Cryptocoryne nurii Furtado

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View on the Kahang river in Johore. The dark patches in the water are pure stands of C. nurii
photo Bastmeijer
It is easy to walk in the river bed during the dry season (end of May) and collect some plants.
photo Bastmeijer
The collected plants are almost black, 25 cm (10") long and have narrow ovate leaves with an undulated margin. No inflorescences were found.
photo Bastmeijer
In emersed cultivation, this plant is much smaller and also the spathe has a short tube. See for details of the limb below.
photo Eichner
A small jungle stream in Johore with very slow running water. Thousands of C. nurii (and lot of leeches).
photo Bastmeijer
The leaves are brownish and wider compared to these from the Kahang river.
photo Bastmeijer
Before the limb opens, the spathe shows the typical formed bud.
photo Bastmeijer
Only a few C. nurii were flowering in the stream. Note the rough surface of the limb.The width of the limb is c. 2.5 cm (1").
photo Bastmeijer
Jacobsen collected C. nurii near Mersing in the state of Johore. This is a very typical picture of the spathe of C. nurii.
photo Jacobsen
This C. nurii is collected by Jacobsen in the south of the Pahang state. The plants were up to 40 cm (16") long.
photo Jacobsen
This plant with a yellow limb of the spathe and the pallid nerves on the leaf, is found by Peter Boyce in the Taman Negara F.R.(Pahang).
photo Boyce
Close up of the limb of the plant from the Kahang river (Johore). Note the irregular outgrows (protuberances)
photo Eichner
A wide stream near Mersing (Johore) with C. nurii growing submersed. The leaves often have pallid veins and transverse markings. Sometimes they show some red dots.
photo Waser
A emersed cultivated C. nurii. The plant is very tiny, as is the spathe. Compared to C. minima, the limb has a pronounced cordate base,  stands more or less horizontal and has a small tail.
photo Bastmeijer
In emersed culture, the leaves may show a different colored venation. This plant was very weak and did not survive for a long time. The ruler displays cm.
photo Bastmeijer
Opened kettle of C. nurii. It is a bit abnormal in showing some male flowers halfway the spadix. This is occasionally seen in many species. The number of the male flowers is rather low.
photo Bastmeijer
Van Wijngaarden discovered a somewhat deviating form of C. nurii in an import shipment. Note typical bud of the inflorescence.
photo van Wijngaarden
The leaves are brownish marmorated. The limb of the spathe shows the typical structure with the irregular  protuberances.
photo van Wijngaarden
The same plant seen from the front. Although the limb of the spathe is less cordate, it must be regarded as C. nurii.
photo van Wijngaarden
In the same shipment were other plants found which showed a yellow limb of the spathe
photo van Wijngaarden
A normal developed kettle of C. nurii. Note the reddish hue on the upper side of the kettle.
photo van Wijngaarden
Type of C. nurii collected by Nur in 1928. Note the very long tube of the spathe
herbarium Singapore
Drawing of C. nurii in de Wit (1990). The opened kettle is probably of a submersed grown spathe (rather long). Note the surface of the limb.
drawing Ike Zewald
Distribution of C. nurii in West Malaysia. In the south are the 'classical' localities in the state Johore. The other are found in the state of Pahang.

Cryptocoryne nurii grows in West Malaysia in Johore and in Pahang on several places. It is often collected and is exported in thousands. However, this plant is extremely difficult to cultivate over a long time.
Furtado (1935) describes a plant with leaves up to 35 cm and a spathe with a tube up to 12 cm. As special feature he mentions a peduncle of the spathe of about 10 cm. Apparently he described a submersed grown plant. In emersed culture, all parts are much smaller, the spathe not exceeding 5 cm.
Imported non flowering plants of C. nurii can sometimes be recognized by some red spots, mainly on the main nerve of the blade. Rataj & Horemann (1977) give a nice picture of this mark. But this feature is not always present. C. nurii shows some variation both in the spathe and in the leaves. More collections are wanted, especially from the central and northern parts of W. Malaysia. The C. sp. ('serrulated leaves') is probably also a form of  to C. nurii.

Updated January 2001

Literature:

Arends, J.C., Bastmeijer, J.D. & Jacobsen, N., 1982, Chromosome numbers and taxonomy in Cryptocoryne (Araceae).II., Nord.J.Bot. 2 : 453-463.
Furtado, C.X., 1935, Araceae Malesicae, Gardens Bull.of the Straits Settlem. 8 : 145-148.
Jacobsen, N., 1982, Cryptocorynen, Alfred Kernen Verlag, Stuttgart.
Jacobsen, N. & J.Bogner, 1987, Die Cryptocorynen der Malaiischen Halbinsel (2.Teil), Aqua-Planta 1-87 : 13-20.
Kasselmann, C., 1995, Aquarienpflanzen, Ulmer, Stuttgart.
Rataj, K. & Horeman, T.J., 1977, Aquarium Plants, TFH Publ, USA.
Roe, C.D., 1967, A manual of aquarium plants, Shirley aquatics Ltd.
Sadilek, V., 1968, Neue Cryptocorynen III : Cryptocoryne nurii Furtado, DATZ 21: 18-20.
Sadilek, V., 1981, Sind die malayischen Cryptocorynen Problempflanzen ?, Aqua-Planta 3-81 : 76-78.
Schulze, J., 1967, Beobachtungen über Wasserpflanzen in einigen südostasiatischen Ländern I-IV, DATZ 20 : 211-215, 248-252, 279-282, 312-314.
Wit, H.C.D. de, 1990, Aquarienpflanzen, 2. Auflage, Ulmer, Stuttgart.