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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# 13263 Specimen# R2974
Cheilocostus/Hellenia lacerus Smithsonian #2001-073


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Photo# 13264 Specimen# R2974
Cheilocostus/Hellenia lacerus Smithsonian #2001-073


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Photo# 13265 Specimen# R2974
Cheilocostus/Hellenia lacerus Smithsonian #2001-073


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Photo# 13266 Specimen# R2974
Cheilocostus/Hellenia lacerus Smithsonian #2001-073


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Photo# 13327 Specimen# R2974
Cheilocostus/Hellenia lacerus Smithsonian #2001-073



ACCESSION #:
R2974

IDENTIFIED AS:
Cheilocostus lacerus

LOCATION:
Le Jardin Ombragé

SOURCE:
Received from another ginger collector, plant was in cultivation in her garden for many years, origin unknown.

DETERMINATION:
By Dave Skinner, characters match description by Maas. Plant was incorrectly identified as Costus speciosus. As Dr. Maas pointed out in his Notes on Asiatic Species, this seems to be frequently mistaken, but once you become aware of the distinguishing fibrous apex of the bracts and the lack of indument on the flower parts, it is easy to recognize.

GENERAL:
Very tall plant with stocky sheaths and huge inflorescence with large, pure white flowers.

RHIZOME :


SHEATH:
Green, with darker bands, glabrous, about 25 mm in diameter.

LIGULE:
Short, green, glabrous, truncate, 2-4 mm long.

PETIOLE:
Medium to long, green, glabrous, about 20 mm long.

LEAVES:
Green, glabrous upper side, pubescent underside, broadly elliptical, to 45 cm long and 15 cm wide. Base is cuneate to rounded, apex shortly acuminate with 1 mm acumen.

INFLORESCENCE:
Terminal on a leafy stem. Large, showy, born at the top of the tall, nearly straight sheaths. Broad white labellum, very similar to Costus speciosus and often confuse with same.

BRACTS:
Greenish at base turning brownish red toward apex, glabrous, delacerating into figers at margins, somewhat velutinous, shaped elliptical, almost rectangular, 3.5-4.0 cm long by 1.5 -1.8 cm wide.

APPENDAGE:
NONE

BRACTEOLE:
Small and thin, green turning red with age and delacerating into fibers, with "lacerus" (like spider web) white fibers on margins, boat shaped but very thin, 2.0-2.5 cm long and 0.4-0.7 cm wide.

CALYX:
Large, fat, extending beyond bracts, greenish turning red with age and delacerating into fibers at margins same as bract and bracteole. Calyx looks unlike any of the neo-tropical ones, bicarinate and deeply cut on one side, looking almost like the bracteole of some neo tropical Costus (ie: C. osae). Calyx and ovary very large in relation to bract and bracteole, 2.0-2.5 cm long by 1.0 cm wide.

COROLLA:
White, glabrous, lobes 4.5 cm long and 2 cm wide.

LABELLUM:
White with pale yellow throat, glabrous, large spreading lips, 7 cm long by 7 cm wide when spread.

STAMEN:
White with yellow tip, elliptical, 4 cm long by 1.5 cm wide.

STIGMA:


OTHER:


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