John Littner Clark

Grias longirachis is a species of woody plant in the family Lecythidaceae. It is found only in Ecuador. Its natural habitats are subtropical or tropical moist lowland forests and subtropical or tropical moist montane forests.

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Glossoloma martinianum is a plant species in the Gesneriaceae family. A recent review has moved it out of the genus Alloplectus. It is endemic to Ecuador. Its natural habitat is subtropical or tropical moist montane forests.

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Glossoloma penduliflorum is a plant species in the family Gesneriaceae. A recent review has moved it out of the genus Alloplectus. It is endemic to Ecuador. Its natural habitat is subtropical or tropical moist montane forests.

Glossoloma herthae is a plant species in the family Gesneriaceae. A recent review has moved it out of the genus Alloplectus. It is endemic to Ecuador. Its natural habitat is subtropical or tropical moist montane forests.

Shuaria is a genus of arborescent flowering plants belonging to the family Gesneriaceae. The genus is represented by just one species, Shuaria ecuadorica D.A.Neill & J.L.Clark, endemic to Ecuador. The generic name refers to the Shuar indigenous group of Amazonian Ecuador where several collections were made from the forests owned by the Shuar communities. Furthermore, the known range of S.ecuadorica corresponds quite closely to the ancestral Shuar territory in Pastaza, Morona-Santiago, and Zamora-Chinchipe provinces.

Pagothyra is a genus of flowering plants belonging to the family Gesneriaceae. It contains a single species, Pagothyra maculata, an epiphyte native to Venezuela, Guyana, and French Guiana.

Pachycaulos is a genus of flowering plants belonging to the family Gesneriaceae. It has two species, Pachycaulos nummularia and Pachycaulos huancabambae. Its native range is Southeastern Mexico to Peru.

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Christopheria is a genus of flowering plants belonging to the family Gesneriaceae. It contains a single species, Christopheria xantha, a subshrub native to Venezuela and French Guiana in northern South America.