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Costus Species Botanical Description Botanical Description page for GingersRus plant database number " 7365 ".
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Costus araneosus

Costus araneosus Gagnep.

BOTANICAL NAME: Costus araneosus
PRIMARY SOURCE USED FOR DESCRIPTION:Schumann - Das Pflanzenreich, 1904
NOTES AND DISTINGUISHING CHARACTERISTICS:Schumann only lists two species in the subgenus metacostus - this one and C. lateriflorus. C. araneosus is distinguished from lateriflorus by longer bracts and undersides of leaves softly tomentose (densely matted hairs). NOTE: flower color of this species not described.

A. Bracteae 1-1.2 cm longae, calyx 1.5 cm metiens, folia subtus, molliter tomentosa . . . . . . . . . . 71. C. araneosus. B. Bracteae 5-6 mm longae, calyx 1.8 cm metiens, folia subtus, glabra . . . . . . . . . .. . . . . . . . . . . . 72. C. lateriflorus.

71. C. araneosus Gagnepain in BuII. Soc. bot. France 4. ser. II:(1902) 95; Bull. Soc. hist. nat. Autun XV. (1902)16, 19 [Hoc loco cl. Gagnepain sphalmate indicavit, hanc speciein jam 1892 publici juris factam esse.]

Planta minus valida, caules graciIes torti 7 mm tantum, diametro. Folia lanceolata attenuato-acuminata basi longe angustata supra glabra subtus molliter tomentosa. 12-20 cm Ionga et 4-6 cm. lata; vagina striata molliter pilosula; ligula 1.5-2 cm longa integra obtusa pilosula margine pilis longissimis flexuosis tenerrimis araneoso-ciliata. Spica lateralis parva 2.5 cm longa et 1.5-.8 cm lata pauciflora; bracteae pro rata parvae. 1- 2 cm tantum longae et latae non foliaceae apice rotundatae; flores in toto 6 cm longi; calyx hos superans 1.5 - 1.6 cm longus tubulosus tridentatus, unilateraliter fissus extus pilosulus, dentes ciliolati; corollae tubus calycem vix superans gracilis, lobi subaequales lanceolati acuti 3.5 cm longi; stamen laneeolatum acutum 4.5 cm longum 9 mm latum, anthera tertia parte ei adnata; ovarium pilosum.

Unteres Congogebiet: Bei Brazzaville (P. de Brazza n. 100, bluhend Ende Septembe rund Anfang Oktober).

Nota. Propter inflorescentiam lateralem hanc speciem in affinitatem C. lateriflori Bak. collocavi. Cl. Gagnepain de constantia hujus characteris non omnino certus fuit et re vera indagationes accuratae loco natali de hac re maxime desiderantur. Cum C. latertfloro Bak. haec species taliter charactetibus essentialibus ceteris congruit, ut certissime cum eo in idem subgenus pertineat.
HEIGHT:0 to 0 meters
Botanical Description for this Species
For illustrations or explanation of terminology, click on the linked plant part or column header.
Descriptions used for plant identification key are shown in BOLD.
Plant PartGeneralColorHairsTextureShape LengthWidth

0 to 0 cm0 to 0 cm

softtly pilosulous
0 to 0 cm 0 to 7 mm

margn pilosulous, long ciliate

15 to 20 mm 0 to 0 mm

0 to 0 mm 0 to 0 mm

12 to 20 cm 4 to 6 cm



softly tomentose


narrow at base


0 to 0 mm
Inflorescence lateral

0 to 2 cm 1 to 1 cm
Bract proportionally small

1.0 to 2.0 cm 1.0 to 2.0 cm
Appendage NONE

0.0 to 0.0 cm 0.0 to 0.0 cm

0.0 to 0.0 cm 0.0 to 0.0 cm

0 to 6 cm 0 to 0 cm


tubular, tridentate, split one side
1.5 to 1.6 cm 0.0 to 0.0 cm

0.0 to 3.5 cm 0.0 to 0.0 cm

0.0 to 0.0 cm 0.0 to 0.0 cm

0.0 to 4.5 cm 0.0 to 0.9 cm

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