Raphia australis

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Raphia (rahf-EE-ah)
australis (aw-STRAHL-iss)
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SOUTH AFRICA: Kirstenbosch Botanical Garden, Cape Town. Photo by D. L. Nickrent
Scientific Classification
Genus: Raphia (rahf-EE-ah)
Species:
australis (aw-STRAHL-iss)
Synonyms
None set.
Native Continent
Africa
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Morphology
Habit: Solitary
Leaf type: Pinnate
Culture
Survivability index
Common names
Kosi Palm, Kosi Bay Giant Raffia Palm, Kosi palm (Eng. & Afr.); umVuma (Zulu); iMali (Ronga).

Habitat and Distribution

South Africa. Cape Provinces, KwaZulu-Natal, and Mozambique. The 'natural'
"Growing in Kirstenbosch in chilly Cape Town. Giant, look at people for scale. Its flowering at top." Photo by Kyle Wicomb
distribution of the Kosi palm is restricted to a small area stretching from just south of Kosi Bay to 40 km or further north of Maputo. The population at Mtunzini is descended from cultivated trees. These trees are found on seasonally inundated dunes, and have pneumatophores (breathing roots) like mangroves. (plantzafrica.com H.F. Glen Natal Herbarium)

Description

Tree, often up to 16 m tall, rarely stemless, usually solitary, this genus is monoecious, also monocarpic. Leaves pinnate, often very large; petiole unarmed; rhachis with small ascending spines, leaflets reduplicate (central fold up, like an upside-down V), linear, 450-?650 x 50 mm, margin and midrib spiny. The inflorescence (flower spike) is covered by an enormous sheath up to 3 m long, which falls away allowing the inflorescence to continue skywards (resembles a floral rocket launch!) Peduncle (flower stalk) covered by 2-ranked, imbricate, gaping bracts; branches and abbreviated flowering branchlets laterally compressed, laxly arranged or congested in one plane; bracts 2-ranked, imbricate. Flowers 2-ranked, female near base; males on upper part of spadix. Male flower with a 2-keeled bracteole; calyx tubular or 3-lobed; petals 3, free or nearly so; stamens 6 to many, free or joined. Female flower with an outer and an inner bracteole and a joined calyx and corolla; staminodial ring joined to corolla; anthers minute or not present; ovary 3-locular, with 1 ovule developing; style short with 3 stigmas or not present. Fruit 1-seeded, ovoid, 60-?90 x 30-?50 mm, covered with brown, imbricate scales arranged in vertical rows, each with a median groove; apex beaked. (plantzafrica.com H.F. Glen Natal Herbarium) Editing by edric.

Culture

Fresh seed grows easily once the outer scales have been removed. Seedlings need filtered sunlight, plentiful water and protection from wind. Very little, if anything, else is known about the cultivation of these palms. In particular, I have yet to see one attacked by a pest or disease. However, untreated fruits used for ornament may eventually be subject to attack by cigarette beetles and other similar insects. The usual treatments (freezing, fumigation, insecticide spray) are adequate to control this provided that the damage is noticed in time. (plantzafrica.com)

Likes full sun, and bad drainage. Given these conditions, they are very fast growing, one of the fastest of all palms. If you don't have a swamp, then give them lots of water. Needs at least a sub-tropical climate. Cold Hardiness Zone: 10b

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Comments and Curiosities

Palms have the largest leaves of all trees, and Raphia has the largest leaves of all palms. One species of these monsters is indigenous to South Africa, and that is the majestic Kosi palm. (plantzafrica.com H.F. Glen Natal Herbarium)


External Links

References

Phonetic spelling of Latin names by edric.

Special thanks to Geoff Stein, (Palmbob) for his hundreds of photos.

Special thanks to Palmweb.org, Dr. John Dransfield, Dr. Bill Baker & team, for their volumes of information and photos.

Glossary of Palm Terms; Based on the glossary in Dransfield, J., N.W. Uhl, C.B. Asmussen-Lange, W.J. Baker, M.M. Harley & C.E. Lewis. 2008. Genera Palmarum - Evolution and Classification of the Palms. Royal Botanic Gardens, Kew. All images copyright of the artists and photographers (see images for credits).


Many Special Thanks to Ed Vaile for his long hours of tireless editing and numerous contributions.

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