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Hex River Arid Alluvium Fynbos

Hex River Arid Alluvium Fynbos

Hex River Arid Alluvium Fynbos is a critically endangered vegetation type that is restricted to the floor of Hex River Valley, reaching as far as De Wet near Worcester. It may be considered a subtype of Breede Alluvium Fynbos. The altitude mostly ranges between 200 and 350 m, with some patches reaching higher.

The landscape features undulating plains and alluvial fans and streams.

The vegetation is a relatively tall shrub mixture with graminoid (grassy) understorey. Asteraceous and proteoid fynbos dominant, with localised restioid fynbos. Succulent and Renosterveld elements not uncommon.

The soil is alluvial deposits consisting of rounded cobbles in loamy sand over sediments of the Malmesbury and Bokkeveld shales.

The area receives 480 mm rain on average, mostly in winter. Frost infrequent. Well fed with water from mountains.

Important Taxa

The riverine portions support Metrosideros angustifolia, Searsia angustifolia, Restio paniculatus, Diospyros glabra and Freylinia lanceolata. The areas away from the rivers support Anthospermum spathulatum, Searsia dissecta, Seriphium sp., Struthiola ciliata, Passerina sp., Muraltia spinosa, Willdenowia incurvata, Helichrysum moeserianum, Montinia caryophyllacea, Protea laurifolia, Aspalathus rugosa, A. acuminata, A. biflora, Leucadendron barkerae, Cliffortia crenata, C. ruscifolia, Restio capensis, Euryops tenuissimus, Cephalophyllum sp. and Antimima sp.

Endemic Taxa

Unknown.

Conservation

Critically endangered. Only a few patches have not been transformed by vine cultivation and urban development. Riverine areas seriously invaded by Acacia mearnsii (black wattle) and Eucalyptus sp. (blue gum), and Casuarina sp. (beefwood).

References

  • Helme, N. A. 2007. Botanical report: Fine scale vegetation mapping in the Upper Breede River Valley. Report for CapeNature, as part of the C.A.P.E. programme.
  • Mucina, L., Rutherford, M.C. 2006. The vegetation of South Africa, Lesotho and Swaziland. Strelitzia 19.

Species in this vegetation type

Athanasia trifurcata
Athanasia trifurcata

kouterbos

Asteraceae
Babiana ambigua
Babiana ambigua

bobbejaantjie

Iridaceae
Calobota cytisoides
Calobota cytisoides

gannabos

Fabaceae
Cliffortia ruscifolia
Cliffortia ruscifolia

steekbos, bergklimmersvriend

Rosaceae
Crassula dichotoma
Crassula dichotoma

Crassulaceae
Cyanella hyacinthoides
Cyanella hyacinthoides

blou raaptol

Tecophilaeaceae
Dicerothamnus rhinocerotis
Dicerothamnus rhinocerotis

renosterbos

Asteraceae
Dodonaea viscosa
Dodonaea viscosa

ysterhout, sandolien

Sapindaceae
Eriocephalus africanus
Eriocephalus africanus

kapokbos

Asteraceae
Euphorbia tuberosa
Euphorbia tuberosa

melkbol

Euphorbiaceae
Euryops tenuissimus
Euryops tenuissimus

harpuisbos, resin bush

Asteraceae
Ferraria variabilis
Ferraria variabilis

spinnekopblom

Iridaceae
Geissorhiza ornithogaloides
Geissorhiza ornithogaloides

sysie

Iridaceae
Gladiolus carinatus
Gladiolus carinatus

blou afrikaner

Iridaceae
Haemanthus sanguineus
Haemanthus sanguineus

velskoenblaar

Amaryllidaceae
Hermannia althaeifolia
Hermannia althaeifolia

wolhaarpoproos, lanternbos

Malvaceae
Hermannia confusa
Hermannia confusa

poprosie

Malvaceae
Hermannia filifolia
Hermannia filifolia

rooipoprosie, mooiblompleisterbos, red doll's rose

Malvaceae
Lobostemon glaucophyllus
Lobostemon glaucophyllus

agtdaegeneesbos

Boraginaceae
Microloma sagittatum
Microloma sagittatum

bokhorinkies, melktou, rockcandy minimouth

Apocynaceae
Moraea flaccida
Moraea flaccida

groottulp, rooitulp

Iridaceae
Moraea fugax
Moraea fugax

soetuintjie, hottentotuintjie

Iridaceae
Muraltia spinosa
Muraltia spinosa

skilpadbessie, tortoise berry

Polygalaceae
Nemesia barbata
Nemesia barbata

leeubekkie

Scrophulariaceae
Nemesia ligulata
Nemesia ligulata

kappieblommetjie, leeubekkie

Scrophulariaceae
Oedera squarrosa
Oedera squarrosa

vierkantperdekaroo

Asteraceae
Oftia africana
Oftia africana

sukkelbossie

Scrophulariaceae
Oxalis convexula
Oxalis convexula

cushion woodsorrel

Oxalidaceae
Oxalis hirta
Oxalis hirta

suring

Oxalidaceae
Oxalis obtusa
Oxalis obtusa

geeloogsuring, yellow-eyed sorrel

Oxalidaceae
Protea laurifolia
Protea laurifolia

grys suikerbos

Proteaceae
Protea nitida
Protea nitida

waboom

Proteaceae
Psammotropha anguina
Psammotropha anguina

Molluginaceae
Salvia chamelaeagnea
Salvia chamelaeagnea

bloublomsalie

Lamiaceae
Satyrium erectum
Satyrium erectum

geel trewwa

Orchidaceae
Scabiosa columbaria
Scabiosa columbaria

jongmansknoop

Dipsacaceae
Searsia angustifolia
Searsia angustifolia

taaibos, wilgerkorentebos

Anacardiaceae
Ursinia chrysanthemoides
Ursinia chrysanthemoides

bergmagriet

Asteraceae
Viscum rotundifolia
Viscum rotundifolia

rooibessievoëlent, red berry mistletoe

Santalaceae
Wachendorfia paniculata
Wachendorfia paniculata

koffiepit

Haemodoraceae
Zantedeschia aethiopica
Zantedeschia aethiopica

varklelie, arum lily

Araceae