Crocosmia (
Description
They can be
evergreen or
deciduous that grow from basal underground
corms. The alternate leaves are cauline (stem-borne) and ensiform (sword-shaped). The blades are parallel-veined. The margin is entire. The corms form in vertical chains, with the youngest at the top, and oldest and largest buried most deeply in the soil. The roots of the lowermost corm in a chain are contractile roots and drag the corm deeper into the ground where conditions allow. The chains of corms are fragile and easily separated, a quality that has enabled some species to become invasive and difficult to control in the garden.
They have colourful of 4 to 20 vivid red and orange alternate flowers on a horizontally divaricate (branched) stem. The terminal inflorescence can have the form of a cyme or a raceme. These flower from early summer well into autumn. The flowers are sessile on a flexuose (zigzag) arched spike. The fertile flowers are hermaphrodite. All have an equal length. The style branches are apically forked. They are pollination by insects, birds (sunbirds) or by the wind. The dehiscent capsules are shorter than they are wide.
The genus name is derived from the Greek words krokos, meaning "saffron", and osme, meaning "odour" – from the dried leaves emitting a strong smell like that of saffron (a spice derived from Crocus – another genus belonging to the Iridaceae) when immersed in hot water.
The alternative name montbretia is still widely used, especially for the garden hybrid C. × crocosmiiflora.
Species
Species accepted by Kew Plants of the World Online:
-
Crocosmia ambongensis (H.Perrier) Peter Goldblatt & J.C.Manning – Madagascar
-
Crocosmia aurea (Pappe ex Hook.) Planch. (Falling Stars) – eastern + southern Africa from Cape Province to Sudan; naturalised in Azores
-
Crocosmia × crocosmiiflora (Victor Lemoine) N.E.Br. – South Africa; naturalised in parts of Europe, Rwanda, Zaire, Assam, Norfolk Island in Australia, Fiji, the Caribbean, Argentina, Tristan da Cunha ( C. aurea × C. pottsii)
-
Crocosmia fucata (John Lindley) M.P.de Vos – Kamiesberg Mountains in Cape Province of South Africa
-
Crocosmia masoniorum (Louisa Bolus) N.E.Br. (Giant montbretia) – Cape Province, KwaZulu-Natal
-
Crocosmia mathewsiana (L.Bolus) Goldblatt ex M.P.de Vos – Drakensberg Mountains in Mpumalanga
-
Crocosmia paniculata (Klatt) Goldblatt (Aunt Eliza) – Lesotho, Eswatini, South Africa
-
Crocosmia pearsei Oberm. – Lesotho, Free State, Drakensberg Mountains in Mpumalanga
-
Crocosmia pottsii (Baker) N.E.Br. (Pott's montbretia) – Cape Province, KwaZulu-Natal
Garden hybrids
-
Crocosmia × crocosmiiflora
Cultivation
Crocosmias are grown worldwide, and more than 400 cultivars have been produced. Some hybrids have become
invasive species, especially
C. ×
crocosmiiflora hybrids, which are invasive in the UK,
Ireland,
Australia,
New Zealand,
,
and the West Coast of the United States.
Crocosmia are winter-hardy in temperate regions. They can be propagated through division, removing offsets from the corm in spring.
24 cultivars possessed the Royal Horticultural Society's Award of Garden Merit in 2023, including:
-
Crocosmia × crocosmiiflora 'Carmin Brillant'
-
Crocosmia × crocosmiiflora 'Star of the East'
-
Crocosmia 'Hellfire'
-
Crocosmia 'Lucifer'
-
Crocosmia 'Paul's Best Yellow'
-
Crocosmia 'Severn Sunrise'
==Gallery==
Notes
External links
-
De Vos, M. P. (1999) " Crocosmia". Flora of Southern Africa 7: 129–138.
-
Peter Goldblatt, John Manning, Gary Dunlop, Auriol Batten - Crocosmia and Chasmanthe (Royal Horticultural Society Plant Collector Guide)
-
Kostelijk, P.J. (1984) " Crocosmia in gardens". The Plantsman 5: 246–253.
