Plants & Trees Encyclopedia

Hydrangea — Hydrangea, common names Hydrangea and Hortensia) is a genus of about 70-75 species of flowering plants native to southern and eastern Asia (from Japan to China, the Himalaya and Indonesia) and North and South America. The flowers are extremely common in the Azores Islands of Portugal, particularly on Faial Island, which is known as the “blue island” due …

Hyacinth — A Hyacinth is any plant of genus Hyacinthus, which are bulbous herbs formerly placed in the lily family Liliaceae but now regarded as the type genus of the separate family Hyacinthaceae. Hyacinths are native to the eastern Mediterranean region east to Iran and Turkmenistan. Hyacinths are sometimes associated with rebirth. The Hyacinth flower is used in the Haftseen …

Horseradish — Horseradish (Armoracia rusticana, syn. Cochlearia armoracia) is a perennial plant of the Brassicaceae family, which includes mustard, wasabi, and cabbages. The plant is probably native to southeastern Europe and western Asia, but is popular around the world today. It grows up to 1.5 metres (five feet) tall and is mainly cultivated for its large white, tapered root. The …

Horse Chestnut — The genus Aesculus comprises 20–25 species of deciduous trees and shrubs native to the temperate northern hemisphere, with 7–10 species native to North America and 13–15 species native in Eurasia; there are also several natural hybrids. They have traditionally been treated in their own usually monogeneric family Hippocastanaceae, but genetic evidence has led to this family, along …

Hornbeam — Plants in the genus Carpinus (Cár-pi-nus) are commonly called Hornbeams. They are relatively small hardwood trees. Many botanists place the hornbeams in the birch family Betulaceae, though some group them with the hazels (Corylus) and hop-hornbeams (Ostrya) in a segregate family, Corylaceae. The 30-40 species occur across much of the north temperate regions, with the greatest number of …

Hops — Hops are the female flowers of the hop plant (Humulus lupulus). They are used primarily as a flavouring and stability agent in beer, and also for other beverages and in herbal medicine. The first documented use in beer is from the eleventh century. Hops contain several characteristics favourable to beer, balancing the sweetness of the malt with bitterness, …

Hop Hornbeam — Hophornbeam, Ostrya is a genus of eight to ten small deciduous trees belonging to the birch family Betulaceae. Its common name is Hophornbeam in American English and Hop-hornbeam in British English. It may also be called ironwood, a name shared with a number of other plants. The genus is native in southern Europe, southwest and eastern Asia, …

Honeysuckle — Honeysuckles Lonicera; syn. Caprifolium Mill.) are arching shrubs or twining vines in the family Caprifoliaceae, native to the Northern Hemisphere. There are about 180 species of honeysuckle, with by far the greatest diversity in China, where over 100 species occur; by comparison, Europe and North America have only about 20 native species each. Widely known species include Lonicera …

Honey Locust — The Honey locust (Gleditsia triacanthos) is a deciduous tree native to eastern North America. It is mostly found in the moist soil of river valleys ranging from southeastern South Dakota to New Orleans and central Texas, and as far east as central Pennsylvania. Honey locusts can reach a height of 20–30 m (66–100 ft), with fast growth, …

Leadwort — Plumbago is a genus of 10-20 species of flowering plants in the family Plumbaginaceae, native to warm temperate to tropical regions of the world. Common names include plumbago and leadwort (names which are also shared by the genus Ceratostigma). The name Plumbago is derived from Latin plumbum (“lead”), either from the lead-blue flower colour of some species (OED), …