Protea welwitschii is a species of shrub or small tree which belongs to the genus Protea,[4][7][8] and which occurs in bushveld and different types of grassland.[9]
Vernacular names given for this species include cluster-head protea, honey-scented protea and rusty velvet protea in southern tropical Africa,[6] and in South Africa the dwarf savanna sugarbush,[3][7][8]cluster-head sugarbush[3][9] or the white sugar-bush. In isiZulu it is known as isiqalaba. In Afrikaans the common names of troshofiesuikerbos,[9]kleinsuikerbos, troshofie-suikerbos, welwitsch-se-suikerbos, witsuikerbos, witsuikerboskan, and simply suikerbos, have all been recorded for this species.[3]
P. welwitschii was validly described by Adolf Engler, using the herbarium specimens Welwitsch had collected on the Huíla Plateau to typify the new species, in an issue of the Abhandlungen der Königlichen Akademie der Wissenschaften zu Berlin. This issue is the volume for the year 1891, but it was actually published in 1892.[2][10] Engler had already introduced the new taxon on June 11 of 1891 in a reading before the Koniglichen Akademie der Wissenschaften zu Berlin, titled Über die Hochgebirgsflora des tropischen Afrika[es], the same title as used in Abhandlungen,[10] and, confusingly, he had already published the name, also in 1892, in a more general article summarising his work on African montane flora in the journal Botanisches Zentralblatt[de], also titled the same as the previously mentioned reading and the Abhandlungen article, but withholding a formal species description in this work.[2][13]
Etymology
Clearly, the specific epithet commemorates the plants' discoverer, Friedrich Martin Welwitsch.[6]
Description
Protea welwitschii grows as a spreading, multi-stemmed shrub or small, gnarled, bushy tree.[6][5][8][9] In tropical East Africa and Zambia it grows to 1–3 metres (3.3–9.8ft), exceptionally 5 metres (16ft), in height.[5][14] On the Huíla Plateau in Angola in the 1850s Welwitsch measured it as growing to 12–20 feet (3.7–6.1m).[11] Plants growing in dambo in Zambia can have a strange suffrutex form, growing a number of erect, unbranched, annual or short-lived, 1 metre (3.3ft) stems from ground level.[14] In its shrub form it may have an underground bole or root-stock, from which the branches arise.[8][14] The trunk grows to 30 centimetres (12in) in diameter at the base.[5][11] It is gnarled, and covered in an irregularly fissured, brown-black bark.[5] The young stems are covered in a brown, tomentose fuzz.[14]
The leaves are elliptic to oblanceolate in shape, bluish-green in colour, and up to 12 by 9.5cm in size.[9] Young leaves are densely covered with velvety white or brown hairs, usually becoming hairless when mature,[6][9] except for at their base.[9]
The flower heads are terminal at the end of branches, and usually grouped in clusters of two,[6] or three or four, and are up to 6cm in diameter. The bracts encircling the inflorescence are coloured white to pale cream according to one source,[9] or pale yellowish to brown according to another,[6] and are covered in silky hairs.[9] The bracts can also be pink, although this is uncommon.[14] The inner bracts are oblong in shape, and are 5 by 1.5cm in size.[9] The actual flowers are densely hairy. They are coloured creamy-white, and turn rusty brown with age.[6] The plant is monoecious with both sexes in each flower.[8]
The fruit is a densely hairy nut.[9] The seeds are not stored for years in the inflorescences such as in some other Protea, but are released nine to twelve months after flowering, and are dispersed by means of the wind, after this simply lying on the ground until an opportune time for germination presents itself.[8]
Infraspecific variation
It is a variable species regarding morphology.[6][5] In 1963 John Stanley Beard recognised seven different subspecies, the nominate, four which had been formerly seen as independent species but which were now subsumed under P. welwitschii, and two new to science.[5] These subspecies are not recognised by most workers.[3][6][5] Young plants often have different characteristics than older, more mature plants, markedly in the pubescence on their leaves.[11]
Similar species
It may be confused with the similar P. gaguedi. It can be distinguished by the larger, solitary inflorescences, and the completely glabrous mature leaves.[9]
According to Hyde et al.. P. welwitschii is easy to differentiate from the other Protea species in southern tropical Africa, by dint of its velvety-haired young leaves.[6]
It occurs in various habitats,[5][8] such as bushveld,[3][9]thornveld, sourveld,[3] wooded slopes, rocky hillsides,[6]miombo[6][5] and ericaceousfynbos. In East Africa it usually is found in montane grassland at 1,800 to 2,900 metres in altitude. In central and southeastern tropical Africa it may also occur in other grasslands such as low altitude dambos or other wet grassy places to 1,220 metres in altitude,[5] as well as occasionally in wooded grassland, rocky grassland[6] or normal grasslands at 1,500 to 2,400 metres in altitude.[5][9] In South Africa it has been recorded as occurring at 300 to 2,000 metres;[5][8] while it primarily occurs in various types of mountainous bushveld and grassland,[3][9] in some eastern areas it is found in grassland near the coast.[3] It has been recorded at 1,390 to 1,500 metres in Mozambique.[6]
It is often found in rocky places.[9] It will grow on steep slopes. It has been found growing in quartzitesandstone-derived soils in Mozambique.[6] In South Africa it has been recorded from soils derived from dolomite, sandstone, shale or andesite, as well as in sandy soils.[3] In areas of Zambia it can tolerate levels of copper and nickel in the soil which are toxic to most trees or shrubs.[14]
It blooms in the Summer to Autumn.[7][9] In Southern Africa from December to May,[6][8][14] with the peak in Zambia from February to March,[14] and in South Africa mainly from January to February. It is pollinated by beetles and birds.[8]
The adult plant is able to survive the periodic wildfires that burn through its habitat by re-sprouting from the underground bole.[8]
Conservation
This species was first added as P. welwitschii subsp. welwitschii to the Red data list of southern African plants as 'not threatened' by the South African National Biodiversity Institute (SANBI) in 1996,[3][8] in 2009 this same taxon was assessed as 'least concern', and a large international team from across Africa under auspices of SANBI upheld this latter status for the entire species in the 2019 reassessment. According to the 2019 SANBI assessment the overall population numbers are stable.[3]
The population of the species as a whole in KwaZulu-Natal was listed as 'lower risk - near threatened' in a 1999 publication.[3]
Related Research Articles
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Olea welwitschii, the Elgon teak, is a species of tree in the family Oleaceae. It ranges across parts of subsaharan Africa, from Cameroon in the west to Ethiopia and Kenya in the east, and south to Angola, Zambia, and Mozambique. It is a forest species, ranging from lowland tropical rainforests to evergreen montane forests.
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Protea glabra, also called the Clanwilliam sugarbush, is a flowering shrub belonging to the genus Protea.
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Protea wentzeliana, also known as Wentzel's sugarbush, is a shrub belonging to the genus Protea.
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1 2 3 4 5 6 7 8 9 10 Bingham, Mark; Willemen, Annette; Wursten, Bart; Ballings, Petra; Hyde, Mark (2020). "Protea welwitschii Engl". Flora of Zambia. Mike Bingham, Annette Willemen, Bart Wursten, Petra Ballings and Mark Hyde. Retrieved 27 July 2020.
↑ Geerling, Chris (15 July 1982). "Guide de Terrain des Ligneux Sahéliens et Soudano-Guinéens". Mededelingen Landbouwhogeschool Wageningen (in French). 82 (3): 262–265.
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