Babiana ringens

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Babiana ringens
Babiana ringens1.jpg
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Iridaceae
Genus: Babiana
Species:
B. ringens
Binomial name
Babiana ringens

Babiana ringens, the rat's tail, is a flowering plant endemic to Cape Province of South Africa. [1] The foliage is long and erect with an inflorescence consisting of a sterile main stalk adapted for ornithophily, pollination by birds. The plant bears bright red, tubular flowers on side branches close to the ground. It is a perennial that grows in nutrient-poor sandy soil [2] and flowers during the winter rains. [3]

Contents

Close view of the anthers with the stalk beside it. Babiana ringens2.jpg
Close view of the anthers with the stalk beside it.

The main stalk acts as a perch for birds, enabling birds to land within reach of the plant's flowers. The adaptation of the stalk was first noticed by Rudolf Marloth The bird that is the main pollinator of the plant is the malachite sunbird (Nectarinia famosa). [4] The male sunbird is twice as likely to perch on the stalk as the female and, on average, spends four times longer on a perch. The stalk does seem to play a role in pollination as plants without a stalk produced only half as many seeds and see less cross-pollination as plants with a stalk intact. Accessing the flower from the stalk results in pollen being dusted on the breast of the sunbirds, although the birds may also sit on the ground to access flowers that lack stalks. [5] It has been suggested that the evolution of the bare axis and the flowers being borne at the base may have been driven by selection through the action of grazing herbivores. [6]

Subspecies

Two subspecies are recorded. The nominate ringens is found north of the Fish Hoek gap while australis is found further south with the northernmost record from Scarborough.

  1. Babiana ringens subsp. australisGoldblatt & J.C.Manning
  2. Babiana ringens subsp. ringens

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Zoophily

Zoophily is a form of pollination whereby pollen is transferred by animals, usually by invertebrates but in some cases vertebrates, particularly birds and bats, but also by other animals. Zoophilous species frequently have evolved mechanisms to make themselves more appealing to the particular type of pollinator, e.g. brightly colored or scented flowers, nectar, and appealing shapes and patterns. These plant-animal relationships are often mutually beneficial because of the food source provided in exchange for pollination.

Ornithophily Pollination by birds

Ornithophily or bird pollination is the pollination of flowering plants by birds. This sometimes coevolutionary association is derived from insect pollination (entomophily) and is particularly well developed in some parts of the world, especially in the tropics, Southern Africa, and on some island chains. The association involves several distinctive plant adaptations forming a "pollination syndrome". The plants typically have colourful, often red, flowers with long tubular structures holding ample nectar and orientations of the stamen and stigma that ensure contact with the pollinator. Birds involved in ornithophily tend to be specialist nectarivores with brushy tongues and long bills, that are either capable of hovering flight or light enough to perch on the flower structures.

Pollination syndrome

Pollination syndromes are suites of flower traits that have evolved in response to natural selection imposed by different pollen vectors, which can be abiotic or biotic, such as birds, bees, flies, and so forth through a process called pollinator-mediated selection. These trait includes flower shape, size, colour, odour, reward type and amount, nectar composition, timing of flowering, etc. For example, tubular red flowers with copious nectar often attract birds; foul smelling flowers attract carrion flies or beetles, etc.

Orange-breasted sunbird Species of bird

The orange-breasted sunbird is the only member of the bird genus Anthobaphes; however, it is sometimes placed in the genus Nectarinia. This sunbird is endemic to the fynbos habitat of southwestern South Africa. They are sexually dimorphic with females being olive green while the males are orange to yellow on the underside with bright green, blue and purple on the head and neck.

Malachite sunbird Species of bird

The malachite sunbird is a small nectarivorous bird found from the highlands of Ethiopia southwards to South Africa. They pollinate many flowering plants, particularly those with long corolla tubes, in the Fynbos.

<i>Babiana stricta</i> Species of flowering plant

Babiana stricta, the baboon flower or blue freesia, is a species of flowering plant in the family Iridaceae, native to Cape Province, South Africa and naturalized in Australia. Growing 10–30 cm (4–12 in) tall by 5 cm (2 in) broad, it is a cormous perennial with hairy leaves 4–12 cm (2–5 in) long. The leaves show linear venation.

Crocoideae Subfamily of flowering plants

Crocoideae is one of the major subfamilies in the family Iridaceae.

Cyanixia is a genus of plants in the Iridaceae, first described in 2003. It contains only one known species, Cyanixia socotrana, a perennial, herbaceous and bulbous plant species endemic to the Island of Socotra in the Indian Ocean, part of the Republic of Yemen.

Miriam Phoebe de Vos South African botanist (b.1912 d.2005)

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<i>Vexatorella</i> Genus of flowering plants in the family Proteaceae endemic to the Cape Floristic Region of South Africa

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<i>Geissorhiza melanthera</i> Species of flowering plant

Geissorhiza melanthera is a small perennial plant of 14–18 cm high that is assigned to the Iridaceae. It survives the dry southern summer through storage of its resources in a corm. The stem carries two or three erect, sticky leaves of up to 18 cm (7 in) long, H-shaped in cross-section. This species blooms with six to twelve bilaterally symmetrical flowers, in a spike. Sometimes the spike has one side branch with fewer flowers. Each flower has six pale beige perianth lobes, a purple-red ring around a purple red tube and three blackish stamens. Each flower is subtended by two 1¼–2¼ cm long green bracts. This species was found flowering from the end of September till mid October. It is an endemic of the western slopes of the Piketberg mountains in the Western Cape province of South Africa.

References

  1. "World Checklist of Selected Plant Families". Kew Science.
  2. Goldblatt P, Manning JC (2007). A revision of the southern African genus Babiana, Iridaceae: Crocoideae. South African National Biodiversity Institute. Pretoria: National Botanical Institute. pp. 1–98. ISBN   978-1-919976-32-7.
  3. de Waal C, Anderson B, Barrett SC (February 2012). "The natural history of pollination and mating in bird-pollinated Babiana (Iridaceae)". Annals of Botany. 109 (3): 667–79. doi:10.1093/aob/mcr172. PMC   3278289 . PMID   21831856.
  4. Geerts S, Pauw A (2009). "Hyper-specialization for long-billed bird pollination in a guild of South African plants: the Malachite Sunbird pollination syndrome". South African Journal of Botany. 75 (4): 699–706. doi: 10.1016/j.sajb.2009.08.001 .
  5. Anderson B, Cole WW, Barrett SC (May 2005). "Botany: specialized bird perch aids cross-pollination". Nature. 435 (7038): 41–2. doi:10.1038/435041a. PMID   15875009.
  6. de Waal, C.; Barrett, S. C. H.; Anderson, B. (2012-05-21). "The effect of mammalian herbivory on inflorescence architecture in ornithophilous Babiana (Iridaceae): Implications for the evolution of a bird perch". American Journal of Botany. 99 (6): 1096–1103. doi:10.3732/ajb.1100295. ISSN   0002-9122. PMID   22615309.