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Costus Species Botanical Description Botanical Description page for GingersRus plant database number " 3597 ".
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Costus dubius

Costus dubius (Afzel.) K.Schum.



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Photo# 15199 Specimen# R0
Costus dubius tagged dallachyi at NTBG 77-059001


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Photo# 15198 Specimen# R0
Costus dubius tagged dallachyi at NTBG 77-059001


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Photo# 15220 Specimen# R0
Costus dubius compared to Costus maculatus


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Photo# 15197 Specimen# R2614
Costus dubius as sold in US


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Photo# 15196 Specimen# R2614
Costus dubius as sold in US


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Photo# 15195 Specimen# R2614
Costus dubius as sold in US - ligule


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Photo# 15219 Specimen# R2614
Costus dubius as sold in US - note one flower per bract


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Photo# 15194 Specimen# R0
Costus dubius at Marie Selby Gardens


BOTANICAL NAME: Costus dubius
SUBGENUS:Costus
GROUP:
SECTION:
PRIMARY SOURCE USED FOR DESCRIPTION:Lock - Flora of Tropical East Africa, 1985
SECONDARY SOURCES:
LAST UPDATED:
NOTES AND DISTINGUISHING CHARACTERISTICS:Description from Lock and Polhill, Flora of Tropical East Africa. Note that Lock says Koechlin's Costus albus is syn. for Costus dubius.
NATURAL DISTRIBUTION:Moist places at forest edges, 750-1250 m, through forest zone of tropical Africa westward to Sierra Leone - Cameroon, Tanzania, Uganda
HEIGHT:1 to 3 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

glabrous
sulcate

0 to 0 cm 0 to 0 mm
Ligule

glabrous
coriaceous

7 to 10 mm 0 to 0 mm
Petiole




7 to 20 mm 0 to 0 mm
Leaf



elliptic
24 to 36 cm 6 to 9 cm
...upper

ciliate margin toward apex
somewhat succulent



...under

midrib appressed pubescent, otherwise glabrous




...base



cuneate


...apex



acuminate
0 to 0 mm
Inflorescence Basal - on separate leafless shoot




0 to 0 cm 0 to 0 cm
Bract
green with purple markings, darker margins


obtuse
2.5 to 3.5 cm 1.5 to 0.0 cm
Appendage




0.0 to 0.0 cm 0.0 to 0.0 cm
Bracteole
pale green, glossy


boat, thickened toward apex
2.0 to 2.5 cm 1.0 to 1.5 cm
Flower single flower per bract
white w/ yellow center



0 to 0 cm 0 to 0 cm
Calyx
pale green
glabrous
fleshy
urceoate, 3 lobed
1.2 to 1.5 cm 0.0 to 0.0 cm
Corolla tube 1.5 cm, hairy inside
white, semi transparent


slightly hooded at apex
2.0 to 2.5 cm 0.8 to 1.0 cm
Labellum anther 7-8 mm long
white, central lemon yellow mark

thin, waivy margin
triangular, funnel shaped
2.5 to 0.0 cm 2.0 to 0.0 cm
Stamen



petaloid, eliptic, obtuse
2.0 to 2.5 cm 1.0 to 0.0 cm

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