19. Pterosti/lis. ORCHIDACEAE. 151 



6. P. pedunculata (stalked), R. Br. Very slender, 10-22 cm. high. Leaves basal. 

 rosulate, ovate or oblong, on long petioles, lamina l£-2£ cm. long. Stem-bracts small, 

 usually 2 or 3 besides that subtending the floral pedicel. Mower solitary, green, with 

 dark-brown coloration about the sinus of the lower lip and apex of the galea. Galea 

 about 13 mm. long, erect, then curved horizontally forward to the tip, terminating in a 

 short acute point. Lower lip erect, the lateral lobes enclosing a rather acute sinus without 

 an inflexed tooth, produced into long slender diverging subulate points on each side of 

 the galea and exceeding the latter. Labellum dark-brown, bluntly ovate, on a movable 

 claw shorter than the column ; lamina about 5 T V mm. long, traversed by a raised central 

 line ; basal appendage rather long, linear, curved, trifid at the end. Column erect, about 

 1 1 mm. long ; upper angle of wings produced into a filiform process ; lower lobe lanceolate 

 with obtuse point and inturned ciliated margin. Stigma elliptical, not viscid. 



N.P. and other parts of Mount Lofty Range ; Beetaloo ; Millicent ; also New South 

 Wales; Victoria: Tasmania. Aug. -Oct. 



7. P. cucullata (hooded), R. Br. Stout, glabrous, often dwarfed, 5-25 cm. high. Leaves 

 crowded at base of scape, sessile or almost so ; oblong, elliptical or obovate. often 7-9 cm. 

 long : passing into 2 or 3 large leaf -like bracts, the uppermost one subtending the floral 

 pedicel, and usually including the ovary and sometimes part of the perianth. Flower 

 large, solitary, glandular-pubescent, the dorsal sepal generally green, the petals labellum 

 and lower lip chocolate. Galea upwards of 3 cm. long ; the tip abruptly decurved in the 

 living plant, very short and acute. Lower lip erect ; the lobes including an acute sinus, 

 shortly acuminate, curved backwards against the sides of the galea but not exceeding 

 the latter. Labellum oblong-elliptical or narrow -elliptical ; the tip very blunt, slightly 

 recurved, on a linear movable claw ; lamina about 14 mm. long, traversed throughout 

 by a central raised line ; basal appendage curved, linear, densely penicillate. Column 

 erect, about 22 mm. long ; upper margin of wings rounded with a short acute tooth ; 

 lower lobe somewhat oblong with blunt tip. Stigma broad, short, ovate-lanceolate or 

 elliptical. 



>,.P. and Mount Lofty Range; Cherry Gardens; McLaren Vale; Millicent; also 

 New South Wales; Victoria; Tasmania. Sept. -Oct. 



8. P. furcata (forked, referring to the points of the lateral sepals), Lindl. A very slender 

 glabrous species, 15-25 cm. high. Leaves 3-5, on rather long petioles inserted at or near 

 the base, gradually passing into large leaf -like stem-bracts ; lamina oblong-lanceolate 

 or elliptical. 2-4 cm. long : stem-bracts usually 2 or 3 (including the one subtending the 

 floral pedicel), loosely sheathing, from 2^4 cm. long. Flower large, solitary, Galea 

 erect, rather narrow, about 4 cm. long from apex to base : tip very acuminate, 

 inclined upwards and slightly forwards. Lower lip markedly cuneate ; lobes including 

 a rather narrow sinus of 70° -80°, tips produced into long iine points embracing the galea 

 and exceeding it. Labellum on a movable claw, oblong-linear with a very blunt slightly 

 recurved tip, rather wider at the base ; lamina about 16 mm. long, a central raised line 

 prominent throughout its length, the margins upturned, transverse section showing a 

 double crescent, thus -^.^ — , ; basal appendage linear, curved, unusually long, densely 

 penicillate. Column erect, much shorter than the labellum, about 17 mm. long : the upper 

 angle of the wings w T ith a short subulate process, the lower lobe blunt linear-oblong 

 ciliate. Stigma rather narrow, oblong-lanceolate. 



Mount Gambier ; Kangaroo Island ; also Victoria and Tasmania. Dec. -Jan. 



9. P. reflexa (bent back), R. Br. Slender, glabrous, from 5-20 cm. high. Leaves cauline 

 at time of flowering, those at lower part of scape reduced to small bracts, gradually 

 increasing in size from below upwards, lanceolate or acuminate, clasping at the base, 

 the longer ones often attaining a length of 4 or 5 cm. Flower green, large, solitary. Galea 

 about 3-2 cm. with the point, gradually incurved, the apex produced into a short but fine 

 point (about 4 mm. long). Lower lip erect ; the lobes separated by a wide sinus, produced 

 into long filiform points embracing the galea and greatly exceeding it. Labellum on a 

 movable claw, nearly straight, lanceolate, tapering to an acute point, when erect slightly 

 exceeding the column ; the lamina about 15 mm. long, traversed by a central raised 

 line ; basal appendage linear, much curved, penicillate. Column erect, about 16 mm. 

 long ; upper angle of wings acute, lower lobe oblong, blunt with inturned ciliated margins. 

 Stigma elliptical. 



N.P. Widely distributed south of Orroroo and reported as far west as Yeelanna ; 

 also from all other States. May-Aug. 



10. P. alata (winy.id), Reich, f. A more slender plant than the preceding, with smaller 

 flowers and more bract-like leaves. Rarely exceeding 15 cm. high. No rosulate leaves 

 at time of flowering ; stem-leaves usually quite small and bract-like, 3 or 4. including 

 the one subtending the floral pedicel. Flower solitary, greyish with reddish-brown 

 striae. Galea erect or gradually incurved ; the apex rather blunt, ending in a very short 

 fine point (about 2 mm.), 22 mm. long including the point. Lower lip erect; lobes 

 separated by a very wide truncate sinus with a notch in the middle, the tips produced into 

 long filiform points embracing the galea and much exceeding it. Labellum reddish -brown 



