Friedrich Vierhapper

Avicennia marina, commonly known as grey mangrove or white mangrove, is a species of mangrove tree classified in the plant family Acanthaceae (formerly in the Verbenaceae or Avicenniaceae). As with other mangroves, it occurs in the intertidal zones of estuarine areas.

Teucrium socotranum is a species of flowering plant in the family Lamiaceae. It is found only in the Socotra Islands, part of the nation of Yemen. Its natural habitat is rocky areas.

Teucrium balfourii is a perennial subshrub in the family Lamiaceae, native only to the islands of Socotra and Samhah in the Socotra Archipelago of Yemen. It was formally described in 1907 by the Austrian botanist Friedrich Karl Max Vierhapper, based on material collected by Isaac Bayley Balfour in the late 19th century. The species is named in the latter′s honor.

Soldanella carpatica is a species of flowering plant in the primrose family native to Slovakia and Poland.

Lycium sokotranum is a species of flowering plant in the nightshade family, Solanaceae, that is endemic to the Socotra archipelago in the Indian Ocean (Yemen). It is a spiny, much-branched shrub that is <2 m tall. It is widespread and often abundant on coastal plains and limestone plateaus of Socotra and on the central plains of Abd al Kuri.

Euphorbia kuriensis is a species of plant in the family Euphorbiaceae. It is endemic to Abd al Kuri in the Socotra Archipelago of Yemen. Its natural habitat is subtropical or tropical dry shrubland.

Indigofera sokotrana is a species of plant in the family Fabaceae. It is endemic to the Hajhir Mountains of Socotra in Yemen. The natural habitat of Indigofera sokotrana is subtropical or tropical dry forests.

Heliotropium wagneri is a species of plant in the family Heliotropiaceae. It is endemic to the islands of Abd al Kuri and Samhah in Yemen's Socotra archipelago. Its natural habitats are subtropical or tropical dry shrubland and subtropical or tropical dry lowland grassland.

Heliotropium riebeckii is a species of plant in the family Heliotropiaceae. It is endemic to the island of Socotra in Yemen. Its natural habitats are subtropical or tropical dry shrubland and subtropical or tropical wet lowland grassland.

Euphorbia kischenensis is a species of plant in the family Euphorbiaceae. It is endemic to Socotra in Yemen. Its natural habitats are subtropical or tropical dry forests and subtropical or tropical dry shrubland.

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Ruellia kuriensis is a species of plant in the family Acanthaceae. It is a subshrub endemic to the island of Abd al Kuri in the Socotra archipelago off the coast of northeastern Africa, which is politically part of Yemen. Its natural habitat is subtropical or tropical dry shrubland.

Heliotropium sokotranum, aka Heliotropium socotranum, is a species of flowering plant in the family Heliotropiaceae. It is endemic to the island of Socotra. Its natural habitats are subtropical or tropical dry forests and subtropical or tropical dry shrubland.

Heliotropium shoabense is a species of plant in the family Heliotropiaceae. It is endemic to Yemen.

Dactyloctenium hackelii is a species of grass in the family Poaceae. It is native to the islands of Socotra and Abd al Kuri in Yemen's Socotra Archipelago. It grows in sandy coastal grassland from sea level to 20 metres elevation.

Campanula balfourii is a species of flowering plant in the bellflower family Campanulaceae. It is endemic to northeastern Socotra, Yemen. Its natural habitat is subtropical or tropical dry forests.

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Ruellia paulayana is a species of plant in the family Acanthaceae. It is endemic to the island of Socotra in Yemen.

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Oldenlandia pulvinata is a species of plant in the family Rubiaceae. It is a cushion-forming subshrub endemic to the islands of Socotra, Abd al Kuri, and Samhah in Yemen's Socotra Archipelago. It is widespread in shrubland and in rocky areas on plains and limestone plateaus from sea level to 800 metres elevation.

Oldenlandia aretioides is a species of flowering plant in the family Rubiaceae. It is a subshrub endemic to northwestern and southeastern Socotra in Yemen. It was collected in the 19th Century near Qallansiyah and near Wadi Faleng at opposite ends of the island, and hasn't been seen since. It is similar to O. pulvinata, but with smaller leaves and calyx.

Sabulina mediterranea is a species of flowering plant in the family Caryophyllaceae (carpetweeds). It is an annual native to the Mediterranean Basin region, including parts of southern Europe (Albania, Balearic Islands, Bulgaria, Corsica, East Aegean Islands, France, Greece, Italy, Crete, Portugal, Sicily, Spain, European Turkey, and former Yugoslavia), north Africa (Algeria, Egypt, Libya, Morocco, and Tunisia) and western Asia (Cyprus, Israel and Palestine, and Turkey).

Hibiscus macropodus is a species of flowering plant in the family Malvaceae. It is found only in Yemen.

Heliotropium paulayanum is a species of plant in the family Heliotropiaceae. It is endemic to the island of Abd al Kuri in Yemen's Socotra Archipelago. Its natural habitat is subtropical or tropical dry shrubland.

Erigeron petiolaris is a species of flowering plant in the family Asteraceae. It is native to northern and central Asia (Siberia, Xinjiang, Kazakhstan, Uzbekistan). Erigeron petiolaris a perennial herb up to 28 cm tall, with a short rhizome. It produces flower heads one at a time or in groups of 2 or 3, each head containing pink or white ray florets and yellow disc florets. The species grows in arctic or alpine regions on rocky slopes.

Erigeron eriocalyx is a Eurasian species of flowering plants in the family Asteraceae. The species is a widespread flower species in the arctic, subarctic, alpine and subalpine meadows in Russia, Kazakhstan, Mongolia, Inner Mongolia, and Xinjiang. Erigeron eriocalyx is a perennial, clump-forming herb up to 25 cm (10 inches) tall, forming a branching underground caudex. Its flower heads have violet, purple, lilac, or white ray florets surrounding yellow disc florets.

Withania adunensis is a species of plant in the family Solanaceae. It is a shrub endemic to the island of Socotra in Yemen. It is widespread in succulent shrubland and drought deciduous woodland from sea level to 650 metres elevation. It closely resembles Withania riebeckii.

Lindenbergia sokotrana is a species of plant in the family Orobanchaceae. It is endemic to Socotra.

Heliotropium kuriense is a species of plant in the family Heliotropiaceae. It is endemic to the island of Abd al Kuri in Yemen. Its natural habitat is subtropical or tropical dry shrubland.