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BOTANICALMUSEUM LEAFLETS 
HARVARD UNIVERSITY 
Campripcr, Massacunusetts, Ocroper 23, 1945 VoL. 12, No. 3 
AFRICAN ORCHIDS XVI. 
BY 
V. S. SUMMERHAYES 
(Royal Botanic Gardens, Kew) 
A SUGGESTED re-classification of the genus Diapha- 
nanthe Schltr. together with descriptions of new species 
and new combinations in the genus form the greater part 
of this contribution. There are also descriptions of new 
species of other genera of Angraecoid orchids and of one 
species of Polystachya. The sequence, as in previous con- 
tributions, is that of Schlechter’s ‘‘Das System der Or- 
chidaceen’’ (Notizbl. Bot. Gart. Berlin, 9 (1926) 563- 
591). The type specimens of all the new species are in 
the Kew Herbarium. 
Polystachya (§ Cultriformes) canaliculata Sum- 
merhayes sp. nov.; a P. fulvilabia Schltr. foliis angusti- 
oribus, inflorescentiis foliis multo brevioribus, floribus 
albis nec flavis, sepalis obtusis vel apiculatis, labelli ungue 
brevi, lobo intermedio ruguloso canaliculato; a P. Mild- 
braedu Kraenzl. mento breviore, labello basi magis an- 
gustato lobis lateralibus minoribus lobo intermedio ru- 
guloso satis distinguenda. 
Herba epiphytica; caules caespitosi, erecti, usque ad 
12 cm. alti, leviter ancipites, siccitate sulcati, apice mono- 
phylh, basi cataphylla vaginiformi lineari acuta usque ad 
7.5 em. longa instructi. Foliwm erectum, lineari-ligula- 
tum, apice rotundatum, basi cuneatum, 9—25 cm. longum, 
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