280 BULLETIN 772, IT. S. DEPARTMENT OF AGRICULTURE. 
Species one, in 
what clustered in the axils of the foliage leaves, 
the tropical regions of the world. 
Type species: Manisuris granulans Swartz. 
Rytilix Raf., Bull. Bot. Seringe 1: 219. 1830. Rafinesque cites "Manisuris 
granulans et Myurus Auct." and lists one species Rytilix glandulosa. The first 
species cited is chosen as the type. 
Hackelochloa Kuntze, Rev. Gen. PI. 2 : 776. 1891. Kuntze restores Manisuris 
to its Linnsean sense and, overlooking Rytilix Raf., proposes Hackelochloa for 
Manisuris Swartz, with H. granu- 
lans, based on Cenchrus granulans, 
as the type. 
Rytilix granularis (L.) 
Skeels (fig. 169) is a tropical 
weed which extends into the 
United States from Florida 
to Arizona. The little pitted 
lobose spikelets are very char- 
acteristic. 
Fig. 169. — Rytilix granularis. Plant, X 1 ; a single raceme, X 2 ; two views of a pair 
of spikelets with joint of rachis and pedicel grown together, X 5. 
14. TRIPS ACEAE, THE CORN TRIBE. 
141. Tripsacum L. 
Spikelets unisexual ; staminate spikelets 2-flowered, in pairs on one 
side of a continuous rachis, one sessile, the other sessile or pedicellate, 
similar to those of Zea, the glumes firmer ; pistillate spikelets single 
