The Flora of the Cayuga Lake Basin 83 



1. Z. aquatica L. (See Rhodora 26: 153. 1924. Z. palusiris of Gray's Man., ed. 7.) 



Wild Rice. 

 Marshes, in rich mucky soil, perhaps influenced by salt springs; infrequent. Aug. 

 Near the mouth of Fall Creek; Inlet Marshes (D.) ; Cayuga Marshes (D.). 

 Ale. to Fla. and La. (?) along the coast, also inland in N. Y. and Mich. 



2. Z. palustris L. (Z. aquatica L., var. angustifolia Hitchc. Z. aquatica of Gray's 



Man., ed. 7, and in part, perhaps, of Cayuga Fl.) Wild RiCe. 



Shallow water ; rare. July-Aug. 



Jennings Pond(?); near the biological field station at mouth of Fall Creek, 

 1919 (R. Hitchcock and A. R. Bcchtcl). 



N. B. to cent. N. Y., Out., and Ind. 



Linder (Rhodora 26: 153. 1924) regards this as a variety of Z. aquatica, but in 

 this region it seems distinct, especially with the added character of long and short 

 branches of the inflorescence. 



Tribe 9. Paniccac 



39. Digitaria Scop. 



a. First empty glume wanting, or minute and scarious ; second one as long as the 

 spikelet ; pedicels subterete, glabrous or nearly so ; leaves 3-6 mm. wide. 



1. D. Ischaemum 



a. First empty glume minute, herbaceous; second one half as long as the spikelet; 

 pedicels angled and scabrous ; leaves 4—10 mm. wide. 2. D. sanguinalis 



1. D. Ischaemum Schreb. (See Rhodora 18:231. 1916. D. humifusa of authors. 



Panicum glabrum of Cayuga Fl.) Low Crab Grass. Finger Grass. 



A weed of lawns, roadsides, and paths, in light or sandy soils ; not uncommon. 

 Aug.-Sept. 



Streets of Ithaca ; many places on C. U. campus ; roads and lawns on Cayuga 

 Heights ; West Hill, Ithaca ; Genoa ; near Lowery Ponds ; and elsewhere. 



N. S. to S. Dak., southw. to Fla. and Kans. Naturalized from Eu. 



A specimen from Cayuga Heights resembles one from Hannibal, Oswego Co., 

 in having denser spikes. 



2. D. sanguinalis (L.) Scop. {Panicum sanguinale of Cayuga Fl.") Crab Grass. 



Finger Grass. 

 A weed of light cultivated soils, roadsides, and waste places ; very common. 

 Nearly everywhere in N. A., except in the extreme North. 



40. Paspalum L. 

 1. P. ciliatifolium Michx. (P. pubescens Muhl., P. Muhlenbergii Nash, P. pubescens, 

 var. Muhlenbergii House.) 

 Low sandy grassland ; rare. Aug.-Oct. 



Bordering the swamp in field e. of Lowery Ponds, 1922 (W. C. Mnenscher and 

 K. M. W.). 



N. H. to Mo., southw. to Ga. and Miss., including the Coastal Plain. 

 The separation of species in Paspalum and Panicum on the basis of degree of 

 pubescence is to be regretted. Fluctuation in pubescence is, at most, of only varietal 

 importance. 



41. Echinochloa Beauv. 

 a. Spikelets ovoid or oval ; upper empty glume not awned ; sheaths glabrous. 



b. Spikelets not conspicuously bristly, the spicules short, slender, and comparatively 

 soft ; midrib of the upper empty glume with very short spicules ; coriaceous 

 flowering glume obtuse (tip withering) ; nodal hairs of the panicle long. 



