Orbea lutea (N. E. Br.) Bruyns
Stapelia rogersii, Caralluma rogersii, Angolluma rogersii, Pachycymbium rogersii
Orbea rogersii is a succulent plant that forms clumps of erect or ascending stems. It grows up to 4 inches (10 cm) tall, spreading up to 20 inches (50 cm) in diameter. Flowers are up to 1.4 inches (3.5 cm) in diameter, usually not expanding fully, deeply, and narrowly lobed, smooth and pale green outside with few darker veins and pale greenish-yellow to white inside.
USDA hardiness zones 10a to 11b: from 30 °F (−1.1 °C) to 50 °F (+10 °C).
How to Grow and Care
Several species are fairly easy to grow. Others, often those with slightly hairy stems and the more unusual flowers, are more challenging and require careful watering (with some fertilizer) during the growing season and complete withdrawal of water during the winter months. A minimum winter temperature of 50 °F (10 °C) is acceptable, providing that plants are kept absolutely dry. A heated growing bench or incubator may help delicate plants to get through the colder months. However, many species live under shrubs in habitat and prefer light shade rather than full sun.
A gritty compost is essential, and clay pots are advisable for the more delicate species. Some growers prefer a mineral-only compost to minimize the chance of a fungal attack on the roots. A layer of grit on the surface of the compost prevents moisture from accumulating around the base of the stems.
Keeping Stapelias and their roots free of pests such as mealybugs is the real key to success as fungal attack often occurs due to damage to stems by an insect.
Learn more at How to Grow and Care for Stapelia.
Orbea rogersii is native to Botswana and Zimbabwe.
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Other sources of information about Orbea rogersii:
African Plants: A Photo Guide (Senckenberg): Orbea rogersii
African Plant Database: Orbea rogersii
BHL (Biodiversity Heritage Library): Orbea rogersii
EOL (Encyclopedia of Life): Orbea rogersii
ePIC (electronic Plant Information Center): Orbea rogersii
Flora Zambesiaca web site: Orbea rogersii
GBIF (Global Biodiversity Information Facility): Orbea rogersii
Google: Web - Images - Scholar
GRIN (Germplasm Resources Information Network): Orbea rogersii
iNaturalist: Orbea rogersii
IPNI (International Plant Names Index): Orbea rogersii
JSTOR Plant Science: Orbea rogersii
Kew Herbarium catalogue: Orbea rogersii
Mansfeld World Database of Agricultural and Horticultural Crops: Orbea rogersii
Plants of the World Online: Orbea rogersii
Tropicos: Orbea rogersii
Wikipedia: Orbea rogersii
Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2002-21
Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2021). Flora of Zimbabwe: Species information: Orbea rogersii.
https://www.zimbabweflora.co.zw/speciesdata/species.php?species_id=146730, retrieved 26 March 2021
Site software last modified: 26 March 2018 2:01pm (GMT +2)
Orbea rogersii - garden
Origin and Habitat: Botswana (and Zimbabwe?).
Habitat and ecology: Orbea rogersii grows in varying soils, in grasslands, among sparse trees.
- Orbea rogersii (L. Bolus) Bruyns
- Angolluma rogersii (L. Bolus) Plowes
- Caralluma rogersii (L. Bolus) E.A.Bruce & R.A.Dyer
- Pachycymbium rogersii (L. Bolus) M.G.Gilbert
- Stapelia rogersii L. Bolus
Description: Orbea rogersii (L. Bolus) Bruyns was at first regarded as a Stapelia but its characters, taken together, seem to place it better in Orbea or Caralluma. It is, however, rather an anomalous form which has no close relatives. It is a dwarf soft stemmed succulent quite widespread in cultivation for the attractive and often very numerous bright yellow flowers with clavate and vibratile hairs which form a fringe in the centre of the corolla. These hairs hardly remain still and move in the slightest breeze, possibly attracting insects. In age forms big clumps or mats of vegetation.
Stems: Erect or ascending, and branching from the base to 10 cm long and 8 mm wide, sides grooved Tubercles subulate, very acute, ascending or horizontally spreading.
Inflorescences: 3 - 4 per stem, several-flowered. Peduncle 13-15 mm long. Sepals 3 - 4 mm long. Corolla 30-35 mm in diameter pale yellow, flat, deeply incised, united part 5.6 mm in diameter. Corolla lobes up to 14 mm long and less than 4 mm wide linear, acute, bent inwards or ascending, margins in the upper part revolute, onside basally ciliate, club-shaped. Hairs transparent 1.7 mm long directed inwards. Corona yellowish ca. 3.5 mm in diameter, margins purple. Outer and inner coronal lobes only basally shortly united. Inner corona lobes about 2 mm long rectangular, inside with longitudinal groove, apically toothed, basally spreading horizontally, apically bent upwards. Outer corona lobes broadly triangular when seen from above, divided into 2 filiform appendages to the base, apical appendage 5. 7 mm erect ascending over the style head and intertwined, basal appendage 5 5 mm, filiform, erect, inter-twined with itself.
Bibliography: Major references and further lectures
1) Focke Albers, Ulrich Meve “Illustrated Handbook of Succulent Plants: Asclepiadaceae: Asclepiadaceae, Volume 4” Springer Science & Business Media, 2002
2) Doreen Court “Succulent Flora of Southern Africa” CRC Press, 01/Jun/2000
3) Bruyns, P.V. “Monograph of Orbea and Ballyanthus (Apocynaceae-Asclepiadoideae-Ceropegieae)” Systematic Botany Monographs 63 Pages 160 - 162. 2002
4) Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2014). "Flora of Zimbabwe: Species information: individual images: Orbea rogersii." http://www.zimbabweflora.co.zw/speciesdata/image-display.php?species_id=146730&image_id=1, retrieved 27 October 2014
Orbea rogersii Photo by: Giuseppe Distefano
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Cultivation and Propagation: Orbea rogersii is one of easiest species to grow but prone to root rot due to overwatering and lack of fresh air.
Potting medium: Since roots are quite shallow, use a gritty, very free-draining compost. Extra perlite or pumiceis suitable, and clay pots help the plants to dry out between watering.
Moisture: Water normally in the growing season, sparsely in the winter.
Spring: In the spring leaving them out in the rain may provide them with the water they need.
Summer: In the summer months they will grow well in full sun or partial shade and tolerate heavy rain, but will be just as happy if the season is dry.
Winter: It is usually recommended to over-winter them in warm conditions (at 10° C), but despite their African origins they seem to grow well and flower without the extra heat which one might have thought necessary, and occasional temperatures near 0°C (or less) are tolerated, if kept dry.
Note: Indoors only in brightest position.
Pests & diseases: It is quite resistant to the “Balck spot” disease of Asclepiads.
Propagation: Propagation is done mainly from cuttings.