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Costus Species Botanical Description Botanical Description page for GingersRus plant database number " 3436 ".
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Costus lucanusianus

Costus lucanusianus J.Braun & K.Schum.



Accession # R2850 identified as Costus lucanusianus from Le Jardin Ombragé
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Photo# 11136 Specimen# R2850
Costus lucanusianus


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Photo# 11137 Specimen# R2850
Costus lucanusianus


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Photo# 11138 Specimen# R2850
Costus lucanusianus


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Photo# 11139 Specimen# R2850
Costus lucanusianus


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Photo# 11140 Specimen# R2850
Costus lucanusianus


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Photo# 11141 Specimen# R2850
Costus lucanusianus


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Photo# 11142 Specimen# R2850
Costus lucanusianus


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Photo# 11143 Specimen# R2850
Costus lucanusianus


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Photo# 11144 Specimen# R2850
Costus lucanusianus


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Photo# 11145 Specimen# R2850
Costus lucanusianus


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Photo# 11146 Specimen# R2850
Costus lucanusianus


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Photo# 11147 Specimen# R2850
Costus lucanusianus


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Photo# 11148 Specimen# R2850
Costus lucanusianus


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Photo# 11149 Specimen# R2850
Costus lucanusianus


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Photo# 11150 Specimen# R2850
Costus lucanusianus


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Photo# 11151 Specimen# R2850
Costus lucanusianus


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Photo# 11152 Specimen# R2850
Costus lucanusianus


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Photo# 11153 Specimen# R2850
Costus lucanusianus


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Photo# 11154 Specimen# R2850
Costus lucanusianus


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Photo# 11155 Specimen# R2850
Costus lucanusianus


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Photo# 11156 Specimen# R2850
Costus lucanusianus


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Photo# 11157 Specimen# R2850
Costus lucanusianus


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Photo# 11158 Specimen# R2850
Costus lucanusianus flower


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Photo# 11159 Specimen# R2850
Costus lucanusianus flower


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Photo# 11160 Specimen# R2850
Costus lucanusianus calyx


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Photo# 11161 Specimen# R2850
Costus lucanusianus corolla lobe


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Photo# 11162 Specimen# R2850
Costus lucanusianus corolla lobe


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Photo# 11163 Specimen# R2850
Costus lucanusianus labellum


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Photo# 11164 Specimen# R2850
Costus lucanusianus stamen


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Photo# 11165 Specimen# R2850
Costus lucanusianus stamen


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Photo# 11166 Specimen# R2850
Costus lucanusianus stamen


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Photo# 11167 Specimen# R2850
Costus lucanusianus stigma


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Photo# 11168 Specimen# R2850
Costus lucanusianus labellum


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Photo# 11169 Specimen# R2850
Costus lucanusianus labellum


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Photo# 11170 Specimen# R2850
Costus lucanusianus bracts with double calyx


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Photo# 11171 Specimen# R2850
Costus lucanusianus bracts


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Photo# 11172 Specimen# R2850
Costus lucanusianus bracts


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Photo# 11173 Specimen# R2850
Costus lucanusianus bracteole


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Photo# 11174 Specimen# R2850
Costus lucanusianus bracteole


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Photo# 11175 Specimen# R2850
Costus lucanusianus calyx


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Photo# 11176 Specimen# R2850
Costus lucanusianus calyx


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Photo# 12412 Specimen# R2850
Costus lucanusianus


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Photo# 12413 Specimen# R2850
Costus lucanusianus stigma


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Photo# 12414 Specimen# R2850
Costus lucanusianus stigma


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Photo# 12415 Specimen# R2850
Costus lucanusianus stigma


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Photo# 11177 Specimen# R0
Costus lucanusianus at Fairchild Tropical Gardens, Miami, FL


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Photo# 11178 Specimen# R0
Costus lucanusianus at Fairchild Tropical Gardens, Miami, FL


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Photo# 11179 Specimen# R0
Costus lucanusianus at Fairchild Tropical Gardens, Miami, FL


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Photo# 11180 Specimen# R0
Costus lucanusianus at Fairchild Tropical Gardens, Miami, FL


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Photo# 11181 Specimen# R0
Costus lucanusianus at Fairchild Tropical Gardens, Miami, Florida


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Photo# 11182 Specimen# R0
Costus lucanusianus at Leu Gardens, Orlando, FL


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Photo# 12698 Specimen# R0
Costus lucanusianus at Waimea Audubon Center, Oahu, Hawaii


BOTANICAL NAME: Costus lucanusianus
SUBGENUS:Costus
GROUP:2-bracts not appendaged
SECTION:II-Ornithophilus
PRIMARY SOURCE USED FOR DESCRIPTION:Maas, Flora Neotropica No. 8, 1972
SECONDARY SOURCES:Koechlin - Flore du Gabon
LAST UPDATED:
NOTES AND DISTINGUISHING CHARACTERISTICS:The description below is based on Maas in Flora Neotropica. I have also compared it against the description in Koechlin's Flora of Gabon and Lock in Flora of Tropical East Africa. Maas says it can be easily distinguished from the New World Costus by the fact that each bract bears two flowers instead of one, at its axil. Costus dussi is a synonym.

Also described by Koechlin - differences noted are: height to 2-3 m, sheath to 20 mm, petiole to 20 mm, notes 2 flowers per bract, each with it's own bracteole and corolla. Labellum described as white with red margins and yellow line in middle. stamen red. Lock also mentions the "raised coriaceous ridge, with a ciliate margin, surrounding the stem at the ligule base". This is a distinguishing characteristic for this species. Lock mentions a specimen from Uganda with orange flowers and a less prominent ridge at the ligule base.

KOECHLIN'S KEY: Plants with upright stems, with many leaves arranged along the stem, or grouped toward the top. Inflorescence terminal on a leafy main stem. Bracts without appendage or only on lower bracts. Large plants, several meters high, ligule short and non-membranous. Bracts green, more or less bordered with red, each producing 2 flowers. C. lucanusianunus distinguished from C. afer by the following:
Separation at sheath-ligule marked by a thickening 'cilie' entirely surrounding the sheath.
Calyx distinctly longer than bracts
Flowers are the same as C. afer - corolla white, labellum white with red margins and a yellow central line.

There is quite a large clump of this Costus at Fairchild Gardens, which is the source for these photos. I have also heard of a yellow flowering form of Costus lucanusianus, which I believe is the idenitity of the specimen USBRG#98-229 from the Smithsonian. See photos of this plant under PID#4118
NATURAL DISTRIBUTION:Western and Central Africa (naturalized? in Martinique). Gabon (Koechlin). Also in Uganda (Lock)
HEIGHT:1 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

glabrous


0 to 0 cm 8 to 13 mm
Ligulesalient membraneous rim, fully surroundiung



truncate
1 to 2 mm 0 to 0 mm
Petiole

glabrous


5 to 20 mm 0 to 0 mm
Leaf wider than 2 cm



narrowly elliptic
12 to 26 cm 4 to 10 cm
...upper

glabrous




...under

densely sericio-puberulous




...base



rounded to slightly cordate


...apex



long acuminate
0 to 0 mm
Inflorescence terminal on a leafy stem.



globose to cylindric
4 to 7 cm 5 to 6 cm
Bract all bracts with foliaceous, green or reddish appendages, or apices of all bracts reflexed., callus 1-3 mm long
green
glabrous to sparsely puberulous toward margins
coriaceous
broadly ovate, obtuse
1.5 to 2.5 cm 1.5 to 2.5 cm
Appendage none




0.0 to 0.0 cm 0.0 to 0.0 cm
Bracteole two on each bract, callus 3 mm long
green
glabrescent

unicarinate
0.0 to 1.5 cm 0.0 to 0.0 cm
Flower




0 to 0 cm 0 to 0 cm
Calyx much longer than bracts
green
glabrescent, puberulous toward margins

lobes deltate, reflexed
1.7 to 2.0 cm 0.0 to 0.0 cm
Corolla tube 15 mm long, lobes 25 mm long
white
glabrous

narrowly elliptic
0.0 to 4.0 cm 0.0 to 0.0 cm
Labellum margins undulate
white, striped with dark purple


broadly ovate when spread
0.0 to 4.0 cm 0.0 to 0.0 cm
Stamen anther 6 mm long



narrowly elliptic
0.0 to 3.2 cm 1.0 to 1.2 cm

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