410 Key to the System of 



BXXCROTIS. 



1778. Flowers variously small, but never minute. 



Hardly dwarf, very slender ; flowers light-green ; bracts 

 very short ; fruit quite short, obovate-ellipsoid. 



M. porrifolia. 



Flowers always very minute. 



Very dwarf ; remarkably slender ; flowers yellowish-green,, 

 only through decay or exsiccation blackish ; bracts ex- 

 tremely short ; fruit minute. 



(M. atrata.) M. minutiflora. 



DIURXS. 



1779. Petals lilac-colored. 



Tubers thick, occasionally bilobed ; basal leaves broad- 

 linear, channelled, usually two ; rudimentary leaves one 

 to three, almost bract-like ; flowers five or less, rarely 

 reduced to one ; bracts conspicuous ; lower, lobes of 

 the calyx much longer than the labellum, greenish or 

 somewhat brownish ; petals spotless, narrowed into a 

 stalk-like base ; middle lobe of the labellum semiorbicular- 

 rhomboid, with two longitudinal white but purplish- 

 dotted narrow elevations towards the base ; lateral lobes 

 much shorter ; fruit slightly turgid. 



(D. elongata.) D. pimctata. 



Upper calyx-lobe and petals white or yellowish or 

 somewhat brownish... ... ... . . ... 1780 



1780. Upper calyx-lobe and petals white. 



Tubers thick, occasionally lobed ; basal leaves usually two> 

 broad -linear, channelled ; rudimentary leaves two or three,, 

 bract-like ; flowers generally two or three ; bracts con- 

 spicuous ; lower lobes of the calyx much longer than the 

 labellum, greenish and somewhat brownish ; petals spot- 

 less, narrowed into a stalk-like base ; middle lobe of the- 

 labellum more than twice as long as -the lateral lobes, 

 often slightly pink, almost rhomboid, with two narrow 

 dotted elevations towards the base ; lateral lobes some- 

 what indented ; fruit slightly turgid. (Possibly a variety 

 of the former.) D. alba. 



Upper calyx-lobe and petals yellowish or somewhat 

 purple-brownish ... ... ... ... ... 1781 



