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Malaxis unifolia Michx.
Green Adders-Mouth-Orchid

Life   Plantae   Monocotyledoneae   Orchidaceae   Malaxis

Malaxis unifolia
© Les Mehrhoff, 2008-2010 · 3
Malaxis unifolia

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Following modified from MissouriPlants.com
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Malaxis unifolia  Michx. - Green Adder's Mouth

Malaxis unifolia plant

Family - Orchidaceae

Stems - Flowering stems to 30cm tall, erect, herbaceous, glabrous, slightly angled or winged, from a fleshy corm and fleshy roots.

Leaves - One per flowering stem. Often a much reduced leaf may be present near the base of the flowering stem also. Stem leaf ovate, entire, glabrous, green adaxially, silvery-green abaxially, acute, to 8cm long, 5cm broad, sheathing at the base all the way to the base of the flowering stem.

Inflorescence - Terminal raceme, dense in flower, elongated in fruit. Pedicels to 1cm long, glabrous, subtended by a small subulate bract. Bracts to 3mm long, glabrous.

Flowers - Small, green, 5mm long, glabrous. Floral tube 2mm long. Upper sepals deflexed, 2mm long. Lower sepals rounded at the apex, 2mm long, the margins revolute. Lateral petals thin, linear, to 1.5mm long, recurved. Corolla lip 2-lobed, 2.5-3mm long. The lobes acute. The upper lip whitish-green. Column 3-lobed (the lobes acute), .75mm long. Capsules spreading, 3-6mm long, elliptic, ribbed.

Malaxis unifolia flowers Flowers.

Flowering - May - July.

Habitat - Mesic to dry upland woods, typically on acidic substrates.

Origin - Native to U.S.

Other info. - This little orchid is found in the Ozark region of Missouri. Because of its green color and small size, the plant is easily overlooked in the field. This is an easy plant to ID, however, as nothing else in our flora resembles it.

Photographs taken at Alley Spring Park, Shannon County, MO., 6-23-03.

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Following modified from Plants Database, United States Department of Agriculture
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http://plants.usda.gov/java/profile?symbol=MAUN ---> https://plants.usda.gov/java/profile?symbol=MAUN
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Following modified from Flora of North America
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Link to Flora of North America home
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FNA Vol. 26 Page 627, 628, 630 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 26 | Orchidaceae | Malaxis

6. Malaxis unifolia Michaux, Fl. Bor.-Amer. 2: 157. 1803.

Green adder's-mouth, malaxis unifolié

Malaxis ophioglossoides Muhlenberg ex Willdenow; M. thlaspiformis A. Richard & Galeotti; Microstylis grisebachiana Fawcett & Rendle

Plants 3—50 cm. Pseudobulbs 5—20 mm diam. Leaves 1(—2, rarely), near middle of stem; blade bright green, glossy, narrowly to broadly ovate, keeled abaxially, 1.6—10 × 0.5—5 cm, apex acute. Inflorescences racemes, appearing umbellate before elongation of rachis, 1—13 cm; floral bracts triangular, 0.16—1.4 mm; pedicels (3.8—)5—10(—13) mm. Flowers 10—160, resupinate, green; dorsal sepal oblong-elliptic, 1.1—1.9 (—2.2) × 0.5—1 mm, apex acuminate; lateral sepals oblong-elliptic, 1.1—1.9(—2.2) × 0.5—1 mm, apex acuminate; petals strongly recurved, linear to filiform, slightly falcate, 0.8—1.7(—3) × 0.1—0.2(—0.3) mm; lip rhombic-deltate to cordate-ovate or oblong-elliptic, 1.1—2.3 × 1—2.2 mm, base cordate or auriculate, auricles less than 0.6 times as long as distance from base of lip to apex of middle lobe, apex 3-dentate; column 0.4—0.6 × 0.4—0.6 mm; pollinia yellow. Capsules spreading to slightly drooping, subglobose to ellipsoid, 8 × 4 mm.

Flowering spring--fall (south--north). Swamps, bogs, sand barrens, heathlands, and dry woods; 0--600 m; Man., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que.; Ala., Ark., Conn., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., N.H., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Vt., Va., W.Va., Wis.; Mexico; West Indies; n Central America.

Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Malaxis+unifolia+&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Malaxis+unifolia+&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant
&pull 20q v4.662 20091102: Error 501 Protocol scheme 'https' is not supported (LWP::Protocol::https not installed) https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Malaxis+unifolia+&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

Updated: 2018-05-21 19:48:13 gmt
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