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 Photo# 13149 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia |
 Photo# 13150 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia |
 Photo# 13151 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia |
 Photo# 13152 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia |
 Photo# 13153 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia |
 Photo# 13154 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia |
 Photo# 13155 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia |
 Photo# 13156 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia |
 Photo# 13157 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia |
 Photo# 13158 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia |
 Photo# 13159 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia |
 Photo# 13213 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia |
 Photo# 13214 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - bicarinate bracteole |
 Photo# 13215 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - bicarinate tubular bracteole |
 Photo# 13216 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - bracts with bracteole and calyx intact |
 Photo# 13217 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - bracts with leafy appendages |
 Photo# 13218 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - calyx |
 Photo# 13219 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - calyx |
 Photo# 13220 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - corolla lobes |
 Photo# 13221 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - detail of sheath |
 Photo# 13222 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - detail of sheath |
 Photo# 13223 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - leaf |
 Photo# 13224 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - leaf apex |
 Photo# 13225 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - root system showing root tubers and small rhizomes |
 Photo# 13226 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - root system with intermittent shoot |
 Photo# 13227 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - small bulbil at base of sheath |
 Photo# 13228 Accession# R2839 Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - stamen |
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PLANT FAMILY: Costaceae BOTANICAL NAME: Chamaecostus acaulis FORMAL SCIENTIFIC NAME: Chamaecostus acaulis (S.Moore) T.André & C.D.Specht comb. nov. STATUS :Accepted CONTINENT: Neotropical SYNONYMS: Costus subsessilis, BOTANICAL NOTES: This species is re-established as a proper name for the former Chamaecostus subsessilis plants found west of the Araguaia River basin, based on both morphology and phylogenetic research of Thiago André. Maas had placed into synonymy 11 species names and combined them ultimately into C. subsessilis, noting it to be a complex needing further study. André did extensive sampling across the geographic range and completed a phylogenetic analysis of 9 plants. He also studied the morphological traits across the range and in particular measured leaf size and angle of the base and apex of the leaves. He found there were at least two widely separated genetic lineages, one from eastern Brazil in a clade close to C. cuspidatus and the plants from western Brazil to Bolivia and southeastern Peru in a separate group. He described C. acaulis and distinguished it from C. subsessilis by having a shorter habit, and larger, broader, more puberulous leaves. He suggested that there may be some overlap between the two species, especially in the Aruguaia River basin and that geographic origin should be taken into account to assist in identification. The plant commonly found in cultivation in the USA as Chamaecostus (or Costus) subsessilis is reported to be a collection from Bolivia and it appears to be consistent with the leaf size and angles with the plants that have now been split back out to Chamaecostus acaulis. |