Species of plant
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Passiflora tarminiana (or banana passionfruit) is a species of passionfruit. The yellow fruits are edible and their resemblance to small, straight bananas has given it the name banana passionfruit in some countries. It is native to the uplands of tropical South America and is now cultivated in many countries. In Hawaii and New Zealand it is now considered an invasive species. It was given the name banana passionfruit in New Zealand, where passionfruit are also prevalent. In Hawaii, it is called banana poka. In its Latin American homeland, it is known as "curuba", "curuba de Castilla", or "curuba sabanera blanca" (Colombia); "taxo", "tacso", "tagso", "tauso" (Ecuador); "parcha", "taxo" (Venezuela), "tumbo" or "curuba" (Bolivia); "tacso", "tumbo", "tumbo del norte", "trompos", "tintin, porocsho" or "purpur" (Peru).
"Passiflora tarminiana" belongs to the "Tacsonia" subgenus of "Passiflora". It has been known under a number of different names and was only formally described in 2001.
Description.
"Passiflora tarminiana" is a high climbing vine with hairy stems and petioles. Where the petioles join the stem it has stipules which are 4–7 by 2–3 mm and are soon deciduous. The leaves are three-lobed and hairy below but usually hairless above. The flowers are solitary and hang downwards. The base of the flower has pale green bracts enclosing a swollen nectary chamber. The floral tube (hypanthium) is 6–8 × 0.7–1 cm and pale green, while the sepals and petals are 3–6 cm long, pink and perpendicular to the floral tube, or reflexed. Fruits taper at both ends, are 10–14 cm long by 3.5–4.5 cm wide and ripen to yellow or light orange. The fruit contain many seeds which are embedded in an edible, orange aril.
Mollissima and its close relative "Passiflora mixta" are vines with cylindrical stems densely coated with yellow hairs, and are vigorous climbers, growing up to seven metres. The leaves are a shiny green with clearly defined veins, the flower is large, pink and green petalled with a yellow and white centre. The fruit is yellow-orange when ripe and contains a sweet edible orange-colored pulp with black seeds.
"Passiflora tarminiana" is distinguished from "P. tripartita" var. "mollissima" by a number of features. "P. tarminiana" has small deciduous stipules while "P. tripartita" var. "mollissima" has larger, persistent stipules. The sepals and petals in "P. tarminiana" are perpendicular to the floral tube or are reflexed, whereas they are never so open in "P. tripartita" var. "mollissima". They are also both much shorter in relation to the length of the floral tube in "P. tripartita" var. "mollissima" than in "P. tarminiana".
Taxonomy.
The correct taxonomic placement of this species has been problematic for some years. In South America it has been considered under "P. cumbalensis", "P. mollissima" or "P. tripartita" (the species which now includes "P. mollissima"), or as a hybrid. In Hawaii it was referred to as "P. mollissima". In New Zealand it was included under "P. mixta" although some sources also used the name "P. mollissima" for this species. It was described as a separate species distinct from any of these in 2001. The specific name recognises the Colombian agronomist Tarmín Campos.
Common names for "P. tarminiana" include banana passionfruit (Australia, New Zealand, Africa, Hawaii), "curuba India", "curuba ecuatoriana", "curuba quiteña" (Colombia), "tacso amarillo" (Ecuador), "tumbo" (Perú), "banana pōka" (Hawaii) (in the Hawaiian language the word pōka'a refers to tendrils – "that which is tied up in a ball like rope or twine"), "northern banana passionfruit" (New Zealand).
Distribution.
"Passiflora tarminiana" is native to the uplands of tropical South America but the exact native range is uncertain as it has been widely cultivated in this region. It is found in the Colombian highlands and the Venezuelan, Peruvian and southern Ecuadorean Andes where it is cultivated from around 2000 – 3000 metres. 
It has naturalised in Australia, Guam, Hawaii, New Zealand and Zimbabwe. In both Hawaii and New Zealand it is regarded as an invasive species. It is widely cultivated throughout the world, including California, Réunion, Mexico, Panama and Papua New Guinea.
"Passiflora tripartita" var. "mollissima" and "P. tarminiana" were until recently considered to be one species, "P. mollissima".
Historic use.
The banana passionfruit is native to the Andean valleys from Venezuela to Bolivia. It was domesticated and cultivated since pre-Columbian times by various cultures of western South America before the Spanish Conquest and today it is commonly cultivated and its fruit are regularly sold in local markets. The vine is grown in California as an ornamental under the name "softleaf passionflower". It is grown to some extent in Hawaii, Madeira and the State of Tamil Nadu, India.
Biology.
In the original description "Passiflora tarminina" is described as a cultigen and there is little information about its biology in the wild. Many members of the subgenus "Tacsonia" are restricted endemics and it is unclear whether the widely cultivated species (such as "P. tarminiana") are also local endemics which have been spread through widespread cultivation or whether they are naturally widespread species. The type specimen is from a cultivated rather than a wild plant.
Unlike many "Passiflora" species, "P. tarminiana" is self-compatible, although self-pollination is not considered important in the wild. The main pollinators in South America are believed to be hummingbirds or large bees, while in Hawaii birds were commonly observed robbing nectar but not transferring pollen. Bees and other insects were observed collecting pollen in Hawaii.
In Hawaii the seeds are dispersed by frugivorous animals. By far the most important disperser in Hawaii is the feral pig, which eats the fallen fruit and passes the seeds intact. Feral pigs seek out the fruit and when "P. tarminiana" occurs with feral pigs in Hawaii, the seeds are abundant in pig droppings. Germination is not enhanced by gut passage but pigs disturb the ground making a more favourable environment for germination of "P. tarminiana". Because their home range is typically one to two square miles, pigs contribute more to the peripheral expansion of "P. tarminiana" patches than long-distance dispersal.
"Passiflora tarminiana" invades both open and closed forest in Hawaii. It grows most rapidly in full sun but tolerates some shade. Growth is severely restricted at relative light intensities of less than 2%. Where the forest canopy is largely intact, "P. tarminiana" invades in canopy gaps formed when trees fall or die.
"Passiflora tarminiana" hybridises with other members of the subgenus "Tacsonia".
Uses.
"Passiflora tarminiana" is cultivated for its edible fruit. It is the second most common species in cultivation in South America after "P. tripartita" var. "mollissima" and is considered more disease resistant than that species. The fruit are also eaten in New Zealand but in Hawaii the fruit is considered to be insipid.
The pink flowers are showy and it is also considered to be an ornamental species.
Invasive species.
"Passiflora tarminiana" and "P. tripartita" thrive in the climate of New Zealand. They are invasive species since they can smother forest margins and forest regrowth. It is illegal to sell, cultivate or distribute the plants.
Banana passionfruit vines are now smothering more than of native forest on the islands of Hawaii and Kauai. Seeds are spread by feral pigs, birds and humans. The vine can also be found all across the highlands of New Guinea.
It is considered an environmental weed in South Eastern Australia (Victoria, Tasmania and New South Wales), but not declared or considered noxious by any Australian state government authorities.
Banana passionfruit is used as rootstock for grafting the passionfruit varieties more commonly grown for food, especially in climates too cool for productive passionfruit growing. Regrowth from beneath the graft is one means of its outbreak as a weed, so growers should be vigilant for sprouting low on the main stem or from around the base of the plant, and should pull up and cut back the plant when (typically after 6–9 years) the grafted passionfruit is no longer as productive.
Control.
Three biological control agents have been released in Hawaii for the control of "Passiflora tarminiana". "Septoria passiflorae", a fungus, was released in 1996. There have been major epidemics that have substantially reduced the biomass of "P. tarminiana". This fungus requires wind and rain to spread and in some areas requires repeated inoculations to achieve control. Two moth species were also introduced, "Cyanotricha necryia", which failed to establish, and "Pyrausta perelegans", which suffered substantial levels of egg parasitism and has not become common.
Physical and chemical control methods have generally proved to be ineffective and uneconomic in Hawaii, although glyphosate has been successfully used to control "P. tarminiana" in "Acacia koa" forest.
"Passiflora tarminiana" is controlled by land management agencies in some areas of New Zealand. Control is either by physical control (for example hand pulling of seedlings) or using herbicides. Biological control research is underway in New Zealand. The "Septoria" species from Hawaii was tested in containment in New Zealand and found to damage "Passiflora edulis" which is grown commercially. "Pyrausta perelegans" is undergoing host range testing.
References.
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