280 BULLETIN 1772, U. S. DEPARTMENT OF AGRICULTURE. 
what clustered in the axils of the foliage leaves. Species one, in 
the tropical regions of the world. 
Type species: Manisuris granularis Swartz. 
Rytilix Raf., Bull. Bot. Seringe 1: 219. 1830. Rafinesque cites ‘“ Manisuris 
granularis et Myurus Auct.” and lists one species Rytilix glandulosa. The first 
species cited is chosen as the type. 
Hackelochloa Kuntze, Rev. Gen. Pl. 2: 776. 1891. Kuntze restores Manisuris 
to its Linnzean sense and, overlooking Rytilix Raf., proposes Hackelochloa for 
Manisuris Swartz, with H. granu- 
laris, based on Cenchrus granularis, 
as the type. 
Rytili« granularis (L.) 
Skeels (fig. 169) is a tropical 
weed which extends into the 
United States from Florida 
to Arizona. The little pitted 
globose spikelets are very char- 
acteristic. 
Fie. 169.—Rytiliz granularis. Plant, X 2; a single raceme, X 2; two views of a pair 
of spikelets with joint of rachis and pedicel grown together, x 5. 
14. TRIPSACEAE, 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 
