2 
The standard species of the genus Coelorrhachis as understood here 
is C. muricata, Brongn. in Duperry, Voy. Coquille, Bot. vol. 1. p. 65, 
t. 14 (1829), which in 1833 was redescribed independently in Mém. 
Acad. Petersb. ser. 6, vol. ii. p. 250 as Coelorrhachis glandulosa, Trin. 
Coelorrhachis comprises twelve species, six of which are confined to the 
tropics of the Old World, and as many are found exclusively in the 
New World. Of the Rottboelliae of Hackel’s monograph the species 
numbered 17-27 belong here, with the exception of 20, 22 and 23, 
which might more appropriately constitute a distinct American 
genus, ranging from the central and southern United States to 
Brazil.—O. Srapr. 
Fic. 1, part of raceme, front view; 2, same in back view; 3, upper glume ; 
4, valve of lower floret ; 5, valve of upper floret ; 6, valvule of same (2-6 of sessile 
spikelet). All enlarged. 
