Journal Number 98
February 2006


THE COLUMN

Caladenia aff. bartlettii
By Eric Scanlen

A rare taxon first found by Doug McCrae at Sweetwater north of Kaitaia circa 1982. Doug sent plants to Dr BPJ Molloy who flowered them in October 1989 at Lincoln. Bruce Irwin saw a three
flowered specimen at D. McCrae's old place at Paranui. Other finds as below.

Description

Plant terrestrial, c.120mm tall.

Leaf green, solitary, linear, V section, curving away from the reddish base, c.40 x 1.4mm, white hairs underneath.

Peduncle green/brown but shading to red in the 2mm below the ovary, clothed in red glandular
trichomes. Floral bract, 5mm long, tightly clasping, greenish with a red fringed upper margin,
at the base of the ovary. Mid stem bract similar to floral bract.

Ovary 4mm long, green with three raised, even width, red sepal ribs, white on the edges and red
on the tops packed with red and white trichomes, all with red glands atop; between the ribs green, sprinkled with red glanded white trichomes.

Flowers 1-3, 12mm high, 8mm wide, unmistakably Caladenia.

Sepals obovate, 3 prominent parallel veins, 2 others less well defined near the margins, white at the base shading to maroon tips outside, cerise inside, outer mid ribs continuing the red lines from the ovary, shading to dark maroon at the tips, giving the buds a distinctive red and white striped appearance with a dark cap. Red glanded white trichomes numerous at the outer bases thinning towards the tips and only 8 or 10 inside at the bases.

Dorsal sepal 6.2 x 1.7mm, erect, curls forward in maturity.

Lateral sepals 5.4 x 2.0mm, drooping, overlapping, deflexed and concave backwards.

Lateral petals 5.4 x 1.3mm, wide, lanceolate, falcate, drooping less than the sepals, 3 prominent, parallel veins, sparse red glanded white trichomes inside at the bases, cerise-pink outside with a darker midrib, cerise tips inside fading to white at the bases.

Labellum 3.5 long x 4.1mm wide, 3 lobed, white with 4 or 5 dark cerise bars across inside including the lateral lobes and one under the disc; two parallel rows of c. 6 red calli down the disc with a cluster at the back, are topped with globular yellow glands; lateral lobes projecting forwards at the top and curved up to partially obscure the column; midlobe 1.5 long x 0.8mm wide, concave upwards at first then downwards some time later, margin undulate-sinuate, bright yellow, one basal marginal callus at each side, flat, obtuse and yellow.

Column arched forward, translucent wings obscured by the labellum side-lobes; broad red bars adorn the lower two thirds, inside and out; a low green callus crosses above and behind the anther, with a tapering red area beyond; anther red above, white below, pollinia white, connective 0.4mm long, acicular, red to white at the tip.

Habitat
Track-side, on sand hills iron-pan, favours leaf mould under Mingimingi and Hakea sericea.
More exposed plants in mid track were stunted with slightly deformed flowers.

Similar species
Caladenia bartlettii flowering 2-4 weeks earlier, has a deflexed midlobe with upturned
margins bearing 2 basal, marginal calli each side; tepals are held straight out, coplanar not
deflexed.

Caladenia aff. pusilla flowering 2-4 weeks earlier, has 3 marginal calli to the base of the
deflexed midlobe, tepals are concave inwards, especially the lateral petals and the dorsal sepal
which lies continually in contact with the column.

Refer NZNOG Journals 78:20,26 colour page 3,33,36; 86:13; 89:23; 94:29,31,35; 9528; 96:21

See Photo On Back Cover

 

Fl. dates  Specimen locations NZMS 260 Altitude Comments
         
26 Oct 89 Lincoln, ex Sweetwater ER4 004 279851 Say 35m D McCrae
05 Nov 00 Shenstone BIk Caladenia Tk NO2 919423 80m D Abrahams
11Oct 02 Shenstone Blk, Fri 2 Tk. ER3 NO2 928422 105m G Penniall
31 Oct 04 Scott Point, Te Paki, ER3 NO2 841428 70m A Ducker

 

 

 

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