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Costus Species Botanical Description Botanical Description page for GingersRus plant database number " 4868 ".
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Costus albus


BOTANICAL NAME: Costus albus
SUBGENUS:
GROUP:
SECTION:
PRIMARY SOURCE USED FOR DESCRIPTION:Koechlin - Flore du Gabon, Flora du Cameroun, 1965
SECONDARY SOURCES:
LAST UPDATED:
NOTES AND DISTINGUISHING CHARACTERISTICS:KOECHLIN KEY: Plants with upright stems, with many leaves arranged along the stem, or grouped toward the top. Radical inflorescence. Leafy stem is over 1 meter high sometimes with many flowers, plants are glabrous. Flowers white, more or less marked with pink or yellow. ONE flower per bract, labellum is white, marked with yellow. Illustrated on page 69.

Similar to Costus maculatus, but has only one flower per bract instead of two, and labellum is marked with yellow in throat instead of pink. (Some C. maculatus is also marked pink.)

I believe this is a syn. for Costus dubius.
NATURAL DISTRIBUTION:Found in all parts of western and central Africa as far as Uganda.
HEIGHT:0 to 2 meters
Botanical Description for this Species
For illustrations or explanation of terminology, click on the linked plant part or column header.
Descriptions used for plant identification key are shown in BOLD.
Plant PartGeneralColorHairsTextureShape LengthWidth
Rhizome




0 to 0 cm0 to 0 cm
Sheath




0 to 0 cm 0 to 0 mm
Ligule


same as sheath
truncate
5 to 10 mm 0 to 0 mm
Petiole




0 to 0 mm 0 to 0 mm
Leaf Base of stems leafless sheaths, then normally developed leaves, lanceolate, shortly petiolate, smaller at two extremities.




0 to 25 cm 0 to 8 cm
...upper






...under






...base






...apex




0 to 0 mm
Inflorescence Basal - radical, directly from rhizome, flowering sheath of variable length (sometimes blooms terminally on leafy stem)



globulous
0 to 0 cm 0 to 4 cm
Bract
green or blotched with red



2.0 to 2.5 cm 0.0 to 0.0 cm
Appendage




0.0 to 0.0 cm 0.0 to 0.0 cm
Bracteole provided with a streamlined bracteole, lightly flaciforme and carrying a callous appendix towards the apex



carinate
0.0 to 1.8 cm 0.0 to 0.0 cm
Flower single flower per bract




0 to 0 cm 0 to 0 cm
Calyx

glabrous

3 lobed
1.0 to 1.5 cm 0.0 to 0.0 cm
Corolla
white tinged with yellow



0.0 to 0.0 cm 0.0 to 0.0 cm
Labellum
white tinged with yellow



6.0 to 7.0 cm 0.0 to 0.0 cm
Stamen




0.0 to 0.0 cm 0.0 to 0.0 cm

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