TAB. 86. 



Tribe Ophrydeae. 



Sub-tribe Diseae. 



Genus Disa. 



Disa purpurascens, Bolus, in Jonm. Linn. Soc. {Bot.), vol. xx, 

 p. 482 (1884). — (i Herschelia). — Herba glabra erecta, 1-li-pedalis ; 

 caulis strictus vel siibflexuosus rigidus apbyUus, vaginis membranaceis 

 adpressis iuternodiis brevioribus vestitus ; folia radicalia 6-8, erecto- 

 pateutia linearia graminoidea acuta rigida, per antbesin marcescentia, 

 caule multo breviora ; racemus laxe 2-3 fl., bracteis ovatis acutis mem- 

 brauaceis, ovario subaequilongis ; sepala lateralia patenti-deflexa ob- 

 longa acuta, 1*8 era. longa ; sepaluiii impar cucullatum, ore sub- 

 orbiculari, l'4-l-6 cm. diametro, subacutum, calcare adscendente 

 obtuso, circa 4 mill, longo ; petala sub galea inclusa supina subdolabri- 

 formia apice rotundata denticulata, basi ampliata columnae adnata ; 

 labellum patens ovatum cuspidatum plus minus crenulatum, margine 

 inflexo ; antbera resupinata, glandula pollinium unica transverse ob- 

 longa ; rostellum 3-lobum ; ovarium gracile decurvum. {Ex exempli, 

 plur. viv.) 



Hab : South-western Region ; C.vpe Coloxy : by streams on tbe 

 Muizenberg, Cape Peninsula, alt. 330 meters, fl. Nov., Bohis, No. 4893; 

 from there along tbe bills southward nearly to Cape Point, various 

 collectors. 



Plate 86. Fig. 1, one of tbe side sepals; 2, odd sepal, — natural 

 size ; 3, lip, spread out by hand, magnified 2 diameters ; 4, 5, column 

 with petals and part of the ovary ; 6, one of the petals ; 7, pollinarium, 

 viewed from behind ; 8, part of leaf, upper surface ; 9, ditto, under 

 surface; 10, section of leaf; 11, rostellum after removal of the polli- 

 narium, the stigma cut through in front, — figs. 4-11 variously mag- 

 nified. 



A glabrous erect herb, 1-1 J ft. high ; stem straight or sub- 

 flexuous rigid leafless, clothed with membranous appressed 

 sheaths shorter than tbe internodes ; leaves radical 6-8, erect- 

 spreading linear grass-like acute rigid, withered during flowering, 

 much shorter than the stem ; raceme laxly 2-3-fl., bracts ovate 

 acute membranous, about as long as the ovary ; side sepals 

 spreading-deflexed oblong acute, 1'8 cm long ; odd sepal hooded, 



