276 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
spikelet closely appressed to the hollow of the rachis, 4 mm. long, nearly 2 mm. 
wide, sometimes two borne on a joint, the slender pedicel of the sterile spikelet 
lying between their inner margins; first glume acute, smooth, depressed across 
the base before maturity, not reticulate, pitted, nor winged ; second glume nearly 
as long as the first, acuminate; sterile lemma hyaline, the fertile lemma and 
palea much reduced; pedicel of sterile floret relatively slender, the minute 
sterile spikelet reduced to two glumes. 
Type in U, S. National Herbarium, no, 950205, collected in pine barren, San 
Juliin, south of Guane, Province of Pinar del Rio, Cuba, December 27, 1916, by 
Brother Leén (no. 6981). 
In the rather frequent presence of a pair of sessile fertile spikelets at a 
joint, this species departs from the arrangement typical in Manisuris, an ar- 
rangement known in but a single anomalous species of the Philippines, Rott- 
boellia triflora Hubbard, belonging to the same group. The above description is 
drawn from the single specimen cited. It is possible the pair of spikelets is an 
individual variation. 
5. Manisuris aurita (Steud.). 
Rottboellia aurita Steud. Syn. Pl. Glum. 1: 361. 1854. 
Tall, like M, impressa, the erect branches with numerous slender racemes 6 
to 10 cm. long, the first glume marginate and winged above, foveolate or pitted 
on the back. 
Grassy hillsides, Brazil, whence originally described, to Trinidad; in the 
latter locality known from a specimen in the Gray Herbarium collected by 
Finlay. 
9. RYTILIX Raf. 
Sessile spikelet perfect, the first glume globose, indurate, alveolate, the 
adnate rachis joint and pedicel fitting into the opening of the glume; pedicellate 
spikelet relatively large, sterile. 
1. Rytilix granularis (L.) Skeels, U. S. Dept. Agr. Bur. Pl. Ind. Bull. 282: 
20. 1913. 
Cenchrus granularis L. Mant. Pl. 575. 1771. 
Manisuris granularis Swartz, Prodr. Veg. Ind. Oce. 25. 1788. 
Rytilir glandulosa Raf. Bull. Bot. Seringe 1: 219, 1830. 
Hackelochloa granularis Kuntze, Rev. Gen, Pl. 2: 776. 1891. 
A coarsely hispid, freely branching annual with flat blades and numerous 
terminal and axillary racemes 1 to 2.5 em. long. 
A common weed throughout tropical America, introduced from the Old World. 
Originally described from the East Indies. In the West Indies found on the 
larger islands and south to Martinique. 
10. TRACHYPOGON Nees. 
Perfect spikelet awned, pedicellate, the pedicel disjointing obliquely, form- 
ing a sharp callus below the spikelet; staminate spikelet subsessile, persistent 
on the slender continuous rachis; racemes solitary or few to several, digitate. 
Awn 10 to 12 cm. long, conspicuously plumose________._-§ 1. T. gouini. 
Awn mostly not over 5 cm, long, appressed-plumose on the lower part, scabrous 
above. 
Blades involute ; racemes usually solitary on the culms_____ 2. T. filifolius, 
Blades flat; racemes usually 2 or 3, sometimes solitary____8. T. plumosus, 
