244 BOTANICAL GAZETTE [MARCH 
SCHLECHTER,’ in monographing the tribe Thismieae of Burmanniaceae, 
recognizes ten genera, the following two being new: Scaphiophora and Triuro- 
codon. 
PERKINS,* in monographing the African species of Pycnostachys (Labiatae), 
recognizes 33 species, 8 of which are new. The same author has also mono- 
graphed the African species of Achyrospermum (Labiatae), recognizing 12 
species, 3 of which are new. 
ROWN,’ in naming a collection of plants from southeastern Congo, 
Rhodesia, and South Africa, has described 30 new species, and also a new 
genus (Alistilus) of Leguminosae. 
IELS,’ in continuation of his investigation of the flora of Micronesia, has 
published the following families: Myrtaceae, Myrsinaceae, Elaeocarpaceae, 
Asclepiadaceae, Scrophulariaceae, and Gesneraceae.—J. M. C. 
Citrus diseases in the Orient.—The study of citrus diseases in the Orient 
is of particular interest and importance since most of our cultivated citrus 
fruits undoubtedly had their origin in this region. REINKING’s? recent paper 
therefore, is timely and interesting. A description of the diseases, a discussion 
of the causal organism, and suggestions regarding the control measures proper 
for each is given. A summary showing the citrus varieties found in each coun- 
try, with the diseases to which they are subject, is given, also a list of scale 
insects and fungi parasitic on scales. Fourteen good plates, devoted chiefly 
to illustrating citrus canker (Pseudomonas citri), bark rot (Diplodia), and 
pink disease (Corticium salmonicolor) complete the article. The two latter 
diseases, occurring in the Philippines and unknown in the United States, are 
apparently of major importance, warranting every precaution against their 
spread or introduction into new territory. A “black spot’? disease occurring in 
South China, of unknown cause, is also regarded as serious. 
Particular attention is given to the degree of susceptibility to citrus canker 
shown by different species, hybrids, and relatives of citrus planted out at Los 
Banos, Philippine Islands. Observations of this character have an important 
bearing on the selection of material for culture in regions exposed to canker 
’ SCHLECTER, R., Die Thismieae. Notizblatt Bot. Gart. u. Mus. Berlin-Dahlem. 
8:no. 71. Ailag 1921. 
, Janet, Die afrikanischen Pycnostachys-Arten. Notizblatt Bot. 
Gart. u. ie Berlin-Dahlem. 8:no. 71. 63-77. 1921; Die afrikanischen Achyro- 
spermum-Arten. Ibid. 78-82. 
7 Brown, N. E., New plants ae aeagee = pi Africa collected by Arch- 
deacon F. A. Ro OGERS. Kew Bull. 
Diets, ©; ecg zur Ho von polite und Polynesien. II. Engler’s 
Bot. Jahrb. 56: plas 
9 REINKING, Orto A., o s diseases of the oe South China, Indo- 
China, and Siam. Philippine Aeadtes 9:12I-170. 
