148 ORCHID ACEAE. 19. Pterostylis. 



Lobes of lower lip with long points, exceeding galea ; 



tip of galea elongate, acute, slightly inflexed or 



incurved ; leaves petiolate P. furcata 8. 



Leaves at lower part of scape reduced to scales or small 



bracts, gradually increasing in size to larger linear or 



lanceolate bracts or leaves from below upwards ; 



lobes of lower lip produced into long fine points. 

 Labellum acute, lanceolate ; galea 3 cm. or more long ; 



upper leaves fairly well developed, lanceolate P. reflexa 9. 



Labellum acute, linear-lanceolate ; galea greyish with 



dark striae, less than 1\ cm. long ; upper leaves 



small, often bract-like P. alata 10. 



Labellum very blunt, linear-oblong ; galea from 



2-2£ cm. long; upper leaves small, often bract-like. . P. obtusa 11. 

 Radical leaves not developed during flowering stage, or 

 sometimes represented by a small lateral tuft at base of 

 scape ; no stem-leaves except a few small bracts ; 

 flowers usually 2 or more, rarely 1, small ; galea less 

 than 10 mm. long ; sepal points very short P. parviflora 12. 



Section 2. 

 Lower lip reflexed against the ovary spreading or recurved ; 

 its lobes acuminate, or prolonged into fine or linear 

 points, or hardly acute and not produced. 

 Flower always solitary, large, galea about 3 cm. long ; 



labellum filiform with long hairs P. barbata 13. 



Flowers multiple, small, spicate ; galea about 7 or 8 mm. 



long ; sepals rather blunt, not produced ; appendage 



conspicuous, nearly as long as labellum ; leaves in a 



basal rosette. 



Plant very slender ; basal appendage of labellum bent 



backwards P. mutica 14. 



Plant rather stout ; basal appendage of labellum bent 



forwards P. cycnocephala 15. 



Flowers generally multiple and usually fairly large, rarely 

 quite small ; appendage of labellum almost obsolete ; 

 lateral sepals acuminate or prolonged into fine points 

 (caudae). 

 Leaves in a basal rosette. 



Flowers 1-4, quite small, galea 7 or 8 mm. long ; 

 lateral sepals acuminate, not caudate ; labellum 



fleshy, tip straight ; leaves green P. pusilla 16. 



Flowers rather large, galea 10-15 mm. long ; sepals 

 caudate. 

 Labellum membranous, tip upturned ; stem-bracts 



few ; rosette withered P. rufa 17. 



Labellum fleshy, tip upturned ; stem-bracts 



many ; rosette withered P. squamata 18 



Labellum fleshy, tip depressed ; stem -bracts few ; 



rosette green P. Mitchellii 19. 



Leaves cauline, lanceolate, without basal rosette ; 

 lateral sepals with short acute tips. 

 Flowers green, slightly inclined away from floral 

 axis ; lower lip narrow ; column slightly incurved, 

 wings almost square ; stigma long and narrow .... P. longifolia 20. 

 Flowers green with many dark rufous markings, 

 nodding ; lower lip very wide ; column extremely 

 incurved, wings with oblong lower lobe ; stigma 

 widely ovate-cordate P. vittata 21. 



1. P. concinna {neat), R. Br. Slender, glabrous, 4-15 cm. high. Leaves in a basal 

 rosette, on fairly long petioles ; lamina ovate or oblong-ovate, about l£-2^ cm. long. 

 Flower solitary, green with brown points sinus and labellum. Galea light-green with 

 darker longitudinal stripes, about 15 mm. long, at first erect, then curved horizontally 

 forward, its tip acute, depressed. Lower lip erect, its lobes including a very wide sinus 

 and produced into erect fine points about 15 mm. long on each side of galea. Labellum 

 on a linear claw attached to the projecting foot of the column, oblong, acutely emarginate, 

 about 8 mm. long (including claw) ; penicillate appendage slender, curved forward, the 



