Microtis arenaria Lindl.

Notched onion orchid (en)

Species

Angiosperms > Asparagales > Orchidaceae > Microtis

Characteristics

Plants yellowish green. Leaf 150–250 × 3–5 mm. Inflorescence 150–250 mm long, 10–35-flowered. Pedicels c. 1 mm long. Flowers moderately spaced, 3–3.5 × 2–2.5 mm, yellowish green. Dorsal sepal c. 3 × 2.5 mm, obliquely erect, ovate to elliptical, concave, long upcurved apical point. Lateral sepals recurved, inrolled, lanceolate, c. 3.5 × 1 mm, apex blunt. Petals linear, c. 2.5 × 0.6 mm, erect within dorsal sepal, blunt. Labellum oblong to quadrangular, c. 3.5 × 1.5 mm, obliquely decurved away from ovary, margins paler than green lamina, irregular with several cell clusters, apex deeply bilobed, with 2 spreading, angular lobes. Basal callus of 2 large, transverse, dark green, confluent mounds; apical callus minute.
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(Description based on specimens from northern Tas.) Leaf 300–800 × 6–7 mm. Inflorescence 350–600 mm long, rigid, 10–60-flowered. Pedicels c. 1 mm long. Flowers densely crowded, 3–3.5 × 2–2.5 mm, pale green to yellowish green. Dorsal sepal obliquely erect, ovate, c. 2.5 × 2.5 mm, shallowly concave, tip pointed, often upturned. Lateral sepals recurved, ovate to ovate-lanceolate, c. 2.5 × 1 mm. Petals ovate, c. 2 × 0.8 mm, erect within dorsal sepal. Labellum rectangular, c. 2–2.5 × 1.3 mm, margins crinkly with numerous cell-clusters, apex truncate or with an apical mucro or shallow notch. Basal callus of 2 dark green, fused mounds; apical callus obscure, granular.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
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Environment

Found in coastal and near-coastal habitats, particularly heathy forest, coastal scrub and heath in freely draining sand.
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Localised; growing in moist, grassy habitats and open forest.
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Hardiness (USDA) 8-11

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Cultivation

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Images

Microtis arenaria unspecified picture

Distribution

Microtis arenaria world distribution map, present in Australia

Identifiers

LSID urn:lsid:ipni.org:names:644702-1
WFO ID wfo-0000244288
COL ID 438RZ
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Microtis arenaria Microtis biloba Microtis pulchella var. vivax