422 
from that species. No. 222, Robinson and Schrenk, 1894, and 
Macoun’s plant, collected at Windsor, N.S., June 29, 1883, be- 
long here. 
PANICUM SPHAGNICOLUM n. sp. Culms 2°—3° long, at first 
simple, later repeatedly dichotomously branched, the branches 
very divergent. Primary sheaths hirsute, those of the branches 
glabrous; ligule a ring of short hairs; leaves smooth and glabrous, 
the primary 2/-3% long, 2’’-5’” wide, those of the branches é 
long or less, %4/’-114” wide, appressed ; primary panicle about 2 
in length, the branches 1%4’-1’ long, spreading; secondary pan- 
icles about 14’ long, raceme-like; spikelets 11/’” long, few and 
appressed, pubescent; first scale ovate, acute, I—3-nerved, about 
half the length of the spikelet; second scale broadly ovate, 
7-nerved, somewhat shorter than the 7—9-nerved third one, the 
fourth chartaceous, smooth, elliptic, acute, slightly exceeding 1 
in length and equalling the third. 
The late and much branched state was collected by the writer 
this summer in a sphagnum bog at Lake City, Florida, and will 
be distributed as No. 2500. The main stem rises through the 
sphagnum and then divides dichotomously, the branches spread- 
ing. out over the surface of the moss, the ends being erect. The 
early and simple form was found by A. W. Bitting in a cypress 
swamp at the same place, on April 2, 1892. 
IXOPHORUS Schlecht. Linnaea, 31: 420. 1861-62. 
[SerariA Beauv. Agrost. 113. 1812. Not Ach. 1798.] 
Otto Kuntze (Rev. Gen. Pl. 767) has referred these grasses to 
the genus Chamaeraphis R. Br., and this disposition of them has 
been accepted by several writers. But Chamaeraphis 1s a tropical 
genus in which the spikelet and bristle fall attached, while in the 
plants in question the spikelet articulates above the bristles, hence 
‘leaving them persistent when it falls. Feeling confident that the 
two groups are generically distinct, I have sought for a published 
name for the latter, and find /xophorus of Schlechtendahl to be the 
earliest one available. It is based on Uvochloa uniseta Presl, which 
is Se¢aria uniseta Fourn. The forms occurring in the northeastern 
United States are as follows: 
1.“ IXOPHORUS VERTICILLATUs (L.). 
Panicum verticillatum L. Sp. Pl. Ed. 2, 82. 1762. 
Setaria verticillata Beauv. Agrost. 51. 1812. 
