| Acrodon caespitosus | |
|---|---|
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Order: | Caryophyllales |
| Family: | Aizoaceae |
| Genus: | Acrodon |
| Species: | A. caespitosus |
| Binomial name | |
| Acrodon caespitosus H.E.K.Hartmann | |
Acrodon caespitosus, the Potberg tiptoothfig, is a species of mesemb from South Africa.
This succulent plant forms big and low cushion-shaped shrubs. [1] It is the biggest species in the genus, growing up to a height of 30 cm (0.98 ft) with a diameter of 60 cm (2.0 ft). [2] It has only a tap root, with no adventitious roots. [2] The internodes are long, orange-yellow and spongy and have two prominent lateral folds. [2] The triangular leaves are a deep green in colour, and are about 50 mm (2.0 in) long and 5–9 mm (0.20–0.35 in) broad and thick. Like with the plant, these are the biggest in the genus. [1] [2] There are three to twelve teeth on the keel and no teeth (or sometimes between one and three teeth) on the leaf margins. The leaf sheaths are persistent and turn black with age. [2]
Solitary flowers are borne on stems. The bracteoles reach the calyx and embrace the base of the flower. The calyx lobes are longer than the petals in younger flowers. [2] The flower has a short cone morphology, similar to those of Acrodon bellidiflorus and Acrodon subulatus . [1] The central cone has about 300 stamens with few or no filamentous staminodes. They have long basal papillae that point inwards and interweave to form a felt-like layer. [2] The 45-55 petals are white or pink with a purple stripe and purple margins. [2]
The fruits are borne above the plant on 85 mm (3.3 in) stalks. The stalks bend upwards, allowing them to receive rainwater when they are open. The capsule, with a height and diameter of about 12 mm (0.47 in) and a top of 5 mm (0.20 in), is the largest of the genus. The lens-shaped closing body splits with pressure. [2] While the long stem holding the fruit may sway due to the pressure from raindrops, wind dispersal is unlikwly as the seeds sticl together when wet. The capsule closes again when dry, reopening upon the next rain event. [2]
Acrodon caespitosus is endemic to the Western Cape of South Africa. It grows near the mouth of the Breede River, near Swellendam. [2] This area consists of shrubby coastal fynbos that receives rain all year round. [1] It grows on limestone or in sandy patches. [2]
While the risk of extinction for this species has not officially been assessed, it is known that the species living in its habitat are threatened by invasive species, including Acacia cyclops and Acacia longifolia . [1]
Howittia is a genus of plant containing the single species, Howittia trilocularis, commonly known as blue howittia, and is endemic to Australia. It is a tall shrub found growing in shaded valleys and on rainforest edges, it has hairy leaves and single, purple flowers.
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Cycnium tubulosum, also known as the vlei ink-flower and the tissue paper flower, is a slender hemiparasitic perennial plant of the broomrape family. Its range includes much of southern and eastern Africa, from South Africa to Ethiopia, including Madagascar. It has creeping, straggling or upright stems, with few narrow, entire leaves and erect, white or pinkish, slightly zygomorph flowers on a long tube, with five lobes, reminiscent of a Phlox-flower. It may not always be fully dependent on the supply of minerals by other plants, but usually makes connections with the roots of grasses. It can be found in moist, short grasslands, reaching altitudes of about 1,550 m (5,090 ft). Its conservation status in South-Africa is "least concern".
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