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Costus Species Botanical Description Botanical Description page for GingersRus plant database number " 4034 ".
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Costus acreanus

Costus acreanus (Loes.) Maas



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Photo# 15844 Specimen# R0
Costus acreanus, Plowman et al 2298, Colombia, Leticia - note it has appendaged bracts as does the illustration but contrary to description.


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Photo# 17528 Specimen# R0
Costus acreanus - the illustration in Maas' monograph shows appendaged bracts on full inflorescence, non-appendaged bracts in illustration part"e". Description and type specimen appears to have non-appendaged bracts.


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Photo# 15845 Specimen# R0
Costus acreanus, Plowman 5011, Peru, near Pilcopata (Manu area)


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Photo# 15846 Specimen# R0
Costus acreanus, Foster 6579, from Peru, Rio Manu, Cocha Cashu Station


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Photo# 15847 Specimen# R0
Costus acreanus, Duarte #7146 - Herbarium at Jardim Botanico


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Photo# 15848 Specimen# R0
Costus acreanus, Duarte #7146 - Herbarium at Jardim Botanico


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Photo# 15849 Specimen# R0
Costus acreanus, Duarte #7146 - Herbarium at Jardim Botanico


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Photo# 15850 Specimen# R0
Costus acreanus, Duarte #7144 - Herbarium at Jardim Botanico


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Photo# 15851 Specimen# R0
Costus acreanus, Duarte #7144 - Herbarium at Jardim Botanico


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Photo# 15852 Specimen# R0
Costus acreanus, Duarte #7144 - Herbarium at Jardim Botanico


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Photo# 15853 Specimen# R0
Costus acreanus, Duarte #7144 - Herbarium at Jardim Botanico


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Photo# 15854 Specimen# R0
Costus acreanus, Duarte #7144 - Herbarium at Jardim Botanico


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Photo# 15855 Specimen# R0
Costus acreanus, Duarte #7144 - Herbarium at Jardim Botanico


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Photo# 15856 Specimen# R0
Costus acreanus, Duarte #7144 - Herbarium at Jardim Botanico


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Photo# 15857 Specimen# R0
Costus acreanus, Daly et al #9990 - Herbarium at Jardim Botanico


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Photo# 15858 Specimen# R0
Costus acreanus, Daly et al #9990 - Herbarium at Jardim Botanico


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Photo# 15859 Specimen# R0
Costus acreanus, Daly et al #9990 - Herbarium at Jardim Botanico


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Photo# 15860 Specimen# R0
Costus acreanus, Daly et al #9990 - Herbarium at Jardim Botanico


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Photo# 17529 Specimen# R0
Costus acreanus specimen from Los Amigos, Madre de Dios, Peru (BRIT)


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Photo# 17530 Specimen# R0
Costus acreanus lectotype specimen at Kew Gardens, collected by Ule in 1911 along the Rio Acre in Peru near the border with BoliviaandBrazil.


BOTANICAL NAME: Costus acreanus
SUBGENUS:Costus
GROUP:2-bracts not appendaged
SECTION:I-Costus
PRIMARY SOURCE USED FOR DESCRIPTION:Maas, Flora Neotropica No. 8, 1972
SECONDARY SOURCES:
LAST UPDATED:
NOTES AND DISTINGUISHING CHARACTERISTICS:This species is closest to C. laevis, but has velutinous bracts, bracteoles, calyx and corolla, and the calyx is longer than that of C. laevis. Evidently Maas did not see the inflorescence in living material, but described colors based on report by Ule. In Monograph No. 18, he modified the description. These changes are included on the chart below. He also reported a probable natural hybrid with C. guanaiensis var. guanaiensis found in Brazil, with hirsute stems and bracts, some of them appendaged. Inflo. photographed in No. 18, page 182.

More on this species on the datasheet and more photographs to be loaded soon.
NATURAL DISTRIBUTION:marshes, varzea forests and on low hills to 700m, sw Brazil and adjacent Peru - also in Columbia.
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 or sparsely minutely puberulous


0 to 0 cm 5 to 20 mm
Liguleshort, 1-15 mm

sparsely to densely minutely puberulous

truncate
1 to 9 mm 0 to 0 mm
Petiole

sparsely to densely minutely puberulo-velutinous


1 to 10 mm 0 to 0 mm
Leaf



narrowly elliptic
12 to 45 cm 6 to 16 cm
...upper
greyish-green
glabrous, sparsely strigulose costa




...under
often purplish
glabrous to densely minutely puberulous




...base



cuneate to rounded


...apex



shortly acuminate
0 to 0 mm
Inflorescence Either terminal on a separate leafless shoot or on a leafy stem.



ovoid, obtuse or acute
4 to 12 cm 3 to 7 cm
Bract velutinous, callus 5-11 mm
green (exposed part), or purplish?
densely velutinous
thick, coriaceous
broadly ovate triangular
3.5 to 6.0 cm 2.0 to 3.5 cm
Appendage none




0.0 to 0.0 cm 0.0 to 0.0 cm
Bracteole

densely velutinous


2.7 to 3.1 cm 0.0 to 0.0 cm
Flower




0 to 0 cm 0 to 0 cm
Calyx 16-22 mm long

densely velutinous

lobes deltate to triangular
1.7 to 2.2 cm 0.0 to 0.0 cm
Corolla tube 25 mm long, lobes densely velutinous and with 2-5 mm acumen
white to pink
glabrous


6.5 to 10.0 cm 0.0 to 2.8 cm
Labellum #18=white, slightly tinged with yellow and purple in throat
white, slightly tinged with yellow & red


broadly ovate
5.0 to 7.5 cm 7.5 to 9.0 cm
Stamen anther 10 mm
white, apex pinkish



4.5 to 5.5 cm 1.5 to 1.7 cm

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