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SPECIMEN DESCRIPTION

This is a detailed botanical description of plant specimen(s) for this species measured and photographed.

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Photo# 15377 Specimen# R3031
Costus comosus cultivated form known as barbatus


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Photo# 15378 Specimen# R3031
Costus comosus cultivated form known as barbatus- bract and flower


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Photo# 15379 Specimen# R3031
Costus comosus cultivated form known as barbatus - bract and bracteole


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Photo# 15380 Specimen# R3031
Costus comosus cultivated form known as barbatus - bracteole


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Photo# 15381 Specimen# R3031
Costus comosus cultivated form known as barbatus - - bract (note margins not fibrous)


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Photo# 15382 Specimen# R3031
Costus comosus cultivated form known as barbatus - flower with calyx


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Photo# 15383 Specimen# R3031
Costus comosus cultivated form known as barbatus - calyx and style


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Photo# 15384 Specimen# R3031
Costus comosus cultivated form known as barbatus - corolla lobes


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Photo# 15385 Specimen# R3031
Costus comosus cultivated form known as barbatus - stamen


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Photo# 15386 Specimen# R3031
Costus comosus cultivated form known as barbatus- labellum


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Photo# 15387 Specimen# R3031
Costus comosus cultivated form known as barbatus - labellum


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Photo# 15388 Specimen# R3031
Costus comosus cultivated form known as barbatus


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Photo# 15389 Specimen# R3031
Costus comosus cultivated form known as barbatus



ACCESSION #:
R3031

IDENTIFIED AS:
Costus comosus var. bakeri, a/k/a C. barbatus in

LOCATION:
Le Jardin Ombragé

SOURCE:
In horticulture, origin unknown.

DETERMINATION:
By Dave Skinner, Dr. Chelsea Specht and others. This plant, common in horticulture as Costus barbatus, is actually Costus comosus. In Australia, it is often identified correctly as Costus comosus. The ligules are short and truncate (barbatus is long and lobed) and the margins of the bracts are entire whereas C. barbatus is described as having distinctively fibrous margins to the bracts, bracteoles and calyx. I have never seen the true Costus barbatus. I am placing this plant in C. comosus var. bakeri instead of var. comosus due to mostly glabrous upper side of leaves and scabrid bracts.

GENERAL:
Medium to tall plant, non-descript green leaves like many other Costus species, produces showy red-bracted inflorescence in spring (if plant kept evergreen) that continues to grow longer and longer throughout the growing seaon, and produces contrasting yellow tubular flowers from the topmost bracts.

RHIZOME :


SHEATH:
Green with darker brownish bands, 20-23 mm in diameter, pubescent.

LIGULE:
Short, truncate, less than 5 mm long, pubescent.

PETIOLE:
Very short, about 2 mm long, pubescent.

LEAVES:
Medium green upper and lower surface, upper glabrous, lower pubescent, 34-38 cm long and 11 cm wide, base somewhat cordate, apex acute to shortly acuminate.

INFLORESCENCE:
Terminal on a leafy stem (rarely basal on separate shoot). Large showy inflorescence, bright red patent bracts and bright yellow tubular contrasting flowers.

BRACTS:
Dark cherry red, pubescent, 4 cm long including appendage and 2.5 cm wide.

APPENDAGE:
Triangular appendage same color as bracts, recurved outwards.

BRACTEOLE:
Dark red, pubescent, boat shaped, 2.5 cm long and 0.8 cm wide.

CALYX:
Dark red, pubescent, three lobed, lobes acute with one side cut deep, 2 cm long and 1 cm wide.

COROLLA:
Yellow, pubescent, lobes 4 cm long, dorsal lobe 2 cm wide and acuminate, other lobes 1.5 cm wide.

LABELLUM:
Yellow, glabrous, apex incised, 4 cm long and tube 1 cm in diameter.

STAMEN:
Yellow, glabrous, apex entire, 4 cm long and 0.8 cm wide.

STIGMA:


OTHER:


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