Title: Brayera
Additional Names: Kousso; kosso; cusso; koso; cousso; kouso; kusso
Literature References: Dried panicles of pistillate flowers of Hagenia abyssinica J. F. Gmel. (Brayera anthelmintica Kunth), Rosaceae. Habit. Abyssinia. Constit. Kosin, kossein, kosidin, protokosin, kosotoxin, volatile oil, tannin. Ref: Leisenring, Arch. Pharm. 232, 50 (1894); Kondakow, ibid. 237, 481 (1899); Hess, Todd, J. Chem. Soc. 1937, 562; Birch, Todd, ibid. 1952, 3102.
Therap-Cat: Anthelmintic (Cestodes).
Therap-Cat-Vet: Has been used as a teniacide.
Brazilin Brefeldin A Brequinar Bretylium Tosylate Brevetoxins

Hagenia abyssinica
Hagenia abyssinica
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Rosales
Family: Rosaceae
Subfamily: Rosoideae
Tribe: Sanguisorbeae
Subtribe: Agrimoniinae
Genus: Hagenia
Species: H. abyssinica
Binomial name
Hagenia abyssinica

Hagenia abyssinica is a species of flowering plant native to the high-elevation Afromontane regions of central and eastern Africa. It also has a disjunct distribution in the high mountains of East Africa from Sudan and Ethiopia in the north, through Kenya, Uganda, Rwanda, Burundi, Democratic Republic of Congo, and Tanzania, to Malawi and Zambia in the south.

It is known in English as African redwood, East African Rosewood,[1] brayera, cusso, hagenia, or kousso, in Amharic as kosso, and in Swahili as mdobore or mlozilozi. It is the sole species of genus Hagenia, and its closest relative is the Afromontane genus Leucosidea. Synonyms include Banksia abyssinica, Brayera anthelmintica, Hagenia abyssinica var. viridifolia and Hagenia anthelmintica.

It is a tree up to 20 m in height, with a short trunk, thick branches, and thick, peeling bark. The leaves are up to 40 cm long, compound with 7-13 leaflets, each leaflet about 10 cm long with a finely serrated margin, green above, silvery-haired below. The flowers are white to orange-buff or pinkish-red, produced in panicles 30-60 cm long.

It is generally found from 2000-3000 m elevation, in areas receiving 1000-1500 mm of rainfall annually. It can be found growing in mixed afromontane forest with Podocarpus, Afrocarpus, and other trees, and in drier afromontane forests and woodlands where Hagenia is dominant, or in mixed stands of Hagenia and Juniperus procera. It is often found near the upper limit of forest growth.

Hagenia is used as a food plant by the larvae of some Lepidoptera species including Turnip Moth.