1.5. Diuris. ORCHID ACEAE, 143 



and rather closely approximated raised longitudinal lines ending near the middle in 2 

 tooth-like processes. Lateral appendages of column more or less lanceolate, as high as 

 the anther, their front margins yellow, sinuous, nearly meeting each other in front of 

 the stigmatic plate. — D. elongata, Sw. 



Mount Gambier district ; also Queensland ; New South Wales ; Victoria. Oct.-Noy. 



2. D. pedunculata (stalked), R. Br. Slender, glabrous, usually 20-40 cm. high. Leaves 

 generally 5-7, linear, 10-15 cm. long. Flowers large, solitary, or 2-4 on very slender 

 pedicels, racemose, canary-yellow, with brown or greenish -brown tinges on the outer 

 surface of the perianth-segments and labellum at the base. Dorsal sepal yellow, broadly 

 ovate, erect, much shorter than the other segments of the perianth, also shorter than the 

 labellum, about 14 mm. long ; lateral sepals free, green, linear-lanceolate, channelled on the 

 inner side., spreading below the labellum, 20-23 mm. long. Petals with yellow elliptical 

 lamina ; the stalks green, linear, about 6 mm. long ; with a total length of 16-17 mm. ; 

 spreading in the mature flower. Labellum yellow, about 18 mm. long and 12 mm. wide, 

 almost flat in mature flower, tip very blunt, spreading ; lateral lobes narrow falco -lanceo- 

 late, toothed on their outer margins, 6-7 mm. long, recurved outwards ; middle lobe 

 on a contracted base, ovate-rhomboid, about 3 times as long as the lateral ones ; the 

 lamina with 2 raised rather widely separated pubescent longitudinal lines on the base, 

 the lines often laminate, ending dentately a little beyond the contracted part, then con- 

 tinued as a single line or fold towards the tip. Anther flat or almost so, shorter than 

 the viscid disk. Lateral appendages narrowly ovate-lanceolate, very acuminate, margins 

 slightly toothed, same height as anther. 



N.P. and Mount Lofty Range ; Clare ; Beetaloo ; Angaston ; Kooringa ; Hundred of 

 Goyder ; Millicent district ; also all Eastern States and Tasmania. Sept. 



3. D. palustris (swampy), Lindl. Small, glabrous, about 10 cm. high, seldom exceeding 

 18 cm. Leaves 8-10, erect, usually more than half the length of scape, channelled, 

 setaceous and twisted or very narrow-linear. Flowers rather small, 1-4 on long slender 

 pedicels, yellow blotched with dark-brown, the dark color prevailing on the outside ; 

 pervaded by faint odour of spice or nutmeg. Dorsal sepal ovate, recurved in the upper 

 half, purple or dark-brown behind the anther, yellowish beyond this, about 8|- mm. long ; 

 lateral sepals green, free, linear, parallel, spreading below the labellum, about 16mm. 

 long ; petals stalked more than about half as long as lateral sepals ; the pedicel purplish, 

 narrow-linear, about 4 mm. long ; the lamina yellow, oval, emarginate at the tip, 

 recurved, about 6 mm. long and 4£ mm. wide. Labellum about 6£ mm. long ; lateral 

 lobes erect, about 4| mm. long, oblong with rounded crenate anterior margins, margi ns 

 otherwise entire, yellow on inner surface, much blotched outside ; middle lobe oblong ; 

 lamina with 2 thick fleshy parallel longitudinal raised lines from the base to beyond the 

 middle, thereafter merging into a single short raised line dilating at the anterior margin 

 into a rounded emarginate eminence ; dark-brown spots at end of the 2 raised lines and 

 also at the tip. Anther blunt, rather narrow, a little higher than the rostellum. 



N.P. and Mount Lofty Range ; Hornsdale ; Wirrabara Forest ; Crystal Brook ; 

 Beetaloo ; Pichi Richi Pass ; Angaston ; Goolwa ; Monarto ; Robe ; Millicent ; Yorke 

 Peninsula ; also Victoria and Tasmania. Aug. -Sept. 



4. D. maculata (spotted), Sm. Moderatsly slender, seldom exceeding 30 cm. high. 

 Leaves 2 or 3, narrow-lanceolate, channelled, rarely exceeding 10 cm. long. Flowers 

 from 2-6, on rather slender pedicels in a flexuose raceme ; yellow, much blotched with 

 dark-brown, the latter color rather distinctly demarcated from the ground yellow and 

 not merging into it (as in D. longifolia), the undersurface of the perianth more blotched 

 than the upper. Dorsal sepal more or less ovate ; margins irregularly sinuous, apex 

 bent forward ; about 9 mm. long ; lateral sepals rather stoutly linear with oblique points, 

 greenish, recurved and crossed in the mature flower, about 11£ mm. long. Petals with a 

 total length of 15 mm. ; the stalk linear, dark-brown, reflexed, about 6 mm. ; lamina 

 orbicular or almost so, spreading, upper surface yellow, lower surface much blotched 

 with dark-brown. Labellum shorter than dorsal sepal, about 6 mm. long ; lateral lobes 

 upturned with wide crescentic crenate recurved anterior margins, as long as middle lobe ; 

 middle lobe obcuneate with widely refuse truncate tip ; lamina with 2 rather widely 

 separated fleshy prominent raised lines ending about the middle in 2 acute teeth. Anther 

 with very short point, about as high as the viscid disk. 



N.P. and Mount Lofty Range ; Kooringa ; Yeelanna ; and many other parts of the 

 State ; also in all eastern States and Tasmania. Sept. 



5. D. longifolia (long -leaved), R. Br. (Text fig. 33, figs 1-4.) Stouter than most other 

 members of the genus, 10-45 cm. high. Leaves 2 or 3, linear or lanceolate, acute, chan- 

 nelled, usually of unequal length, 7-20 cm. long, 4-12 mm. wide. Flowers large, some- 

 times solitary, more often 2-5 on slender pedicels in a loose raceme, yellow and brown, 

 the two colors suffusing into each other as in the wall-flower. Dorsal sepal much shorter 

 than the other segments, very broad and rounded, about 10 mm. long ; lateral sepals 

 green, linear, rather stout, spreading horizontally, with blunt oblique points, usually 

 parallel but occasionally crossed, 18-19 mm. long. Petals stalked, recurved or spreading ; 



