''Edithcolea'' is a

monotypic genus In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispe ...

with a single species ''Edithcolea grandis'' (Persian carpet flower). Once classified in the family

Asclepiadaceae The Asclepiadoideae are a subfamily of plants in the family Apocynaceae. Formerly, it was treated as a separate family under the name Asclepiadaceae, e.g. by APG II, and known as the milkweed family. They form a group of perennial herbs, twinin ...

, it is now in the subfamily

Asclepiadoideae The Asclepiadoideae are a subfamily of plants in the family Apocynaceae. Formerly, it was treated as a separate family under the name Asclepiadaceae, e.g. by APG II, and known as the milkweed family. They form a group of perennial herbs, twinin ...

of the dogbane family

Apocynaceae Apocynaceae (, from '' Apocynum'', Greek for "dog-away") is a family of flowering plants that includes trees, shrubs, herbs, stem succulents, and vines, commonly known as the dogbane family, because some taxa were used as dog poison. Notable mem ...

. It is native to eastern Africa and to the

Arabian Peninsula The Arabian Peninsula (, , or , , ) or Arabia, is a peninsula in West Asia, situated north-east of Africa on the Arabian plate. At , comparable in size to India, the Arabian Peninsula is the largest peninsula in the world. Geographically, the ...

. The genus is named after Edith Cole (1859–1940). She collected the type material for this plant with Lort Philips in 1895, during a botanical expedition (1894–1895) led by Ethelbert Edward Lort Phillips (1857-1944) from

Berbera Berbera (; , ) is the capital of the Sahil, Somaliland, Sahil region of Somaliland and is the main sea port of the country, located approximately 160 km from the national capital, Hargeisa. Berbera is a coastal city and was the former capital of t ...

to the Golis mountains in

Somaliland Somaliland, officially the Republic of Somaliland, is an List of states with limited recognition, unrecognised country in the Horn of Africa. It is located in the southern coast of the Gulf of Aden and bordered by Djibouti to the northwest, E ...

.(ref Flor._Africa)

Description

''Edithcolea grandis'' is a

succulent In botany, succulent plants, also known as succulents, are plants with parts that are thickened, fleshy, and engorged, usually to retain water in arid climates or soil conditions. The word ''succulent'' comes from the Latin word ''sucus'', meani ...

plant with leafless, richly branched, perennial and decumbent stems with a diameter of 2 to 4 cm and up to 30 cm in length (ref prota, ref Field 80). The

glabrous Glabrousness () is the technical term for a lack of hair, down, setae, trichomes, or other such covering. A glabrous surface may be a natural characteristic of all or part of a plant or animal, or be due to loss because of a physical condition, ...

stems are 4 or 5 angled and armed with regularly placed hard and acute spinelike teeth or

tubercules In anatomy, a tubercle (literally 'small tuber', Latin for 'lump') is any round nodule, small eminence, or warty outgrowth found on external or internal organs of a plant or an animal. In plants A tubercle is generally a wart-like projection, b ...

. The base color of the plant varies from green to red with brownish spots. The

bisexual Bisexuality is romantic attraction, sexual attraction, or sexual behavior toward both males and females. It may also be defined as the attraction to more than one gender, to people of both the same and different gender, or the attraction t ...

flowers Flowers, also known as blooms and blossoms, are the reproductive structures of flowering plants ( angiosperms). Typically, they are structured in four circular levels, called whorls, around the end of a stalk. These whorls include: calyx, m ...

are 8 to 13 cm in diameter and are formed near the apex of the branches. The flower consists of an outer corolla with 5 corolla lobes (petals), which are fused halfway to the center and a relatively small inner corolla. The outside or back side of the flower is yellow to green. The inside consist of a pale yellow base color with a purple-reddish pattern of spots at the outside that gradually become smaller near the inner corona, which has itself has concentric reddish lines. Long purple hairs are present at the border of the brim of the outer corolla lobes. The flower is at times described as the Persian carpet flower. The carrion-like smell of the flowers attracts flies and other insects for

pollination Pollination is the transfer of pollen from an anther of a plant to the stigma (botany), stigma of a plant, later enabling fertilisation and the production of seeds. Pollinating agents can be animals such as insects, for example bees, beetles or bu ...

. The fruit (follicles) contain a large number of seeds. The oval shaped seeds bear a tuft of hairs (coma) so they can be dispersed with the wind. The smaller variant baylissiana (Lavros & Hardy) has more branched stems that are smaller in diameter (1 to 1.5 cm), shorter (10 cm) and are often spirally twisted.

Distribution

''Edithcolea grandis'' is distributed throughout the

African Great Lakes The African Great Lakes (; ) are a series of lakes constituting the part of the Rift Valley lakes in and around the East African Rift. The series includes Lake Victoria, the second-largest freshwater lake in the world by area; Lake Tangan ...

region (

Kenya Kenya, officially the Republic of Kenya, is a country located in East Africa. With an estimated population of more than 52.4 million as of mid-2024, Kenya is the 27th-most-populous country in the world and the 7th most populous in Africa. ...

Tanzania Tanzania, officially the United Republic of Tanzania, is a country in East Africa within the African Great Lakes region. It is bordered by Uganda to the northwest; Kenya to the northeast; the Indian Ocean to the east; Mozambique and Malawi to t ...

Uganda Uganda, officially the Republic of Uganda, is a landlocked country in East Africa. It is bordered to the east by Kenya, to the north by South Sudan, to the west by the Democratic Republic of the Congo, to the south-west by Rwanda, and to the ...

), the

Horn of Africa The Horn of Africa (HoA), also known as the Somali Peninsula, is a large peninsula and geopolitical region in East Africa.Robert Stock, ''Africa South of the Sahara, Second Edition: A Geographical Interpretation'', (The Guilford Press; 2004), ...

(

Ethiopia Ethiopia, officially the Federal Democratic Republic of Ethiopia, is a landlocked country located in the Horn of Africa region of East Africa. It shares borders with Eritrea to the north, Djibouti to the northeast, Somalia to the east, Ken ...

) and

Yemen Yemen, officially the Republic of Yemen, is a country in West Asia. Located in South Arabia, southern Arabia, it borders Saudi Arabia to Saudi Arabia–Yemen border, the north, Oman to Oman–Yemen border, the northeast, the south-eastern part ...

(including the Socotra archipelago). The plant is found in dry and arid regions. Sometimes in full sun, but mostly partly shaded by rocks and shrubby vegetation.

Usage and growth

The stem of ''Edithcolea grandis'' is eaten as a vegetable in Ethiopia and Somalia. (Ref prota, ref Getahuna 1974) ''Edithcolea grandis'' is occasionally cultivated as an ornamental in desert gardens worldwide. It has a gained a reputation as a particularly difficult plant to keep because of its very specific growing needs with much light and relatively high (above 15 °C) winter temperatures. It's very susceptible to rot in combination with low temperatures.

Literature

*D.V. Field. ''Edithcolea grandis''. Asklepios 20: 18–21, 1980. *J.J. Lavranos & D.S. Hardy. ''Edithcolea grandis'' var. ''baylissiana'' Lavranos & Hardy. Asklepios 20: 21–23, 1980. *Focke Albers und Ulrich Meve (Hrsg.): ''Illustrated handbook of succulent plants, Volume 3''. Springer-Verlag 2002, 335 pages, . *Sigrid Liede-Schumann und Ulrich Meve: ''The Genera of Asclepiadoideae, Secamonoideae and Periplocoideae (Apocynaceae)''
''Edithcolea'' - Online.
(in Englisch) *PROTA 2: Vegetables / Légumes 2004, page 292. Backhuys Publishers. *J.J. Lavranos, D.S. Hardy, 1963. *Flora of tropical Africa, Volume 4, Section 1, Daniel Oliver, L. Reeve, 1937, reprint 1958 *Diagnoses Africanæ, VII. Bulletin of Miscellaneous Information (Royal Gardens, Kew), Vol. 1895, No. 105 (1895), pp. 211–230, Royal Botanic Gardens, Kew. https://www.jstor.org/stable/4114977?seq=10 * Amare Getahuna. The role of wild plants in the native diet in Ethiopia. Agro-Ecosystems. Volume 1, 1974, Pages 45–56.

References

{{Taxonbar, from1=Q5338703, from2=Q1285246 Asclepiadoideae Garden plants Monotypic Apocynaceae genera Taxa named by N. E. Brown