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Botanical Description page for GingersRus plant database number " 4602 ".

You can select the botanical description of a different plant from this list: Click arrow to see list, then click GO Chamaecostus congestiflorus Chamaecostus curcumoides Chamaecostus cuspidatus Chamaecostus fragilis Chamaecostus fusiformis Chamaecostus lanceolatus Chamaecostus subsessilis Cheilocostus globosus Cheilocostus lacerus Cheilocostus speciosus Cheilocostus sopuensis Costus "El Whiskey" Costus sp. from Cabo Matapalo Costus acreanus Costus afer Costus albus Costus allenii Costus amazonicus Costus arabicus Costus asplundii Costus asteranthus Costus barbatus Costus beckii Costus bracteatus Costus chartaceus Costus claviger Costus claviger aff Costus comosus var. bakeri Costus comosus Costus cordatus Costus cupreifolius Costus curvibracteatus Costus deistelii Costus dewevrei Costus dirzoi Costus dubius Costus erythrocoryne Costus erythrophyllus Costus erythrothyrsus Costus fissiligulatus Costus foliaceus Costus gabonensis Costus geothyrsus Costus glaucus Costus guanaiensis Costus guanaiensis var. macrostrobilacius Costus guanaiensis var. tarmicus Costus juruanus Costus laevis Costus lasius Costus lateriflorus Costus letestui Costus leucanthus Costus ligularis Costus lima Costus longebracteolatus Costus lucanusianus var. major Costus lucanusianus Costus Maas species A Costus Maas species B Costus maboumiensis Costus macranthus Costus maculatus Costus malortieanus Costus montanus Costus nitidus Costus nudicaulis Costus oblongus Costus osae Costus phaeotrichus Costus pictus Costus plicatus Costus plowmanii Costus potierae Costus productus Costus pulverulentus Costus quasi-appendiculatus Costus ricus Costus sarmentosus Costus scabe Costus spectabilis Costus spicatus Costus spiralis Costus sprucei Costus stenophyllus Costus subbiflorus Costus tappenbeckianus Costus tonkinensis Costus vargasii Costus varzearum Costus villosissimus Costus vinosus Costus violaceus Costus viridis Costus wilsonii Costus woodsonii Costus zamoranus Costus zingiberoides Paracostus englerianus Paracostus paradoxus

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Costus zamoranus

Costus zamoranus Steyerm.

BOTANICAL NAME: Costus zamoranus
SUBGENUS:Costus
GROUP:2-bracts not appendaged
SECTION:I-Costus
PRIMARY SOURCE USED FOR DESCRIPTION:Maas, Flora Neotropica No. 18, 1977
SECONDARY SOURCES:
LAST UPDATED:
NOTES AND DISTINGUISHING CHARACTERISTICS:In Flora Neotropica No. 8, Maas evidently had little information about the floral structure of this species, indicated it is close to C. amazonicus, distinguishable by the calyx. In Flora Neotropica No. 18 he amended the description, excluding the Colombian specimens and indicates it is very closely related to Costus laevis.

The photos are from a plant identified by Tom Wood as Costus zamoranus. I have not verified that it matches this description. Note that this species is described with basal inflo. and no appendages to the bracts.
NATURAL DISTRIBUTION:along streams, 1000-2000 meters, Ecuador and Colombia, prov. of Santiago-Zamora & Morona-Santiago, between 1300 and 2000 m.
HEIGHT:1 to 2 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 Part	General	Color	Hairs	Texture	Shape	Length	Width
Rhizome						0 to 0 cm	0 to 0 cm
Sheath			glabrous to sparsely strigulose or villose			0 to 0 cm	8 to 20 mm
Ligule			glabrous		truncate	1 to 5 mm	0 to 0 mm
Petiole			glabrous			10 to 20 mm	0 to 0 mm
Leaf	20-26 cm long, 4-9 cm wide				narrowly elliptic	20 to 26 cm	4 to 9 cm
...upper			glabrous with scattered hairs at apex and margins
...under			glabrous
...base					cuneate
...apex					shortly acuminate	0 to 0 mm
Inflorescence	Basal - on a separate leafless shoot about 50 cm tall				ovoid, obtuse	9 to 10 cm	5 to 7 cm
Bract	not velutinous, margins not delacerating into fibers, callus 4-7 mm long or inconspicuous	red to reddish brown	glabrous	coriaceous	broadly ovate, obtuse	3.5 to 4.5 cm	2.0 to 4.0 cm
Appendage	none					0.0 to 0.0 cm	0.0 to 0.0 cm
Bracteole			glabrous	margins entire or delacerating into fibers	boat shape	2.8 to 3.0 cm	0.0 to 0.0 cm
Flower						0 to 0 cm	0 to 0 cm
Calyx	10-19 mm long	red	glabrous		lobes deltate to shallowly triangular	1.0 to 1.3 cm	0.6 to 0.8 cm
Corolla		yellow	glabrous			0.0 to 7.0 cm	0.0 to 0.0 cm
Labellum		reddish brown			large spreading	5.0 to 6.0 cm	5.0 to 6.0 cm
Stamen	anther 7 mm long				narrowly elliptic	0.0 to 5.0 cm	0.0 to 1.0 cm

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