144 



ORCHIDACEAE. 



15. Diuris. 



the claw about 4 mm. long ; the lamina oval or elliptical, about 16 mm. long. Labellum 

 about 10 mm. long, dark-brown and yellow blended ; lateral lobes nearly as long as 

 the middle one, wide, obcuneate, margins entire, the anterior one rounded, recurved, 

 about 10 mm. long (from base of label- 

 lum) ; middle lobe about the same length 

 or a little longer, its anterior border 

 rounded and retuse ; lamina with a single 

 (very rarely double) raised line at its ex- 

 treme base merging into a central keel 

 extending to the tip. Anther without a 

 point, about the same height as the viscid 

 disk of the rostellum. Lateral appendages 

 about the same height, linear-falcate, with 

 an irregular upper border. 



N.P. Distributed very widely in this 

 and all other States except Queensland. 

 Sept. -Oct. 



6. D. palachila (spade-shaped labellum), 

 Rogers. Slender, glabrous, 10-40 cm. high. 

 Leaves 2r5, narrow-linear or linear, some- 

 what lax, often reaching a length of 17 cm. 

 Flowers 1-3 on long and slender pedicels, 

 yellow with brown markings. Dorsal sepal 

 yellow, usually with brown blotchings or 

 dots chiefly on the outer surface near the 

 base and around the margins, about 11 

 mm. long ; lateral sepals green, linear, 

 acuminate, spreading below the labellum 

 parallel or more rarely crossed, about 15 

 mm. long Petals of similar color and 

 markings to the dorsal sepal ; stalk 

 greenish-brown about 4£ mm. long ; lamina 

 elliptical about 10| mm. long ; spreading. 

 Labellum yellow with dark brown dots, 

 short linear splashes and blotches especially 

 on its lower surface ; about 1 1 mm. long ; 

 lateral lobes about 6| mm. long (rather 

 more than half the length of the middle 

 one), narrow-lanceolate with upturned 

 dentate margins and outwardly curved 

 free ends ; middle lobe spade or shovel 

 shaped, apex crescentic ; lamina with 2 

 widely separated raised longitudinal lines 

 on the narrow base, ending abruptly in 2 

 teeth at the expanded part, thereafter 

 merged into a central keel extending to 

 the apex. Anther as high as viscid disk 

 of rostellum, rather flat with a very short 

 point. Lateral appendages of the column 

 as high as the anther, oblong -falcate, an- 

 terior margins dentate. 



N.P. and Mount Lofty Range ; Angaston 

 also from Victoria. Sept. 



Text-figure 33. — A. Two flowers of Diuris 

 longifolia, front and side views ; 11 b, lateral 

 lobe labellum ; m I, middle lobe of labellum. 

 All natural size. Fig. 1. — Column from front; 

 ped., pedicel (style) of stigma, which together 

 with the stigma (st.) and viscid disk (g) con- 

 stitutes the stigmatic-plate. Fig. 2. — Same 

 from back ; st-pl, stigmatic plate. Fig. 3. 

 Same with anther and wings removed, show- 

 ing the pollinia (pm.) hanging from the back 

 of the viscid disk. Fig. 4. — Same from the 

 side, wings removed ; the pollinia can be seen 

 between the anther (a) and stigmatic-plate. 

 All details enlarged. 



McLaren Vale ; Golden Grove : Robe : 



7. D. brevifolia {short-leaved), Rogers. Slender, glabrous, 15-40 cm. high, 

 generally 4-8, linear or setaceous, acuminate, not twisted, very erect, usually 7-12 cm. 

 long, rarely reaching beyond the middle of the stem. Flowers solitary or in a loose 

 raceme of 2-4, on slender pedicels, yellow with a few brown markings, much smaller than 

 those of D. sulphurea. Dorsal sepal ovate, yellow with a dark brown spot on each side of 

 the dorsum near the base, recurved, about 1 1 mm. long ; lateral sepals green, about 

 15 mm. long, linear, acuminate, parallel, spreading below the labellum or slightly recurved. 

 Petals shortly stalked, about 14 mm. long, spreading, recurved ; lamina canary -yellow, 

 elliptical, about 11 mm. long. Labellum yellow, at least as long as the dorsal sepal and 

 generally longer, about 12 mm. long ; lateral lobes less than half as long as central lobe, 

 generally about 5 mm., not very wide, margins entire, tips recurved ; middle lobe rhombo- 

 cuneate with depressed antero-lateral margins ; lamina with 2 closely approximated 

 parallel raised lines on the basal half continuous with the anterior central keel, the lines 

 surrounded in front and on both sides by a conspicuous dark brown border. Anther 



