This page contains photos and description of a species, form or cultivar of Costaceae.

Gingersrus Database Taxon ID 4008

Costus comosus


OLD NAME: Costus quasi-appendiculatus

NEW NAME: Costus comosus

NAME CHANGE NOTES: Costus quasi-appendiculatus proposed to become a synonym of Costus comosus.

FULL SCIENTIFIC NAME: Costus quasi-appendiculatus Woodson ex Maas

STATUS : stat. nov.

CONTINENT: Neotropical

FIELD OBSERVATIONS:(If field observations are available, you can click on the link to open in a new window.)

PHOTOS:(If photos are available, you can click on the link to open in a new window.)

SYNONYMS:


BOTANICAL NOTES:
This currently is an accepted neo-tropical Costus species described by Paul Maas as sp. nov. in 1972, but Dr. Maas has recently decided it should be included as a synonym in Costus comosus. It is a virtually unknown species, described as having a very short ligule (1-2mm), terminal inflorescence with reddish sub-appendaged bracts that are reflexed and curl down at the apex. Dr. Maas says it can also be recognized by the exposed calyx during fructification, something I have noticed in other forms of Costus comosus. The type (collected in 1939) is from the Rio Bopi near Calisaya, La Paz, Bolivia between 750 and 900 meters. For several years I have made plans to visit the region and look for this species but the political situation in Bolivia has made that impossible.

Five other collection records from Bolivia, Santa Cruz and Parque Nacional Amboro, were found in GBIF data for this species, but they are likely confused for the horticultural form of Costus comosus that is quite common there. A few other specimens are from the region of the type locality, but the only one I have found digitized is the type specimen.

No photos of the living plants of this species from the region of the Costus quasi-appendiculatus type are available. I am including on the images below a high-resolution close-up of the inflorescence from the holotype at Leiden and an isotype at NY. To me, these show a much shorter and more obtuse bract appendage than the form found further to the south in the Santa Cruz area, and certainly this is different from the plants from the north with the very long and acute bract appendages. Unfortunately, we do not have tissue available from this form to extract DNA for the molecular phylogeny.

HORTICULTURAL NOTES:


ACCESSIONS:Click links (if any) to see details of individual collections.


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Photos (if available) of Taxon ID 4008
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Costus quasi-appendiculatus holotype inflorescence - Click to see full sized image
Photo# 557 Accession# R0
Costus quasi-appendiculatus holotype inflorescence


Costus quasi-appendiculatus Krukoff10487 HOLOTYPE at Leiden - Click to see full sized image
Photo# 558 Accession# R0
Costus quasi-appendiculatus Krukoff10487 HOLOTYPE at Leiden


Costus quasi-appendiculatus Krukoff10487ISOTYPE at Kew - Click to see full sized image
Photo# 559 Accession# R0
Costus quasi-appendiculatus Krukoff10487ISOTYPE at Kew


Costus quasi-appendiculatus Krukoff10487ISOTYPE at New York Botanical Garden - Click to see full sized image
Photo# 560 Accession# R0
Costus quasi-appendiculatus Krukoff10487ISOTYPE at New York Botanical Garden


Costus quasi-appendiculatus isotype inflorescence - Click to see full sized image
Photo# 561 Accession# R0
Costus quasi-appendiculatus isotype inflorescence