Common houseleek | |
---|---|
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Order: | Saxifragales |
Family: | Crassulaceae |
Genus: | Sempervivum |
Species: | S. tectorum |
Binomial name | |
Sempervivum tectorum | |
Sempervivum tectorum, the common houseleek, [1] is a species of flowering plant in the family Crassulaceae, native to the mountains of southern Europe, cultivated in the whole of Europe for its appearance and a Roman tradition claiming that it protects buildings against lightning strikes.
Growing to 15 cm (6 in) tall by 50 cm (20 in) broad, it is a rosette-forming succulent evergreen perennial, spreading by offsets. It has grey-green, tufted, sessile leaves, 4–10 cm (2–4 in) in diameter, which are often suffused with rose-red. In summer it bears clusters of reddish-purple flowers, in multiples of 8–16, on hairy erect flat-topped stems. [2] [3] [4] [5] The species is highly variable, in part because hundreds of cultivars have been propagated, sold, and traded for nearly 200 years. [5]
Sempervivum tectorum was described in 1753 by Linnaeus, who noted that its leaves are ciliate, that is, fringed with hairs. [3]
This plant has been known to humans for thousands of years, and has attracted many common names and traditions. In addition to common houseleek, names include variations of the following:-
The specific epithet tectorum means "of house roofs", referring to a traditional location for these plants. [10]
Sempervivum tectorum is one of several houseleek species to be cultivated. It is valued as groundcover for hot, dry places. It has gained the Royal Horticultural Society's Award of Garden Merit. [11] [12]
Sempervivum tectorum multiplies horizontally by propagation of underground roots. Propagation occurs in the spring, when budding occurs. From each mother plant up to four or, on good days, ten new ones can be harvested. They come off easily when taking care not to break the roots. Seed propagation works in spring. [13]
The plant has been traditionally thought to protect against thunderstorms, and grown on house roofs for that reason, [14] which is why it is called House Leek. [6] Many of its popular names in different languages reflect an association with the Roman thunder-god Jupiter, notably the Latin barba Jovis (Jupiter's beard), referred to in the Floridus traditionally attributed to Aemilius Macer, [15] and its French derivative joubarbe, which has in turn given rise to jubard and jo-barb in English; or with the Norse thunder-god Thor as in German Donnerbart. [16] It is also called simply thunder-plant. [17] Anglo-Saxon þunorwyrt [18] [19] may have either meaning. However, the association with Jupiter has also been derived from a resemblance between the flowers and the god's beard; in modern times, it has also been called St. George's beard. [6]
Other common names, such as Anglo-Saxon singrēne, Modern English sigrim, sil-green, etc. and aye-green, [17] [20] [21] refer to its longevity. William Fernie tells a tale in support of this:
History relates that a botanist tried hard for eighteen months to dry a plant of the House Leek for his herbarium, but failed in this object. He afterwards restored it to its first site when it grew again as if nothing had interfered with its ordinary life. [6]
It has been believed to protect more generally against decay and against witchcraft. [6] Jacob Grimm quotes a Provençal troubadour: "e daquel erba tenon pro li vilan sobra lur maiso" — "and that plant they keep against evil atop their house." [22] In his Capitulare de villis vel curtis imperii , Charlemagne recommended it be grown on top of houses. [23] In some places, S. tectorum is still traditionally grown on the roofs of houses. [24] [25]
In Ireland, the houseleek was known as tóirpín and was placed over doorways and in cow-dung; it was believed to protect a house from lightning-strike or burning. [26] [27] [28] Other names included buachaill tí ("house-boy"), roofleek, waxplant or luibh a’ tóiteáin ("herb of the fire"). [29]
The juice has been used in herbal medicine as an astringent and treatment for skin and eye diseases, including by Galen and Dioscorides, to ease inflammation and, mixed with honey, to treat thrush; however, large doses have an emetic effect. [30] Pliny also mentions it, and Marcellus Empiricus listed it as a component in external treatments for contusions, nervous disorders, intestinal problems and abdominal pain, and mixed with honey, as part of the antidotum Hadriani (Hadrian's antidote), a broad-spectrum palliative for internal complaints. [31]
Romans grew the plant in containers in front of windows and associated it with love medicine. [6]
Chives, scientific name Allium schoenoprasum, is a species of flowering plant in the family Amaryllidaceae that produces edible leaves and flowers.
Jupiter, also known as Jove, is the god of the sky and thunder, and king of the gods in ancient Roman religion and mythology. Jupiter was the chief deity of Roman state religion throughout the Republican and Imperial eras, until Christianity became the dominant religion of the Empire. In Roman mythology, he negotiates with Numa Pompilius, the second king of Rome, to establish principles of Roman religion such as offering, or sacrifice.
The Crassulaceae, also known as the stonecrop family or the orpine family, are a diverse family of dicotyledon flowering plants characterized by succulent leaves and a unique form of photosynthesis, known as Crassulacean acid metabolism (CAM). Flowers generally have five floral parts. Crassulaceae are usually herbaceous but there are some subshrubs, and relatively few treelike or aquatic plants. Crassulaceae are a medium-sized monophyletic family in the core eudicots, among the order Saxifragales, whose diversity has made infrafamilial classification very difficult. The family includes approximately 1,400 species and 34–35 genera, depending on the circumscription of the genus Sedum, and distributed over three subfamilies. Members of the Crassulaceae are found worldwide, but mostly in the Northern Hemisphere and southern Africa, typically in dry and/or cold areas where water may be scarce, although a few are aquatic.
Lovage is a tall perennial plant, the sole species in the genus Levisticum in the family Apiaceae, subfamily Apioideae. It has been long cultivated in Europe and the leaves are used as a herb, the roots as a vegetable, and the seeds as a spice, especially in southern European cuisine. Its flavour and smell are reminiscent both of celery and parsley, only more intense and spicier than either. The seeds can be used in the same way as fennel seeds.
Allium tricoccum is a bulbous perennial flowering plant in the amaryllis family Amaryllidaceae. It is a North American species of wild onion or garlic found in eastern North America. Many of the common English names for this plant are also used for other Allium species, particularly the similar Allium ursinum, which is native to Eurasia. An edible plant, Allium tricoccum is used in a variety of North American and indigenous cuisines, and has also been used by Native Americans in traditional medicine. A French rendering (chicagou) of a Native American name for this plant is the namesake of the American city of Chicago.
Sempervivum is a genus of about 40 species of flowering plants in the family Crassulaceae, commonly known as houseleeks. Other common names include liveforever and hen and chicks, a name shared with plants of other genera as well. They are succulent perennials forming mats composed of tufted leaves in rosettes. In favourable conditions they spread rapidly via offsets, and several species are valued in cultivation as groundcover for dry, sunny locations.
Jovibarba is a small genus of three species of succulent flowering plants in the family Crassulaceae, endemic to mountainous regions in the southeastern quadrant of Europe. The genus is sometimes classified as a subgenus of Sempervivum, to which it is closely related. Jovibarba have pale-greenish-yellow or yellow actinomorphic flowers with about six petals, while Sempervivum have generally pinkish flowers with around twice as many petals, which open more widely than jovibarba flowers. The common name hen and chicks is applied to some Jovibarba species.
Sedum is a large genus of flowering plants in the family Crassulaceae, members of which are commonly known as stonecrops. The genus has been described as containing up to 600 species, subsequently reduced to 400–500. They are leaf succulents found primarily in the Northern Hemisphere, but extending into the southern hemisphere in Africa and South America. The plants vary from annual and creeping herbs to shrubs. The plants have water-storing leaves. The flowers usually have five petals, seldom four or six. There are typically twice as many stamens as petals. Various species formerly classified as Sedum are now in the segregate genera Hylotelephium and Rhodiola.
Hen and chicks is a common name for a group of small succulent plants. They belong to the flowering plant family Crassulaceae, native to southern Europe and northern Africa. The plants grow close to the ground with leaves formed around each other in a rosette, and propagating by offsets. The "hen" is the main, or mother, plant, and the "chicks" are a flock of offspring, which start as tiny buds on the main plant and soon sprout their own roots, taking up residence close to the mother plant.
Crepis, commonly known in some parts of the world as hawksbeard or hawk's-beard, is a genus of annual and perennial flowering plants of the family Asteraceae superficially resembling the dandelion, the most conspicuous difference being that Crepis usually has branching scapes with multiple heads. The genus name Crepis derives from the Greek krepis, meaning "slipper" or "sandal", possibly in reference to the shape of the fruit.
Andropogon is a widespread genus of plants in the grass family, native to much of Asia, Africa, and the Americas, as well as Southern Europe and various oceanic islands.
Sempervivum arachnoideum, the cobweb house-leek, is a species of flowering plant in the family Crassulaceae, native to European mountains, in the Alps, Apennines and Carpathians. Growing to 8 cm (3 in) tall by 30 cm (12 in) wide, it is a rosette-forming succulent perennial, valued in cultivation for its ability to colonise hot, dry areas via offsets.
A monastic garden was used by many people and for multiple purposes. Medieval gardens were an important source of food for households, but also encompassed orchards, cemeteries and pleasure gardens, as well as providing plants for medicinal and cultural uses. For monasteries, gardens were sometimes important in supplying the monks' livelihoods, primarily because many of the plants had multiple uses: for instance, peaches were used for closing wounds.
Hylotelephium telephium, known as orpine, livelong, frog's-stomach, harping Johnny, life-everlasting, live-forever, midsummer-men, Orphan John, witch's moneybags, and garden stonecrop is a succulent perennial plant of the family Crassulaceae native to Eurasia. The flowers are held in dense heads and can be reddish or yellowish-white. A number of cultivars, often with purplish leaves, are grown in gardens as well as hybrids between this species and the related Hylotelephium spectabile (iceplant), especially the popular 'Herbstfreude'. Occasionally garden plants may escape and naturalise as has happened in parts of North America.
Rhodiola is a genus of perennial plants in the family Crassulaceae that resemble Sedum and other members of the family. Like sedums, Rhodiola species are often called stonecrops. Some authors merge Rhodiola into Sedum.
Iris tectorum is a plant species in the genus Iris, it is also in the subgenus Limniris. It is a rhizomatous perennial. It is native of China, Korea and Burma, with lavender-blue, bluish-violet, purple-blue, blue-lilac or sky blue flowers. There is a white form as well. It is a compact plant and is cultivated as an ornamental plant in temperate regions of the world.
Sedum spathulifolium is a species of flowering plant in the family Crassulaceae known by the common names broadleaf stonecrop, yellow stonecrop, and spoon-leaved stonecrop. An evergreen perennial, it is native to western North America from British Columbia to southern California, where it can be found often in shade in many types of rocky habitat in coastal and inland hills and mountains.
Elegia tectorum, previously Chondropetalum tectorum or Restio tectorum, more commonly Cape thatching reed, or dakriet, is a member of the restio family, Restionaceae. It is a tufted perennial growing to between 1.5 and 2.25 m, with deciduous leaf sheaths. Flowers are less than 3 mm long. Petals are smooth or hairy in the upper half. E. tectorum is found in marshes and seeps on deep sand in the Western Cape and Eastern Cape of South Africa.
Eileen Barnes (1876–1956) was a notable and highly acclaimed botanical artist, well known for her definitive and accurate depictions of Ireland's plant life.
Anthyllis barba-jovis or Jupiter's beard is a species of flowering plant belonging to the family Fabaceae.
Et ille hortulanus habeat super domum suam Iovis barbam— English,
And the gardener shall have house-leeks growing on his house.; however, "Barba Iovis", in von Pauly & Wissowa (1896) , p. 2818 says he recommended including it in the garden as a domestic remedy.
In Slavic nations, the tradition of roof-top houseleeks is still practiced.