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Costus Species Botanical Description Botanical Description page for GingersRus plant database number " 3431 ".
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Costus erythrophyllus

Costus erythrophyllus Loes.



Accession # R2847 identified as Costus erythrophyllus from Le Jardin Ombragé
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Photo# 10720 Specimen# R0
Costus erythrophyllus at Atlanta Botanic Gardens plicate leaves


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Photo# 10721 Specimen# R0
Costus erythrophyllus at Atlanta Botanic Gardens smooth leaves


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Photo# 10722 Specimen# R0
Costus erythrophyllus at Leu Gardens, Orlando, FL ligules


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Photo# 10723 Specimen# R0
Costus erythrophyllus at Moody Gardens, Galveston, TX


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Photo# 10724 Specimen# R0
Costus erythrophyllus at Moody Gardens, Galveston, TX


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Photo# 12666 Specimen# R0
Costus erythrophyllus at the National Tropical Botanical Garden, Kauai, Hawaii #990326


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Photo# 10725 Specimen# R0
Costus erythrophyllus at Selby Botanical Gardens, Sarasota, FL


BOTANICAL NAME: Costus erythrophyllus
SUBGENUS:Costus
GROUP:1-bracts with appendage
SECTION:I-Costus
PRIMARY SOURCE USED FOR DESCRIPTION:Maas, Flora Neotropica No. 18, 1977
SECONDARY SOURCES:
LAST UPDATED:
NOTES AND DISTINGUISHING CHARACTERISTICS:Maas says this is distinguished from others in C. claviger group by strongly plicate leaves and unequally 2-lobed long ligule. I have seen several very similar plants identified as Costus erythrophyllus that have flat, non-plicate leaves.

The photos for PID#7300 have NOT been verified as Costus erythrophyllus. The specimen from USBRG#94-680 seems to match this description very well, and it is an unusual form with distinctive grey-green color on the adaxial side of the leaves.
NATURAL DISTRIBUTION:Amazonian Colombia, Peru, Ecuador and Brazil
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
green
glabrous


0 to 0 cm 8 to 20 mm
Ligule2 lobed unequally & deeply

glabrous


10 to 38 mm 0 to 0 mm
Petiole

glabrous


5 to 15 mm 0 to 0 mm
Leaf distinctly 6-7 plicate, scape leaves often hairy



narrowly elliptic
20 to 32 cm 8 to 11 cm
...upper
green
glabrous




...under
purplish
glabrous to sparsely puberulous




...base



cuneate


...apex



acute to acuminate
0 to 10 mm
Inflorescence Basal - on a shoot 60 cm tall with 2-7 well developed leaves



ovoid
4 to 8 cm 3 to 6 cm
Bract all bracts with foliaceous, green appendages, or apices of all bracts reflexed., callus 2-4 mm
dark red
glabrous to sparsely puberulous
coriaceous
broadly ovate
2.0 to 3.5 cm 2.0 to 3.5 cm
Appendage 25 - 60 mm by 20-40 mm
green
puberulo-villose
foliaceous
acsdending, trianbular-ovate
2.5 to 6.0 cm 2.0 to 4.0 cm
Bracteole
red
puberulous

boat shape
2.5 to 2.7 cm 0.0 to 0.0 cm
Flower




0 to 0 cm 0 to 0 cm
Calyx 11-16 mm long
red
puberulous

lobes triangular
1.1 to 1.6 cm 0.9 to 1.2 cm
Corolla 70-85 mm long
white
glabrous

tubular
7.0 to 8.5 cm 0.0 to 0.0 cm
Labellum large, spreading limb, middle lobe trilobulate, 60-65 mm
white w/central yellow zone, reddish striped


broadly ovate
6.0 to 6.5 cm 6.0 to 6.5 cm
Stamen anther 9-10 mm long
pinkish white


apex irreg. Tridentate, reflexed
4.0 to 5.0 cm 1.2 to 1.6 cm

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