272 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
52. LITHACHNE Beauv. Ess. Agrost. 135. pl. 24. f. 11, 1812. 
1. Lithachne pauciflora (Swartz) Beauv.; Poir. Dict. Sci. Nat. 27: 60. 1823. 
Olyra pauciflora Swartz, Prodr. Veg. Ind. Occ. 21. 1788. 
Type locality, ‘‘Jamaica.’’ 
Rance: Mexico, Central America, and West Indies. 
HERBARIUM SPECIMENS FROM MEXICco: 
VERACRUZ: Colipa, Liebmann 269. Cérdoba, Hitchcock 6447. Zacuapan, Purpus 
6221. 
53. RADDIA Bertol. Opusc. Sci. Bologna 3: 410. 1819. 
1. Raddia strictiflora (Fourn.) Chase, Proc. Biol. Soc. Washington 21: 185. 1908. 
Strephium strictiflorum Fourn. Bull. Soc. Bot. Belg. 15: 465. 1876. 
Type locality, ‘Arroyo Sellero,’? Mexico, the type specimen collected by Kar- 
winsky (no. 1478). . 
RanGE: Gulf region of Mexico. 
HERBARIUM SPECIMENS: 
VERACRUZ: Lacoba, Liebmann 264 in part. Hacienda de Jovo, Liebmann 267. 
54. PHARUS L. Svst. Nat. ed. 10. 1269. 1759. 
KEY TO THE SPECIES. 
Culms erect. .-. 22.222... cece ee ee cence eee 1. P. glaber. 
Culms creeping at base and rooting at the nodes.................. 2. P. parvifolius. 
1. Pharus glaber H. B. K. Noy. Gen. & Sp. 1: 196. 1816. 
Type locality, ‘‘in temperatis, opacatis Provinciae Novae Andalusiae, prope coeno- 
bium Caripense.”’ 
RanGE: Mexico and West Indies to South America. 
HERBARIUM SPECIMENS FROM MEXICO: 
San Luis Porosi: Barranca of Las Candas, rich woods, Pringle 3990. 
VERACRUZ: Mirador, Liebmann 258. Zacuapan, Purpus 6214. 
2. Pharus parvifolius Nash, Bull. Torrey Club 35: 301. 1908. 
Type locality, ‘‘Les Roches, a few miles to the west of Plaisance, Haiti,’’ the type 
specimen collected by Nash and Taylor (no. 1482). 
Rance: Veracruz, West Indies, and Central America. 
HERBARIUM SPECIMENS FROM MEXICO: 
Veracruz: Sanborn, Orcutt 3236. 
55. LUZIOLA Gmel. Syst. Nat. 636. 1791. 
1. Luziola peruviana Gmel. Syst. Nat. 637. 1791. 
Type locality, Peru. 
RANGE: Mexico to Uruguay. 
HERBARIUM SPECIMENS FROM MExIco: 
Jatisco: Guadalajara, shallow water, Pringle 3867. 
MExico: Tlalnepantla, wet places, Pringle 11227. 
TaBasco: Bank of Gonz4lez River, Rovirosa 555. 
56. HOMALOCENCHRUS Mieg. Act. Helv. Phys.-Math. 4: 307. 1760. 
KEY TO THE SPECIES. 
Panicle contracted, the branches ascending, spikelet-bearing from 
near the base..-. 2... 22.2. eee cece eee ee eee eee 1. H. hexandrus. 
Panicle open, the branches slender, spreading, 10 cm. or more 
long, naked below. 
