaria was first recognized as

Oldenlandiopsis (creeping-bluet) is a genus of flowering plants in the family Rubiaceae. It is monospecific, comprising only one species, Oldenlandiopsis callitrichoides. This species had previously been placed in Hedyotis or in Oldenlandia. It is native to the West Indies, southern Mexico, and Central America. It is naturalized elsewhere, including Florida, Hawaii, South America, and tropical Africa. Oldenlandiopsis was established in 1990 by Edward E. Terrell and Walter H. Lewis. The generic name indicates a likeness to Oldenlandia. The specific epithet refers to a superficial resemblance

Houstonia micrantha, the southern bluet, is a plant species in the coffee family. It is native to the south-central United States where it has been found in Texas, Louisiana, Arkansas, Mississippi, southern Missouri, Alabama, western Tennessee, extreme western Florida (Escambia County) plus a few isolated locations in Georgia.

Stenotis is a genus of flowering plants belonging to the family Rubiaceae. Its native range is Arizona (USA) to Mexico. Species: Stenotis arenaria (Rose) Terrell Stenotis asperuloides (Benth.) Terrell

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Houstonia teretifolia is a plant species in the family Rubiaceae, endemic to the Mexican state of Coahuila. Houstonia teretifolia is distinguished by other species in the genus by having leaves that are terete, i.e., long and narrow, round in cross-section.

Houstonia spellenbergii is a plant species in the family Rubiaceae. It is native to the western part of the state of Chihuahua in northern Mexico, at an elevation of approximately 2100 m in the Sierra Madre Occidental near the Basaseáchic waterfall.

Houstonia sharpii, the Hidalgo bluet, is a plant species in the family Rubiaceae. It is a herbaceous perennial up to 30 cm tall, spreading by means of stolons spreading along the surface of the ground. It also has white flowers. It is native to the states of Hidalgo, Puebla and Veracruz in Mexico.

Houstonia rosea, commonly known as the rose bluet, is a species of flowering plant in the family Rubiaceae. It is native to the central and southeastern United States, where it occurs in a variety of disturbed and open habitats.

Houstonia ouachitana, the Ouachita bluet, is a species of plants in the coffee family. It is endemic to the Ouachita Mountains of Arkansas and Oklahoma. It is an herb up to 20 cm tall, with lanceolate basal leaves and narrowly linear cauline leaves.

Houstonia correllii, the Zapata County bluet, or Correll's bluet, is a species of plants in the Rubiaceae. It is known only from Zapata County in southern Texas. It is a prostrate, mat-forming plant with white flowers.

Carterella is a monotypic genus of flowering plants in the family Rubiaceae. The genus contains only one species, viz. Carterella alexanderae, which is endemic to Baja California Sur in Mexico. It grows on steep slopes in the mountains.

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