This page contains photos and description of a species, form or cultivar of Costaceae.

Gingersrus Database Taxon ID 3597

Costus dubius

OLD NAME: Costus dubius

NEW NAME: Costus dubius


FULL SCIENTIFIC NAME: Costus dubius (Afzel.) K.Schum.

STATUS : accepted


FIELD OBSERVATIONS:(If field observations are available, you can click on the link to open in a new window.)

PHOTOS:(If photos are available, you can click on the link to open in a new window.)

- Costus maculatus Roscoe (1825) - Costus littoralis K.Schum. (1904) - Costus albus A.Chev. (1920)

This African species is recognized in Paul Maas' monograph on African Costaceae, published on 16 December 2016. (Monograph of African Costaceae, H. Maas-van de Kamer, P.J.M. Maas, J.J. Wieringa, C.D. Specht, Blumea 61, 2016: 280 - 318,

The African Plant Database lists this as an accepted species.

There are several African species that are easily confused with each other as they are superficially similar looking. The various names and PIDs where information is stored on this website are as follows:
Costus afer -PID 3430 - 2 flowers per bract
Costus albus -PID 4868 - single flower per bract
Costus dallachyi - on tag at National Tropical Botanic Garden
Costus deistelii -PID 3754
Costus dinklagei -PID 7279
Costus dubius -PID3597 - single flower per bract
Costus maculatus -PID 3604 -2 flowers per bract
Costus megalobractea -PID 3755
These plants have also been circulated from Europeon botanical gardens originating at the Severoceska Bot. Garden in Czech Republic under the name Tapeinochilos spectabile - believed to actually be Costus maculatus.TAXONOMY NOTES BY BRIAN MIDDLEDITCH - Costus dubius (Afzel.) Schumann: Adam Afzelius named the species Zingiber dubium in 1813 (I don't know why). It was reclassified as Costus dubius in 1904 by Schumann.

Schumann describes this species and places in subgenus Eucostus - Das Pflanzenreich IV, 1904.

National Botanic Garden of Belgium (from Democratic Republic of Congo )

W3Tropicos - - CAMEROON = Specimen data: Herb 2 m high. Inflorescence from base of leafy shoot. Flower white with yellow center. TANZANIA = Specimen data: Herb ca. 1 m tall, somewhat succulent. Inflorescence borne separately from flowering stem; petals white, fleshy; one large petal tinged yellow inside; anthers white; pistil white. Common near river bank. Local name: "Jamii ya masegenya" (Kiha).

Tested for winter hardiness by Tom Wood near Gainesville, Florida - zone 8b-9, did not survive there. However, this species is known to be quite invasive spread by the seeds and is a particular problem in botanical gardens in Hawaii.

ACCESSIONS:Click links (if any) to see details of individual collections. R2614-

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Photos (if available) of Taxon ID 3597
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Costus dubius - Click to see full sized image
Photo# 617 Accession# R0
Costus dubius