New Taxa Austral. Orchid. (Austral. Orchid Res. 2) 14 (1991) APNI
Threat status:Victoria: rare (r)
Flowering plant 25–32 cm tall. Leaf 10–20 cm long, 4–7 mm wide. Flowers 1 or 2; perianth segments 3–5 cm long, pale greenish-yellow to pale yellow, lateral sepals and petals divergent; sepals flattened at base, 3–5 mm wide, abruptly tapered to a filiform, clubbed tail, club 3–14 mm long, with closely spaced but not contiguous, sessile glands; petals shorter than sepals, flattened at base, tapered to long acuminate apex, usually glandular, sometimes clubbed. Labellum curved forward with apex recurved and lateral lobes erect, lamina ovate, obscurely 3-lobed, 13–18 mm long and 10–12 mm wide (when flattened), greenish-yellow or yellow, sometimes with prominent dark red mid-lobe; marginal calli on lateral lobes scimitar-shaped, to 2 mm long, on mid-lobe shorter and saw-like; lamina calli in 4 or 6 rows, not extending far onto mid-lobe, narrow, foot-shaped, c. 2 mm long at base of lamina, decreasing in size towards apex Flowers Dec.–Jan. Flowering enhanced by fire.
HNF, HSF, MonT, SnM, Wim. Also NSW, ACT. Widespread in north-eastern Victoria, growing on sheltered ridges and slopes in high-altitude woodlands with a grassy understorey.
Caladenia aestiva is similar to C. flavovirens, but the former has prominently clubbed sepals and relatively broad, scimitar-shaped marginal calli on the labellum. The true distribution of C. aestiva is somewhat obscured by confusion with C. flavovirens.
Caladenia aestiva has been confused with C. pallida, which is now considered to be a Tasmanian endemic.
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