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Genoplesium sp. Charmhaven (NSW896673)
Family Orchidaceae
Genoplesium sp. Charmhaven (NSW896673) APNI*

Synonyms: Corunastylis sp. Charmhaven (NSW896673) APNI*

Description: Terrestrial tuberous herb.

Leaf 19.5 cm long, 1.8 mm wide, slender, terete, [colour mostly unknown]; lamina 16 mm long (measured from base of terete part; 25 mm from tip to base of slit), 1.4 mm wide, linear-lanceolate, sheathing the scape, ending 8.5 mm above base of the first flower.

Flowers c. 8.5 mm between tip of dorsal sepal and tips of lateral sepals, 6 mm between tips of lateral petals, green and cream with deep maroon markings, semi-erect to erect. Ovary 2.7–3.8 mm long, ellipsoidal, curved. Dorsal sepal 4.0–4.5 mm long, 2.0–2.1 mm wide, ovate, cucullate, glabrous, greenish cream, with 3 maroon veins and maroon margins. Lateral sepals 5.0–5.5 mm long, 1.3–1.4 mm wide, narrow-ovate, bent abaxially c. 1 mm above base through 45º -100º, erect to ascending, slightly to prominently divergent, distally involute, green with heavy reddish suffusion in basal 1/2 to 2/3, glabrous. Lateral petals 3.5–3.7 mm long, 1.0–1.2 mm wide, narrow-ovate, acute or shortly acuminate, divergent, cream with 3 maroon veins and maroon margins, with sparsely ciliate margins; cilia mostly less than 0.1 mm long. Labellum 3.2 mm long, 1.5 mm wide, obovate, rounded distally, with recurved, mucronate apex, maroon, narrowed in proximal 2/3, thick and fleshy, the margins densely cilaite [sic] with trichomes varying in length from < 0.1 mm long to 1.0 mm long; callus extending almost to labellum apex, deeply channelled for basal 2/3 of its length, widest (0.7 mm just below the middle, thickest in the basl [sic] half. Column 2.2 mm long, erect, with two proiminent [sic] basal callosities; foot c. 0.5 mm long, projected forwards, curved upwards. Column wings finely scabrous, notched in distal 1/5 to 1/6, oblong-obovate in outline, with lobes not divergent, both acuminate. Anther 1.0 mm long, truncate. Stigma broad-elliptical, 0.8 mm long, 0.7 mm wide. Pollinarium 1.0 mm long; pollinia 0.45 mm long, yellow [sic], granular; hamulus 0.45 mm long; viscidium 0.3 mm wide.

Photo Brian Towle

Photo Brian Towle

Distribution and occurrence: Currently only known from the Wyong Shire of NSW.

Occurs within low woodland to heathland with a shrubby understorey and ground layer. Dominants include Allocasuarina littoralis, Leptospermum juniperinum, Melaleuca nodosa, Callistemon linearis and Schoenus brevifolius.
NSW subdivisions: CC

Threatened species: NSW BCA: Critically Endangered; Commonwealth EPBC: Critically Endangered
AVH map***

Genoplesium sp. Charmhaven (NSW896673) is similar to Genoplesium archeri (syn. Corunastylis archeri) but differs from G. archeri in having fewer, larger flowers (6-9 flowers, 6 mm across, versus 10-20 flowers, 4.5–5 mm across in G. archeri), borne on a shorter inflorescence (1.4 cm long versus 2–3.5 cm long in G. archeri). Genoplesium sp. Charmhaven (NSW896673) is also similar to G. stephensonii.

Text by Peter Weston, with minor edits by Matt A.M. Renner (4 Feb 2021).
Taxon concept:

APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.
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