Revision of Petrocosmea. 
BY 
WILLIAM GRANT CRAIB, M.A., 
paetipees on Forest Botany and Indian Forest Trees 
n the University of Edinburgh. 
THE genus Petrocosmea was originally described by Oliver * 
in 1887 from Dr. Henry’s Ichang collections. , Eight years later 
Hemsley + added another species—P. grandiflora—which was 
collected at Mengtze by Hancock. These two species—P. 
sinensis and P. grandiflora—agree in the lobing of the corolla limb. 
Although the limb is distinctly bilabiate, yet the five lobes are 
of subequal dimensions. In 1899 Hemsley { added two more 
species—P. iodioides, collected at Mengtze by both Hancock 
and Dr. Henry; and P. minor, collected also at Mengtze by Han- 
cock. In these two species the posticous lip is very much shorter 
than the anticous, and for their reception Hemsley created a 
new section which he callefl Anisochilus. In 1911 two species 
were added by Léveillé §—P. Cavaleriet and P. Martinit,—both 
from Kouy-Tcheou, and in 1915 the same author || described 
P. Mairei from Maire’s Yunnan plants. In rg18 the present 
writer § described another Mengtze species—P. Hemryt. At 
this time the genus was confined to Hupeh, Kouy-Tcheou, and 
Yunnan, but last year the genus was recorded ** from N. Siam, 
where Dr. Kerr collected P. Kerrit. Thus at the present time 
the genus consists of 9 species—8 Chinese and 1 Siamese. In 
this contribution six more species are added—all from China. 
KEY TO THE SPECIES. 
Lips of corolla of subequal length, the eeyres not clasping the style 
(§ Eupetr dg ee raib. 
Filament and connective hirsute. : ‘ ae 5 grandiflora. 
Filament and connective glabrous. 
* Oliver in Hook., Ic. Pl., xviii, t. 1716 (1887). 
+ Hemsley in Hook., Ic. Pl., xxv, t. 2410 (1895). 
+ Hemsley in Hook., Ic. Pl., xxvi, tt. 2599, 2600 (1899). 
§ Lévl. in Fedde Rep. Nov. Sp., ix, p. 329 (T9I1). 
|| Lévl. in Bull. Acad. Geogr. Bot., 1915, p. 24. 
ah Craib in Notes Roy. Bot. Gard. Edin., x, p. 216 (1918). 
* Craib in Kew Bull., 1918, p. 365. 
gin Ca Edin., No. LV, November 1919.] F 
