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Thumbnail Sheet for NeoTropical Costus Species

Thumbnail Sheet for NeoTropical Costus Species

Neotropical Costus species may be divided into four artificial (morphological) groupings for ease in identification. Some species have bracts with leafy appendages, or the bracts curve outwards to give that appearance. Other species, the bracts are non-appendaged and the inflorescence forms a tight cone.

The general shape of the flowers is another character that can be used to group neotropical Costus species. In some species the labellums close around the stamens to produce a tubular type flower. Others produce flowers with a more open labellum.

The boundaries between these four artificial groupings are not always hard and fast but can provide a very useful start in identifying a species.

The thumbnails below are divided between these four groups:

  1. Appendaged bracts, Tubular flowers
  2. Appendaged bracts, Open flowers
  3. Non-appendaged bracts, Tubular flowers
  4. Non-appendaged bracts, Open flowers

Appendaged bracts, Tubular flowers

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Costus barbatus
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Costus callosus
proposed sp. nov.

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Costus cochabambae
proposed sp. nov.

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Costus comosus
C. bakeri form

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Costus comosus
C. maritimus form



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Costus comosus
cultivated form

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Costus comosus
eastern Colombia

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Costus comosus
Panama form

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Costus cupreifolius
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Costus curvibracteatus


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Costus juruanus
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Costus lima
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Costus montanus
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Costus osae
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Costus ricus


Appendaged bracts, Open flowers

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Costus guanaiensis
(as newly det.)

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Costus asplundii
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Costus bracteatus
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Costus claviger
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Costus erythrophyllus


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Costus gibbosus
proposed sp. nov.

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Costus laevis
(as newly det.)

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Costus leucanthus
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Costus longibracteolatus
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Costus macrostrobilus


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Costus mollissimus
proposed sp. nov.

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Costus obscurus
proposed sp. nov.

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Costus pitalito
proposed sp. nov.

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Costus sinningiiflorus
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Costus sp. Chambi
proposed sp. nov.



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Costus varzearum
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Costus villosissimus

Non-appendaged bracts, Tubular flowers

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Costus alfredoi
proposed sp. nov.

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Costus alticolus
proposed sp. nov.

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Costus asteranthus
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Costus beckii
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Costus chartaceus


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Costus cordatus
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Costus dalyi
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Costus erythrocoryne
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Costus erythrothyrsus
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Costus fissicalyx


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Costus geothyrsus
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Costus lasius
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Costus nitidus
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Costus plicatus
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Costus plowmanii


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Costus prancei
proposed sp. nov.

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Costus pseudospiralis
proposed sp. nov.

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Costus pulverulentus
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Costus rubineus
proposed sp. nov.

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Costus scaber


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Costus spicatus
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Costus spiralis
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Costus stenophyllus
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Costus vargasii
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Costus weberbaueri


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Costus wilsonii
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Costus woodsonii
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Costus zingiberoides

Non-appendaged bracts, Open flowers

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Costus acreanus
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Costus allenii
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Costus alleniopsis
proposed sp. nov.

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Costus amazonicus
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Costus antioquiensis
proposed sp. nov.



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Costus arabicus
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Costus atlanticus
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Costus convexus
proposed sp. nov.

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Costus dirzoi
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Costus glaucus


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Costus krukovii
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Costus kuntzei
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Costus malortieanus
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Costus oreophilus
proposed sp. nov.

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Costus pictus
Atlantic form



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Costus pictus
Pacific form

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Costus sepacuitensis
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Costus vinosus
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Costus zamoranus

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