Cryptocoryne scurrilis de Wit

C. scurrilis originates from the Riau province in Sumatra (Indonesia) where the Dutch botanist Meijer found it in 1956 in the upper part of the Indragiri River. In April 2009, Kazuya Nakamoto recollected the plant and it proved to be easy to cultivate the plant in an acid substrate.

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Habitat of C. scurrilis in a small stream flowing towards a tributary of the Indragiri river...
photo Nakamoto
...where it grows half shaded, in shallow water, pH 5-6.
photo Nakamoto
Parts of the stream may seasonally dry out, the plants will survive.
photo Nakamoto
Note the fine sandy bottom. Better do not imitate this for cultivation.
photo Nakamoto
Habitat      
The limb of the spathe. Note the pronounced and elevated collar.
photo Nakamoto
Cultivated in acid beech tree leaf litter...
coll. KN IIU-02, cult. NJ
photo Jacobsen
...where it multiplies (too) fast. The leaves become smaller and more brownish.
coll. KN IIU-01, cult. B 1282
When settled, it flowers abundantly.
coll. KN IIU-01, cult. B 1282
       
Note again the typical elevated, somewhat asymmetrical collar.
coll. KN IIU-01, cult. B 1282
The limb of the spathe is spread horizontal after opening...
coll. KN IIU-01, cult. B 1282
... and soon the tip will bend down...
coll. KN IIU-01, cult. B 1282
... and finally the whole limb, almost resembling C. minima.
coll. KN IIU-01, cult. B 1282
       
Opened kettle of C. scurrilis. Note the long styles and stigma's. The spadix is pulled away from behind the flap
coll. KN IIU-01, cult. SR 328
photo Reitel
Another opened kettle. Note the attachment of the top of the spadix on the left side. Left and right handedness is a normal variation in Cryptocoryne.
coll. KN IIU-01, cult. B 1282
A close up of the male flowers. The pollen drops are already visible.
coll. KN IIU-01, cult. B 1282
A close up of the female flowers
coll. KN IIU-01, cult. B 1282
       
The original drawing of C. scurrilis in De Wit (1962, 1990) with the legends by Ike Zewald. Figures 4 and 5 refer to C. bangkaensis.
Courtesy herbarium WAG.

drawing Ike Zewald
One of the two sheets Meijer 4313 of C. scurrilis in the Leiden herbarium (L). Only one plant (top left) has an immature spathe left. No fruits are present.
coll. Meijer 4313
Close up of the herbarium sheet (left) with the immature spathe.
coll. Meijer 4313
Distribution of C. scurrilis in Sumatra (Indonesia).
       

Cultivation
Despite of it's habitat, it is far more easy to grow C. scurrilis in a loose substrate of acid leaf litter, emerged in pots or half submerged in a simple plastic container, see Reitel et al. in the references.

Note. The naming of this plant has a quite complicated history. See under C. bangkaensis. Nakamoto's rediscovery is without doubt the C. scurrilis that Meijer found in 1956 but on the other hand a lot of new plants are found in Sumatra which are more or less intermediate between this plant and C. nurii. Also a number of (natural) hybrids are encountered, making the picture even more complicated. The story will be continued.

Updated November 2012

Literature:

Bastmeijer, J.D. & N. Jacobsen, 2007, Cryptocoryne bangkaensis Bastmeijer, ein neuer Name für eine gut bekannte Cryptocoryne von Sumatra (Indonesien). Aqua-Planta 32(2): 41, 44-55 (Document service).
Nakamoto, K., 2012, http://cryptoandbetta.blogspot.nl/search/label/C. scurrilis
Reitel, S., K. Nakamoto & J.D.Bastmeijer, 2012, Die echte Cryptocoryne scurrilis de Wit (Araceae), Aqua-Planta 37(4): 135-142 (Document service).
Wang T.S., 2012, http://illumbomb.blogspot.com/search/label/C. scurrilis
Wit, H.C.D.de, 1962, Nieuwe waterplanten, Meded.Bot tuinen en het Belmonte arboretum WAG Vol VI-4 : 92-98.
Wit, H.C.D.de, 1990, Aquarienpflanzen, 2. Auflage, Ulmer, Stuttgart.