482 MR. H. BOLUS'S CONTRIBUTIONS 
Labellum ovate, incurved at the sides ; gland of pollinia broader 
PMA TUNE C aL ERR ESI CAR 2. D. purpurascens. 
Labellum lacerate. 
Spike 2-4-flowered ; flowers nearly white. 3. D. barbata. 
Spike 3-6-flowered ; flowers blue, labellum white. 
4. D. venusta. 
Spike 10-15-flowered ; flowers purplish, labellum green. 
5. D. lugens. 
Disa ($ HERSCHELIA) PURPURASCENS, DBolus,n. sp. D. labello 
ovato crenulato, marginibus inflexis ; glandula polliniorum latiore 
quam longa. 
Glabra erecta 1-12 pedalis; tubera oblonga vel obovata; 
folia 6-8 omnia radicalia linearia graminoidea laxa 20-22 cm. 
longa, basi fibris foliorum delapsorum cincta ; scapus flexuosus, 
vaginis membranaceis acutis ; spica laxe 2-flora, bracteis late 
ovatis acutis membranaceis ovario multo brevioribus; sepala 
lateralia ovato-oblonga acuta patentia, 1°6 cm. longa; galea ore 
depresso subrotundo 1:5 cm. lato, subacuta, calcare conico ad- 
scendente 0*4 cm. longo praedita ; petala lateralia medio linearia 
apice dilatata dentata basi oblonga subpatentia crenulata columns 
adnata 1:1 em. longa; labellum 1:6 em. longum; anthera deflexa, 
glandula oblonga; rostellum breve. (v. v.) 
In convalle montis Muizenberg in Peninsula Capensi * Farmer 
Peck’s Valley ” dicta, juxta rivulum, alt. 1100 ped., duas plantas 
inveni, die 24 Nov. 1883. Herb. propr. No. 4893 ! 
The colour of the flowers is a blue-purple, except the upper 
part of the petals and the spur, which are pale yellow ; anther- 
cells pink. 
This is very near D. graminifolia, Ker, but differs by its nar- 
rower and more acute side sepals, its more erect side petals; the 
shape of its labellum (which lies straight as to its length with 
its margins inflexed, like a shovel, while in D. graminifolia the 
margins are always straight, but as to its length it is reflexed), 
and finally by its shorter rostellum and gland. The flowering- 
season of the two species is Separated by an interval of two 
months, an important circumstance as showing that the two plants 
are not complemental forms of the same species, which I should 
otherwise have thought probable. 
Disa (§ HERSCHELIA) VENUSTA, Bolus,n. sp. Spica 3-6 flora ; 
floribus ezruleis ; labello lacerato albo. 
