118 ORCHID ACEAE. 3. Thelymitra. 



Middle lobe of hood shorter than adjacent divisions, 

 smooth on back ; hair-tufts purple ; flowers deep 



indigo blue, not spotted T. azurea 2. 



Middle lobe of hood longer than adjacent divisions, 

 latter incurved, smooth on back ; hair-tufts white ; 

 flowers greyish-green, or brown, with metallic lustre . . T. epipactoides 3. 

 Hood with one entire or bifid lobe between the penicillate 

 ones. 

 Lobe between hair-tufts undivided or with crenate 

 margin. 

 Upper border middle lobe truncate, horizontal, 

 slightly denticulate ; hair-tufts white ; flowers 



blue, petals spotted T. truncata 4. 



Upper border of middle lobe convex, crenate ; hair- 

 tufts yellow ; flowers pinkish or light-red T. luteociliata 5. 



Lobe between hair-tufts bifid or emarginate. 



Crest of middle lobe much higher than hair-tufts, its 

 profile falcate ; plant largest in the genus ; flowers 



numerous, deep-blue T. grandiflora 6. 



Middle lobe dilated, its crest about level with hair- 

 tufts ; plant medium size ; flowers several, lavender, 



sweet-scented T. aristata 7. 



Middle lobe only slightly notched, somewhat 

 tubular, not dilated ; plant medium size ; flowers 



several, dark-blue, not scented T. longifolia 8. 



Middle lobe very deeply cleft ; plant small, slender ; 



flowers generally 1-3, dark-blue, small T. pauciflora 9. 



Hood deeply toothed or fringed, without penicillate lobes ; 

 with a club-shaped appendage on the back ; leaf ovate- 

 lanceolate ; flowers yellow, spotted T. fuscolutea 10. 



Column-wings produced behind the anther, truncate, not 

 hood-shaped, their lateral lobes not bearing hair-tufts. 

 Wings at the back produced higher than anther ; lateral 

 lobes nearly horizontal and more or less rugose. 

 Flowers 1 or 2, small, yellow inside, sepals dark-red out- 

 side, red in the bud ; leaf linear T. urnalis 11. 



Flowers 1-3, rather larger than T. urnalis, pink to 



bright-red ; leaf linear T. carnea 12. 



Wings at back not produced so high as anther ; lateral 

 lobes very small, much exceeded by the thick pubescent 



. anther-point ; flowers small, yellow ; leaf terete T. flexuosa 13. 



Column-wings not produced behind anther ; lateral lobes 

 erect or almost so, and at least as high as the anther. 

 Lateral lobes smooth, reddish-brown, emarginate, higher than 

 anther ; flowers 1-3, large, yellow inside, sepals reddish- 

 brown, outside, reddish in bud ; leaf terete T. antennifera 14. 



Lateral lobes denticulate, yellow, much higher than anther ; 



flowers 1-3, salmon-colored or pinkish ; leaf linear T. Macmillanii 15. 



Lateral lobes spirally involute; flowers blue, veined, deli- 

 cate ; leaf linear T. venosa 16. 



1. T. ixioides (Ixvi-like) Sw. Slender, 20-80 cm. high. Leaf long, linear, channelled. 

 Flowers on very slender pedicels, about 2-6, blue on inside with spotted dorsal sepal and 

 petals ; the sepals reddish-purple on the outside. Perianth-segments (including labellum) 

 not very acute, about 8-9 mm. long, elliptical. Column erect, about 4 mm. long ; wings 

 extended upwards and forwards on either side of anther, ending in white hair-tufts ; 

 between the penicillate lobes 3 shorter truncate denticulate ones, the central much shorter 

 than the others and crested with several rows of calli on the back. Anther slightly above 

 the stigma and rostellum, its blunt point produced a little above the bases of the penicil- 

 late lobes. Pollinia concealed behind stigma. 



N.P., Mount Lofty Range ; Encounter Bay ; Inman Valley ; Naracoorte ; Mount 

 Compass district ; Kangaroo Island ; also in all other States. Oct. -Nov. 



2. T. azurea {deep sky-blue flowers), Rogers. A slender species, usually 10-35 cm. 

 high. Leaf rather long, narrow-linear, often filiform. Flowers a deep azure blue, 1-12. 

 Segments of the perianth veined, 8-9 mm. long. Column rather widely winged, with 

 purple hair-tufts directed upwards and forwards ; the hood between the hair-tufts purple 

 with yellow margin and deeply 3-lobed, the central division denticulate shorter than and 

 often overlapping the adjacent ones, the latter with smooth upper borders. Anther 



