Barclays longifolia

Wallich (1827)

Family: Nymphaeaceae. Synonyms: Hydrostemma longifolium (Wallich), Mabberley, Barclaya pierreana Gagne-pain, B. oblonga Wall and others. Etymology: Barclaya-. after the English botanist Robert Barclay (1751-1830); longifolia: with long leaves.

Distribution: Burma, Andaman Islands, southern Thailand, India, Sumatra, New Guinea.

Description: Aquatic plant with a tuberous or up to 6-cm long, thin, fleshy rhizome. Leaves in a rosette, 3-10(—20) cm petiolate. Leaf blade oblong, thin, 10-25(-35) cm long, 2-5(—10) cm wide, glabrous on the upperside, slightly mammilate on the underside. Juveniles with a round base, adults deep cordate to slightly hastate. Margin undulate. A red and a green variety are in culture, for which the author hereby introduces the cultivar names 'Red' and 'Green'. In the more frequent 'Red' cultivar, the leaf uppersides are wine red to brownish red, and the underside is light violet; in the rare 'Green' cultivar, they are olive green upperside and light violet on the underside.

Pedicel up to 50 cm long; 5 sepals; 7-10 petals in 2-3 circles, only free in the upper part, olive green on the outside, purple-red to dark violet on the inside. Sterile stamens in about 2 rows, fertile, free stamens arranged in 3-6(—7) rows. Ovaries inferior; (8—)10-12(—14) carpels, radiate, their continuation adnate to a "disc," these are free at the end so pollen can fall onto the carpels through the opening to the top (refer also to Stengel 1982/83). Fruit a berry with up to 300 about 1 mm globular brownish seeds, which are densely covered with long white spines. Fruit flesh initially slimy, sticky and glazed, on maturity solid, white to slightly pink. Culture: A magnificent and demanding but recommendable aquarium plant which is best maintained in soft to medium-hard, acid water at temperatures of 25-28 °C. Also recommended is a nutrient-rich substrate (clay additive). Light is less important, but the plants must not be placed in too dark a location. The tender leaves are a welcome food for snails, so care must be taken. After a period of good growth and ample flowering, Barclaya will usually retreat in development, but will grow again after a few weeks. Under good cultivation conditions a plant may survive several of

Barclaya longifolia 'Green'.

Barclaya longifolia 'Red'.

Barclaya longifolia 'Green'.

Barclaya longifolia 'Red'.

Barclaya Longifolia Rot Bilder

such periods; new plants should nevertheless again be reared from seeds. If a lower, slower growth is desired in aquariums, it is recommended to set the plants into pots which are then inserted into the substrate. Growth will then proceed much slower and the plants will remain small for a longer period. Large specimens of Barclaya longifolia can be used as solitary plants; smaller plants can temporarily be terraced as a grouping.

Sexual propagation using seeds is very productive. Flowers will often develop under water in aquariums and will rarely open, but will nevertheless produce seeds (cleisto-gamy). After a maturing period of about seven weeks, the fruit will rot away and release the seed. It should be left to germinate under a lot of light because, under such conditions, the germination quota will usually be very high. The young plants are reared in a low-set aquarium under good lighting conditions. Initially they will grow quickly, but often a cessation in growth will occur after a couple of weeks. This difficult phase can best be bridged if the plants are then transferred. Barclaya longifolia generally handles the

Transversa! section through a flower of

B. longifolia.

Transversa! section through a flower of

B. longifolia.

Barclaya Longifolia

transfer well and often subsequently "rewards" the change in environment with even further improved growth. A transfer should, however, not take place during the resting period. The plants will be ready to flower again after only 1 year. The rare, green-colored form can also develop excellently in the aquarium. It remains a little smaller, however.

Ecology: According to Bader (1992), B. longifolia usually grows in loose to dense populations in sunny and semishady places in rapid-flowing, predominantly clear streams carrying soft, acid water. The substrate was sandy-loamy.

Other: The name of the genus Barclaya is a nomen conservandum (conserved name) and therefore takes priority over the older genus name Hydrostemma.

Transversal section through a fruit of

B. longifolia.

Transversal section through a fruit of

B. longifolia.

Barclaya Longifolia
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Responses

  • GAUDENZIA
    How to barclaya longifolia seeding?
    6 years ago

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