Page author: Hattie Palmer
Malaxis monophyllos
white adder's-mouth, one-leaved malaxis

Origin: Native

Conservation Status: Sensitive in Washington (WANHP)


Herbaceous perennials, terrestrial to somewhat epiphytic, glabrous throughout, to 25 cm tall; pseudobulbs at base of stems, globose, 5-10 mm diameter; fibrous roots few, 0.3-1 mm wide.


Leaves 1-3, on lower 1/3 of stem, more or less elliptic, base sheathing.


Inflorescence a racemose terminal spike, 1-12 cm, floral bracts insignificant; flowers 5-80, light green to light yellowish-green, commonly resupinate, pedicellate; sepals spreading, 1-6 ,mm, lanceolate to narrowly ovate or narrowly oblong, margins curled backward, apex acuminate; petals curved backward, linear to somewhat lanceolate or filiform, apex rounded; labellum ovate to broadly deltate, concave, base truncate, with forward-directed lobes, apex unlobed and acuminate; column free, 0.4-0.8 mm long and wide; anther terminal; pollinia yellow.


Capsules, ascending, 5 mm long and 3 mm broad, ellipsoid; previous year’s fruiting structures commonly persist into present year’s flowering period.

Accepted Name:
Malaxis monophyllos (L.) Sw.
Publication: Kongl. Vetensk. Acad. Nya Handl. 21: 234. 1800.

Synonyms & Misapplications:
(none provided)
var. brachypoda – North American white adder's-mouth
Additional Resources:

PNW Herbaria: Specimen records of Malaxis monophyllos in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Malaxis monophyllos checklist entry.

E-Flora BC: Malaxis monophyllos atlas page.

CalPhotos: Malaxis monophyllos photos.

USDA Plants: Malaxis monophyllos information.

2 photographs:
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