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Datasheet for Chamaecostus acaulis

Plant Datasheet for Chamaecostus acaulis

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Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - Click to see full sized image
Photo# 13149 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - Click to see full sized image
Photo# 13150 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - Click to see full sized image
Photo# 13151 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - Click to see full sized image
Photo# 13152 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - Click to see full sized image
Photo# 13153 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - Click to see full sized image
Photo# 13154 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - Click to see full sized image
Photo# 13155 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - Click to see full sized image
Photo# 13156 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - Click to see full sized image
Photo# 13157 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - Click to see full sized image
Photo# 13158 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - Click to see full sized image
Photo# 13159 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - Click to see full sized image
Photo# 13213 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - bicarinate bracteole - Click to see full sized image
Photo# 13214 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - bicarinate bracteole


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - bicarinate tubular bracteole - Click to see full sized image
Photo# 13215 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - bicarinate tubular bracteole


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - bracts with bracteole and calyx intact - Click to see full sized image
Photo# 13216 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - bracts with bracteole and calyx intact


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - bracts with leafy appendages - Click to see full sized image
Photo# 13217 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - bracts with leafy appendages


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - calyx - Click to see full sized image
Photo# 13218 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - calyx


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - calyx - Click to see full sized image
Photo# 13219 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - calyx


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - corolla lobes - Click to see full sized image
Photo# 13220 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - corolla lobes


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - detail of sheath - Click to see full sized image
Photo# 13221 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - detail of sheath


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - detail of sheath - Click to see full sized image
Photo# 13222 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - detail of sheath


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - leaf - Click to see full sized image
Photo# 13223 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - leaf


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - leaf apex - Click to see full sized image
Photo# 13224 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - leaf apex


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - root system showing root tubers and small rhizomes - Click to see full sized image
Photo# 13225 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - root system showing root tubers and small rhizomes


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - root system with intermittent shoot - Click to see full sized image
Photo# 13226 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - root system with intermittent shoot


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - small bulbil at base of sheath - Click to see full sized image
Photo# 13227 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - small bulbil at base of sheath


Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - stamen - Click to see full sized image
Photo# 13228 Accession# R2839
Chamaecostus acaulis (was subsessilis) cultivated plant from Bolivia - stamen



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.
Average apex angle (AA) = 61 °
Average base angle (BA) = 42 °
Leaf lengths (cm) 30.7 27.0 28.5
Leaf widths (cm) 9.0 8.6 8.5
My accession R2829 is to be renamed to Chamaecostus acaulis.

Listed on the International Plant Names Index at http://www.ipni.org/ - author listed as S.Moore

Schumann describes this species and places in subgenus Cadalvena - Das Pflanzenreich IV, 1904.

Maas in Flora Neotropica No. 8, lists this as an obsolete syn. For Costus warmingii (Costus subsessilis).


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