Philip Barker Webb

Aeonium, the tree houseleeks, is a genus of about 35 species of succulent, subtropical plants of the family Crassulaceae. Many species are popular in horticulture. The genus name comes from the ancient Greek αἰώνιος / aiōnios (ageless). While most of them are native to the Canary Islands, some are found in Madeira, Cape Verde, Morocco, in East Africa (Ethiopia, Somalia, Uganda, Tanzania and Kenya) and Yemen.

Quercus trojana, the Macedonian oak, is a species of plant in the oak and beech family (Fagaceae). It is native to southeast Europe and southwest Asia, and is placed in the turkey oak section (Quercus sect. Cerris).

Descurainia is a genus of plants in the family Brassicaceae which are known commonly as the tansymustards. The genus name commemorates French botanist and herbalist François Descurain (1658–1749). The plants are similar in appearance to other mustards, sending up long erect stems and bearing small yellow or whitish flowers. Many species are noxious weeds. Some species are toxic to livestock and become a nuisance when they grow in grazing fields. Plants of this genus are found worldwide in temperate regions. Descurainia sophia, (flixweed or herb sophia), is the type species of Descurainia.

Argyranthemum (marguerite, marguerite daisy, dill daisy) is a genus of flowering plants belonging to the family Asteraceae. Members of this genus are sometimes also placed in the genus Chrysanthemum. The genus is endemic to Macaronesia, occurring only on the Canary Islands, the Savage Islands, and Madeira. Argyranthemum frutescens is recorded as a food plant of the leaf-mining larva of the moth Bucculatrix chrysanthemella.

Juniperus cedrus, the Canary Islands juniper, is a species of juniper, native to the western Canary Islands (Tenerife, La Palma, Gran Canaria, Gomera) and Madeira (J. cedrus Webb & Berthel. subsp. maderensis (Menezes) Rivas Mart et al.), where it occurs at elevations of 500–2400 m. It is closely related to Juniperus oxycedrus (Prickly Juniper) of the Mediterranean region and Juniperus brevifolia (Azores Juniper) of the Azores. It is a large shrub or tree growing to a height of 5–20 m (rarely 25 m). The leaves are evergreen, needle-like, in whorls of three, green to glaucous-green, 8–23 mm

Aichryson is a genus of 16 species of succulent, subtropical plants, native to the Canary Islands, Azores, and Madeira. The species of Aichryson are not frost-resistant. They are related to Sempervivum, Jovibarba, Greenovia, Aeonium and Monanthes, readily seen in their similar flowers. The genus name comes from a contraction of the Greek "aei" (always) and "chrysos" (gold). Several species are cultivated as ornamental plants. The hybrid cultivar Aichryson × aizoides var. domesticum 'Variegatum' is a recipient of the Royal Horticultural Society's Award of Garden Merit.

Aeonium arboreum, the tree aeonium, tree houseleek, or Irish rose, is a succulent, subtropical subshrub in the flowering plant family Crassulaceae.

Retama raetam is a species of flowering plant in the family Fabaceae, native to northern Africa from the Western Sahara to Sudan, Sicily, Israel, Sinai Peninsula, the Palestine region and Saudi Arabia, and widely naturalized elsewhere.

Echium pininana, commonly known as the tree echium, pine echium, giant viper's-bugloss, or tower of jewels, is a species of flowering plant in the borage family Boraginaceae. It is endemic to the Canary Islands, where it is restricted to the island of La Palma. Echium pininana is an endangered species, and is listed in Appendix I to, and is therefore protected under, the Convention on the Conservation of European Wildlife and Natural Habitats. The specific epithet pininana is Latin for "small pine", though E. pininana is neither closely related to the pine, nor does it resemble that plant.

Fumana thymifolia, the thyme leaved fumana, is a species of shrub in the family Cistaceae. They have a self-supporting growth form and simple, broad leaves and dry fruit. Individuals can grow to 30 cm tall.

Aeonium tabuliforme, the flat-topped aeonium or saucer plant, is a species of succulent plant in the family Crassulaceae, native and endemic to Tenerife in the Canary Islands. It is low-growing, typically reaching about 5 cm high but up to 45 cm in diameter. It grows on moist, north-facing cliffs and ledges at low altitude. A mass of fleshy, hairy, bright green leaves in flat rosettes is produced on short unbranched stems, often on vertical surfaces. This species is short-lived and dies after flowering. Plants often take 3–4 years to flower, at which point they produce a tall (40–60 cm)

Aeonium glutinosum is a species of flowering plant in the family Crassulaceae endemic to Madeira, Portugal. It has fairly thick leaves and its appearance varies depending on its growing conditions. One characteristic is the very sticky stem of the inflorescence. The main flower is shown but small stalks with flowers continue to appear for several months.

Euphorbia regis-jubae is a species of flowering plant in the family Euphorbiaceae, native to the eastern Canary Islands, western Morocco, north-western Western Sahara. The specific epithet honours the contributions of King Juba II to natural history and his role in bringing the genus to notice. In Spanish, it is known as tabaiba morisca. It has often been confused with Euphorbia lamarckii.

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Aeonium undulatum is a succulent, evergreen flowering plant in the family Crassulaceae. It is a subshrub, one of the larger species of Aeonium with an 8–12 inches (200–300 mm) rosette of bright, glossy green leaves often over a metre from the ground on a single, unbranched stem. Other rosettes do not branch off this stem (normally) but grow from the bottom, unlike most aeoniums. The plant is monocarpic so the flowering stem will die after producing its yellow inflorescence, which is normally after about 5 years. Aeonium undulatum is native and endemic to Gran Canaria in the Canary islands.

Aeonium glandulosum is a species of subshrub of the family Crassulaceae endemic to the Madeira archipelago (Madeira Island, Porto Santo Island and Desertas Islands).

Aeonium haworthii, also known as Haworth's aeonium or pinwheel, is a species of succulent flowering plant in the family Crassulaceae. It is grown as a houseplant in temperate regions. It has gained the Royal Horticultural Society's Award of Garden Merit, as has the cultivar 'Variegatum'.

Aeonium canariense is a species of flowering plant in the family Crassulaceae. It forms large rosettes of leaves close to the ground but the spikes of yellow flowers stand up to 70 cm tall. It is endemic to the Canary Islands, with five subspecies native to different islands. Subspecies canariense is native of Tenerife in the Canary Islands, where it grows on dry slopes and cliffs in the north of the island from sea level to about 1300m.

Aichryson villosum is a species of herbaceous flowering plants in the family Crassulaceae endemic to the Madeira Archipelago. The species was first described by Sabin Berthelot and Philip Barker-Webb in 1840, published in Natural History of the Canary Islands. Aichryson santamariensis was previously included in this species, but is now (since November 2015) considered a different species endemic to Santa Maria Island, Azores.

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Aeonium urbicum is a succulent species of flowering plant in the family Crassulaceae. It is endemic to Tenerife, one of the Canary Islands, where it grows on the north of the island from Teno point to the Anaga peninsula. Until 1999, it was also considered a resident of La Gomera, another Canary Island, but that year the populations on that island were considered a new species and named Aeonium appendiculatum. Aeonium urbicum was also divided into varieties, var. urbicum and var. meridionale.

Aeonium balsamiferum (Spanish: bejeque farrobo) is a species of tropical flowering plant in the family Crassulaceae. The species is endemic in the Canary Islands.

Adenocarpus viscosus is a shrubby species of flowering plant in the legume family Fabaceae, subfamily Faboideae. It is endemic to the Canary Islands where it is known locally as Codeso del Pico. It can be found above 1,800 metres (5,900 ft) on two of the islands, La Palma in Caldera de Tabouriente and Tenerife where it is a dominant shrub in Teide National Park and occurs in parts of Corona Forestal Nature Park and Reserva Especial de las Palomas.

Malva arborea (previously known as Lavatera arborea, or, more recently as Malva eriocalyx), the tree mallow, is a species of mallow native to the coasts of western Europe and the Mediterranean region, from Ireland and Britain south to Algeria and Libya, and east to Greece.

Bencomia is a genus of four rare plant species, which grow as woody, branching shrubs with glossy, evergreen leaves and central, pendulous inflorescences with small flowers followed by densely packed, globular fruits. Mature heights range from 1 to 4 meters. They are endemic to the Canary Islands and Madeira. The genus was originally described by botanists Philip Barker-Webb and Sabin Berthelot and is named after Bencomo.

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Aeonium cuneatum is a succulent species of flowering plant in the family Crassulaceae. It is native to the island of Tenerife in the Canary Islands. It has a large leaf rosette and no stem. The leaves are smooth but have a grey shine to the upper surface which can be rubbed. It offshoots easily which makes a large group of Aeoniums across the ground. The flower is yellow and more open than the flowers of some other Aeonium species. The Latin specific epithet cuneatum means "wedge-shaped;" this refers to the shape of the leaves.

Aeonium ciliatum is a species of flowering plant in the family Crassulaceae that produces large green leaf rosettes, which can be 50 centimetres (20 in) across. The rosettes emerge from a woody stem that branches freely and can become very top heavy. It is endemic to Tenerife in the Canary Islands, where it prefers some shade, and is frequent in the Anaga peninsula in the north east of the island.

Ulex densus (Portuguese: tojo-gatunho or tojo-da-charneca) is an evergreen shrub in the family Fabaceae endemic to Portugal.

Polycarpaea nivea is a species of flowering plants in the family Caryophyllaceae. The species was described by William Aiton in 1828 as Achyranthes nivea, and it was placed in the genus Polycarpaea by Philip Barker Webb in 1849. The specific name nivea is Latin for "white as snow", and refers to the colour of the plant.