Hewett Watson

Euphorbia stygiana (Portuguese: Trovisco-macho) is a species of evergreen shrub in the family Euphorbiaceae, endemic to several islands of the Azores. It has a critically endangered subspecies (subsp. santamariae) with only 20 known remaining mature individuals in the wild.

Cerastium nigrescens var. nigrescens, commonly known as the Shetland mouse-ear, Shetland mouse-eared chickweed or Edmondston's chickweed, is an endemic variety of Arctic Chickweed, Cerastium nigrescens, found in Shetland, Scotland.[1] It was first recorded in 1837 by botanist Thomas Edmondston, who was 12 at the time. Although reported from two other sites in the 19th century, it currently grows only on two serpentine hills on the island of Unst (see Keen of Hamar). The numbers of Cerastium nigrescens var. nigrescens can vary dramatically from year to year, for reasons that are unclear

†Vicia dennesiana is a species in the Fabaceae family, named after the solicitor and plant collector George Edgar Dennes. It is protected by the Bern Convention on the Conservation of European Wildlife and Natural Habitats. This species has not been found in the wild since 1848, and is considered extinct in its natural habitat. It has not been observed in cultivation since 1922. The habitat of the species is poorly known. The available data indicate that the species developed on the sheltered slopes of Serra da Tronqueira, São Miguel Island, Azores, but the population was subsequently

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Myosotis azorica, common name Azorean mouse-ear or Azorean forget-me-not, is a plant species endemic to the Azores Islands in the North Atlantic Ocean.

Ammi trifoliatum is a species of flowering plant in the celery family Apiaceae, endemic to the Azores. It inhabits sloping areas, craters, ravines and Juniperus forests. It is native to seven of the nine islands.

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