pressa, teretia vel subteretia, 2.5-8 mm. longa; rostelli 
lobus intermedius late rotundato-deltoideus. 
Nortuern Ruopesta: Mwinilunga District, just north of dambo to 
north-east of Dobeka Bridge, in Cryptosepalum-woodland on sand, 
Dec. 30th., 1937, Milne-Redhead 3886 (Tyrer). 
Anaota: Moxico District, just south of Lusavo Falls, in Brachystegia- 
Isoberlinia-woodland on sand, Jan. 12th., 1938, Milne-Redhead 4072. 
This, like HZ. decurvirostris Summerh., possesses only 
a single leaf at the base of the scape, but in floral struc- 
ture more closely resembles HZ. ithophila Schlechter than 
Hi. calva Rolfe. From AH. decurvirostris it can be easily 
recognised by the narrower inflorescence, the very long 
and subulate anterior petal- and lateral lip-segments and 
the much stouter and almost straight spur. The structure 
of the column also differs in a number of points, particu- 
larly the anther canals and rostellum side-lobes which in 
H. decurvirostris turn downwards but in AH. wnifoliata 
are slightly curved upwards. 
Habenaria (§. Diphyllae) Edgari Swmmerhayes sp. 
nov. ; affinis H. Mechoww Reichenbach filius, sed foliis 
minoribus, inflorescentiis 2—4-floris nec ultra 5-floris, ped- 
icellis plus duplo longioribus, floribus paulo majoribus, 
petali partitione antica et labelli partitionibus lateralibus 
longioribus, caleari 15-25 em. longo, brachiis stigmati- 
feris brevioribus crassioribus facile distinguenda. 
Herba terrestris, 80-65 cm. alta, fere omnino glabra; 
tubera ovoidea vel ellipsoideo-fusiformia, 2.5—-5 cm. longa, 
1.5-2 em. diametro, subdense tomentosa. Folia 2, basa- 
lia, solo adpressa, transverse elliptica vel suborbicularia, 
apice truncata et emarginata, apice ipso late breviterque 
apiculata, basi breviter vaginantia, 3-3.5 cm. longa, 3-5.5 
em. lata. Scapus erectus, robustus, teres, basi usque ad 
8 mm. diametro, cataphyllis 8-11 foliaceis ovatis acumi- 
natis usque ad 4.5 em. longis et 2.5 cm. latis instructus ; 
racemus 2-4-florus, floribus inclusis 15-25 em. longus; 
[ 278 ] 
