OPHRYDEjE— GYMN AD ENIIN^— PL AT ANTHER A 133 



Orchicaloglossum mix turn by Ascherson and Graebner,i and Orchicaloglossum Dominianum 

 by Camus. ^ 



Habitat. Chalk downs, rarely in fields. V.R. 



Distribution abroad. Riesengebirge, E. Prussia (one specimen), Bohemia, 

 France (Masseube), where the only specimen found resembled a large and superb 

 0. maculata. The habit of British plants is nearer that of C. viride. Although both 

 parents were abundant at Sils Maria, in the Engadine, I could find no hybrid. 



Genus XIV PLATANTHERA Rich. 



Anther united with column, open at apex, cells parallel or divergent downwards. 

 Pollinia stalked. Viscidia round or oval, naked, without pouch, placed laterally in 

 the flower, facing each other, attached to the side of the caudicles, not to the tip. 

 Small or medium-sized herbs with the habit of Orchis. Tubers undivided, tapering. 

 Stem erect. Leaves unspotted, in our species two (rarely three), near base, broad, 

 upper 2-4 bract-like. Spike loose, many-flowered, flowers of medium size, wliite, 

 sweet-scented. Side-sepals spreading, upper sepal and petals forming a shallow arch 

 protecting the column. Lip undivided, strap-shaped, spur (in our species) long, 

 slender with free nectar. 



PLATANTHERARich., M/;9/. Ai?^j-. Ptfm, IV, 48 (1818). OrchisL. (1753). Habe- 

 NARiA R. Br. in part (1809). 



KEY TO SPECIES 



1. Pollinia sloping backwards, divergent downwards, 4 mm. long, caudicle longer 



than pollen-mass. Viscid discs, large, circular, ± 4 mm. apart. Anther flat, 

 truncate above. P. chlorantha 



2. Pollinia vertical, parallel, about i mm. apart, caudicle shorter than pollen-mass. 



Viscid discs small, oval, i mm. apart. Anther folded vertically forwards, like 

 an inverted letter U in horizontal section. P. bifolia 



I. PLATANTHERA CHLORANTHA Rchb. p. 



PI. 24 (p. 134). Greater Butterfly Orchid 



Tubers two, entire, tapering downwards, obtuse, sometimes tailed ; roots few, stout, 



brown. Stem 20-40 cm. tall (up to 60 cm. abroad), erect, rigid, robust, solid, angled 



or ridged above through decurrence of the mid-ribs and edges of the bracts and 



' Sjn. Ill, 847 (1907). 2 Mon. Orch. Eur. p. 322 (1908). 



