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THAI FOREST BULLETIN (BOTANY) 36

Table 1. Comparison of four similar and often confused species of Argyreia.

Characters

A. obtecta

A. laotica

A. mollis

A. splendens

Glabrous

Glabrous

Glabrous

Shining silvery to coppery sericeous

Shining silvery sericeous

Shining silvery or whitish sericeous

Ovate, elliptic, lanceolate (widest at or below midpoint)

Ovate to elliptic (widest at or below midpoint)

Ovate to broadly elliptic (widest at or below midpoint)

10–12

10–12

12–16

Veins prominent above

Veins prominent above

Veins prominent above

Funnelform

Funnelform

Funnelform

indumentum of

Appressed

leaf upper side

strigose

Indumentum of

Sericeous but

leaf underside

not shining

Blade shape

Often obovate (widest above midpoint)

No. 2° veins/side 7–9

Stem

Robust

Slender

Slender

Robust

Peduncle length Short

Short

Short

Long

All sepals hairy

All sepals hairy

Outer sepals

out to margins

out to margins

hairy to

Sepals

margins (inner not visible)

Sepals subequal

Sepals equal (or

inner 3 smaller

outer longer

than inner)

Corolla shape Calyx

Leaf surface smooth (veins

not evident) Campanulate

Sepals subequal Sepals unequal outer 2 < inner 3 outer 2>>inner 3

Orbicular to broadly elliptic

Sepal pubescence

Inner sepal margins

glabrous, drying dark

2° vein promin

ence

Elliptic, apex obtuse

Ovate to broad ovate, inner with

Elliptic to lanceolate,

outer 2 with undulate apex

dark glabro margins

us

Given these clear morphological differences, we have taken up the name A. obtecta for a widespread species in Thailand, Burma, peninsular Malaysia, and possibly ranging across Indochina to southeastern China. Argyeia mollis, as used here, is a species ranging from western Thailand southward through Malaysia into the Indonesian islands. The name A. splendens, as used in the past by Staples in herbarium annotations and in publications, corresponds in part to A. laotica and in the greater part to A. mollis as defined here. Likewise the specimens cited by Traiperm in her M.Sc. thesis as A. splendens are a mixture of A. laotica and A. mollis. A list of all Thai specimens in this complex of four species, with

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