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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
SUBGENUS:Metacostus
GROUP:
SECTION:
PRIMARY SOURCE USED FOR DESCRIPTION:Schumann - Das Pflanzenreich, 1904
SECONDARY SOURCES:
LAST UPDATED:
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.
NATURAL DISTRIBUTION:Congo
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
Rhizome




0 to 0 cm0 to 0 cm
Sheath

softtly pilosulous
striate
twisted
0 to 0 cm 0 to 7 mm
Ligule

margn pilosulous, long ciliate


15 to 20 mm 0 to 0 mm
Petiole




0 to 0 mm 0 to 0 mm
Leaf



lanceolate-attenuate
12 to 20 cm 4 to 6 cm
...upper

glabrous




...under

softly tomentose




...base



narrow at base


...apex



acuminate
0 to 0 mm
Inflorescence lateral




0 to 2 cm 1 to 1 cm
Bract proportionally small



round
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
Bracteole




0.0 to 0.0 cm 0.0 to 0.0 cm
Flower




0 to 6 cm 0 to 0 cm
Calyx

pilosulous

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




0.0 to 3.5 cm 0.0 to 0.0 cm
Labellum




0.0 to 0.0 cm 0.0 to 0.0 cm
Stamen




0.0 to 4.5 cm 0.0 to 0.9 cm

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