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Ipomoea aquatica

(White-Flowering Kangkong)

Overview

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Vine , Climber . I. aquatica is commonly introduced by immigrants as a native herb rich in iron and with medicinal properties. However the plant is highly invasive, forming dense mats over the surface of water bodies such as lakes , ponds , marshes, canals, and ditches. It is also found in very moist soils such as the muddy banks along streams . The weed spreads rapidly from plant fragments and its floating seeds allow effective colonisation of new areas. Aquatic herbicides , whilst generally effective, are not specific enough to be used in many sensitive areas such as the Everglades , making eradication very difficult. Commonly used as a food plant in Asia (PIER , 2003). Popular among some recent immigrants as a common potherb from the homeland and has been studied in Florida as a vegetable crop . This is because the plant of its rich iron content (Langeland K .A. and Burks K.C, 1999). I. aquatica is relatively rich in S-methyl methionine (Vitamin U) and is used traditionally to treat gastric and intestinal disorders. Furthermore it has been found to have insulin-like properties acting as an anti-hyperglycaemic (Malalavidhane, Wickramasinghe and Jansz, 2000).

Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in Chuuk:

Aseri, Seeri, Seri

Common Names in English:

Akankong, Aquatic Morning Glory, Cancon, Chinese Water Spinach, Chinese Water-Spinach, Chinese Waterspinach, Cultivated Kangkong, Kang Kong, Kangkun, Kangum, Kankan, Kankum, Lili Vai, Lorenzo, Luve Ne Tombithi, Ndrinikava, Ota Karisa, Swamp morning Glory, Swamp Cabbage, Swamp Morning Glory, Swamp Morning-Glory, Swamp Morningglory, Swamp-Cabbage, Te Kang Kong, Tropical Spinach, Ung-Choi, Wa Kumala, Water Bindweed, Water Convolvulus, Water Spinach, Water-Convolvulus, Water-Spinach, White-Flowering Kangkong

Common Names in French:

Liseron D´eau, Liseron D'eau, Patate Aquatique

Common Names in German:

Wasserspinat

Common Names in Hindi:

कलमी साग, कलामी साग, पटुवा, Kalami-Sag, Kalmi, Kalmi-Sag, Kalmisag, Kalmua, Patua Saga, Patuasag

Common Names in Indonesia:

Kangkong

Common Names in Italian:

Convolvolo D´acqua, Patata Acquatica, Vilucchio D´acqua

Common Names in Khmer:

Trâkuön

Common Names in Korean:

Naphalkkotnamul

Common Names in Laotian:

Bôngz

Common Names in Malay:

Kangkong (Indonesia), Kangkung (Malaysia), Kangkung Darat (Indonesia), Kangkung Putih, Kankong, Kankung, Kankung Darat

Common Names in Malaysia:

Kangkung

Common Names in Portuguese:

Batata Aquática, Cancon

Common Names in Spanish:

Batata Acuática, Espinaca Acuática, Espinaca De Agua

Common Names in Swahili:

Mribawa Ziwa

Common Names in Tagalog:

Cancong

Common Names in Tamil:

Vallai Kirai

Common Names in Thai:

Paag Boong), Phak Bung (Pak Boong, Phak Thotyot, Phakbung Chin (Pak Boong Chin)

Common Names in Ulithi:

Kangkong

Common Names in Vietnamese:

Rau Muông

Common Names in Yapese:

Kangking, Kongkong

Description

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Family Convolvulaceae

Herbs or shrubs , usually with twining or climbing stems or erect , often with milky juice. Leaves alternate, simple , entire, dissected , or compound , absent in parasitic species. Flowers solitary, axillary or in cymes, racemes , panicles, umbels, or capitula, bisexual , actinomorphic , usually 5-merous, often showy. Sepals free , often persistent , sometimes enlarged in fruit. Corolla sympetalous , funnelform , campanulate , salverform , or urceolate ; limb subentire or deeply lobed . Stamens alternating with corolla lobes , adnate to corolla; filaments filiform , equal or unequal in length ; anthers introrse , laterally and longitudinally dehiscing; pollen smooth or finely spiny . Disc ringlike or cupular. Ovary superior, mostly 2-carpellate, 1- or 2-loculed, rarely 3- or 4-loculed; ovules basal, erect. Styles 1 or 2, terminal (gynobasic in Dichondra) or very short or absent; stigma entire or 2- (or 3) -lobed, rarely peltate. Fruit a capsule, dehiscing by valves , circumscissile, or irregularly shattering, less often a berry or nutlike. Seeds usually trigonous , smooth or pubescent .

About 58 genera and 1650 species: widely distributed in tropical , subtropical , and temperate regions ; 20 genera and 129 species in China.

Aniseia biflora (Linnaeus) Choisy and A. stenantha (Dunn) Ling, recognized in the Fl. Reipubl. Popularis Sin., are here treated as Ipomoea biflora and I. fimbriosepala, respectively, because both have pantoporate and spinulose pollen. Strictly speaking, Aniseia is a neotropical genus of about five species, of which A. martinicensis (Jacquin) Choisy is widely naturalized as a common weed in rice paddies in Thailand and other southeast Asian countries. It will probably be found in S China eventually.

The family is important in China for food plants (Ipomoea batatas (Linnaeus) Lamarck and I. aquatica Forsskål), several ornamentals (Ipomoea), several medicinal plants (Erycibe, Ipomoea, Cuscuta, Merremia, Dichondra, Evolvulus), and numerous noxious weeds (Cuscuta, Calystegia, Convolvulus) .

Pollen aperture type and surface ornamentation are important characters in the classification of Convolvulaceae at the generic level and above. The most critical feature of the pollen is whether the grain surface is spiny or not. This distinction separates the eight tribes recognized by Austin (Ann. Missouri Bot. Gard. 60: 306-412. 1973) into two rather cohesive groups. A low magnification (20 ) is adequate for discerning the presence or absence of minute spines on the surface.

For the successful identification of Convolvulaceae, both flowering and fruiting material should be collected. The first key to genera requires adequate fertile material with both flowers and fruit, and requires use of a pollen character. The second key may be used as an aid to identification where material is lacking flowers or fruit, but in some instances it is still partially dependent upon having both flowers and fruit.[1]

Genus Ipomoea

Herbs or shrubs , often twining , sometimes prostrate , erect , or floating. Leaves petiolate , entire, lobed , or divided . Inflorescences mostly axillary , cymose , 1- to many flowered, rarely paniculate ; bracts various. Flowers small to large. Sepals persistent , equal to unequal, ± enlarged in fruit. Corolla variously colored , rarely yellow, funnelform , campanulate , or salverform ; limb 5-lobed to entire, midpetaline bands well defined. Stamens included or exserted; filaments filiform , usually unequal, dilated and pubescent basally; anthers ovate or linear , longitudinally dehiscent , not twisted; pollen globular, pantoporate , finely spiny . Disc ringlike. Ovary 2-4-loculed, 4- or 6-ovuled. Style 1, filiform, included or exserted; stigma capitate, or 2- or 3-globulose. Capsule globose or ovoid , 4- or 6-valved. Seeds 4(-6) or fewer, glabrous or pubescent.

Approximately 500 species: widely distributed in tropical to warm temperate regions , especially of North and South America; 29 species in China.[2]

Physical Description

Species Ipomoea aquatica

Herbs annual , terrestrial and repent or floating; axial parts glabrous . Stems terete , thick, hollow, rooting at nodes. Petiole 3-14 cm, glabrous; leaf blade variable, ovate , ovate-lanceolate, oblong , or lanceolate, 3.5-17 X 0.9-8.5 cm, glabrous or rarely pilose , base cordate, sagittate or hastate, occasionally truncate , margin entire or undulate , apex acute or acuminate. Inflorescences 1-3(-5) -flowered; peduncle 1.5-9 cm, base pubescent; bracts squamiform , 1.5-2 mm. Pedicel 1.5-5 cm. Sepals subequal , glabrous; outer 2 ovate-oblong, 7-8 mm, margin whitish, thin, apex obtuse , mucronulate ; inner 3 ovate-elliptic, ca. 8 mm. Corolla white, pink, or lilac, with a darker center, funnelform , 3.5-5 cm, glabrous. Stamens unequal, included . Pistil included; ovary conical , glabrous. Stigma 2-lobed. Capsule ovoid to globose , ca. 1 cm in diam., woody, tardily dehiscent or ?indehiscent. Seeds densely grayish pubescent , sometimes glabrous. 2n = 30*. [source]

Habit: Vine , Forb/herb

Flowers: Flower Color: lavender, near white, pink, violet, white

Size/Age/Growth

Size: 8-10' tall.

Habitat

Marshy habitats : ditches, ponds , rice paddies, waste areas[3].

I. aquatica is found in fresh water aquatic habitats (PIER , 2003). I. aquatica has been found primarily in canals and ditches but also invades lakes . It grows well in moist soil or in still to flowing waters (Langeland K .A. and Burks K.C, 1999). I. aquatica dwells in muddy stream banks, freshwater pond and lakes, and marshes. It is confined to the tropics and subtropics zones because it is susceptible to frosts and because it does not grow well when temperatures are below 23.9 degrees Celsius. Because of its prolific growth, this species can invade moist cultivated areas, such as rice and sugar cane fields , and other areas with varying water levels (Fears, UNDATED).

Typically found at an altitude of 0 to 1,541 meters (0 to 5,056 feet).[4]

Biome: lakes , riparian zones, water courses , wetlands

Ecology: I. aquatica forms dense floating mats of intertwined stems over water surfaces, shading out native submersed plants and competing with native emergents. It is considered the second greatest problem plant in the Philippines, where it tends to overgrow freshwater marginal areas. A common to serious weed in many areas in the tropics (Langeland K .A. and Burks K.C, 1999). Masses of tangled vegetation obstruct water flow in drainage and flood control canals. They have infested lakes , ponds , and river shorelines , displacing native plants that are important for fish and wildlife. The veins of the plant create dense impenetrable canopies over small ponds and retention basins creating stagnant water conditions that are ideal breeding environments for mosquitoes (Fears, UNDATED).

Biology

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Reproduction

Under good conditions, I. aquatica can produce 190,000 kg fresh weight biomass per ha in 9 months. It flowers in the warm months and produces 175-245 seeds per plant during the peak season (Langeland K .A. and Burks K.C, 1999).

Duration: Perennial

Growth

Culture: Space 6-8' apart.

Sunlight: Sun Exposure: Full Sun .

Temperature: Cold Hardiness: 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b, 11. (map)

Taxonomy

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Unambiguous Synonyms

  1. Dendrocopos nuttalli (Gambel, 1843)
  2. Dendrocopos nuttallii (Gambel, 1843)


Notes

Name Status: Accepted Name . Latest taxonomic scrutiny: 15-Mar-2000

Name verified on

Place of publication : Fl. aegypt.-arab. 44. 1775

Name verified on 02-Sep-1992 by ARS Systematic Botanists. Last updated: 21-Jul-2000

Similar Species

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Members of the genus Ipomoea

ZipcodeZoo has pages for 1572 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them:

I. abrupta (Bush Yam) · I. abscissa · I. abutilodes · I. abutilodes var. hartwegiana · I. abutilodes var. kunthiana · I. abutiloides · I. abyssinica · I. acanthocarpa · I. acaponetensis · I. acetosaefolia · I. acetosaefolia var. longifolia · I. acetosellaefolia · I. acetosellifolia · I. acetosifolia · I. aculeata · I. aculeata var. heterophylla · I. acuminata · I. acuminata 'Blue Dawn' (Blue Dawn Morning Glory) · I. acutangula · I. acutiflora · I. acutisepala · I. adenioides (Trumpet Flower Morning Glory) · I. adumbrata · I. aegopoda · I. aegyptia · I. aequisepala · I. affinis · I. afra · I. afzelii · I. aitoni · I. aitonii · I. 'Akatsuki no Hikari' (Morning Glory) · I. 'Akatsuki No Murasaki' · I. alata · I. alatipes · I. alba (Tropical White Morning-Glory) · I. alba 'Giant White' · I. alba 'Meekerii' (Moonflower) · I. albidiflora · I. albiflora · I. albivenia (Wild Cotton) · I. alexandrae · I. alpina · I. alterniflora · I. althoffiana · I. altissima · I. alulata · I. amambayensis · I. ambigua · I. amnicola (Red-Center Morning-Glory) · I. amoena · I. amoenula · I. ampamana · I. amparoana · I. ampelopsifolia · I. amplexicaulis · I. ampliata · I. ampullacea (Ipomoea) · I. anceps · I. ancisa · I. andersonii (Morning Glory) · I. andongensis · I. androyensis · I. anemophoba · I. angularis · I. angulata · I. angulata var. gnidoides · I. angulata var. latifolia · I. angulata var. linearis · I. angustata · I. angustifolia · I. angustisecta · I. angustisepala · I. anisomeres · I. anisomeres var. sagittiformis · I. antillana · I. antonschmidii · I. aphylla · I. apiculata · I. aprica · I. aquatica (White-Flowering Kangkong) · I. arachnoidea · I. arachnosperma (Ipomoea) · I. arborea · I. arborescens (Tree Morning Glory) · I. arborescens var. pachylutea · I. arenaria · I. arenicola · I. argentaurata · I. argentea · I. argentifolia · I. argentina · I. argentinensis · I. argentinica · I. argillicola (Ipomoea) · I. argyreia · I. argyreioides · I. argyrophylla · I. aristolochiaefolia · I. aristolochiifolia

More Info

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Further Reading

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  • Fang Rhui-cheng & Huang Shu-hua in Wu Cheng-yih, ed. 1979. Convolvulaceae. Fl. Reipubl. Popularis Sin. 64(1): 1-153.

    • Notes

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    Contributors

    Data Sources

    Accessed through GBIF Data Portal December 10, 2007:

    Identifiers

    Footnotes

    1. Ruizheng Fang & George Staples "Convolvulaceae". in Flora of China Vol. 16 Page 271. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
    2. Clifton E. Nauman "Ipomoea". in Flora of China Vol. 16 Page 301. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
    3. "Ipomoea aquatica". in Flora of China Vol. 16 Page 307. Missouri Botanical Garden Press. Online at EFloras.org. [back]
    4. Mean = 126.860 meters (416.207 feet), Standard Deviation = 1,052.550 based on 93 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
    Last Revised: 2009-09-14