42 Mr. Tuckerman, on some Plants of New England. 
owing to the difference in size and shape of the perigynium. 
Our plant, particularly in 6, runs into variations. The spikes 
are sometimes wholly female, with only a few male flowers 
at the top of the highest; and again they are almost entirely 
male. Sometimes the long spreading spikes are crowded toward 
the top, with a somewhat paniculate aspect. All this seems to 
show that the species is with us in a peculiarly developed and 
luxuriant state. 
Acrostis Prcxerineu, (mihi): culmo erecto, foliis planis line- 
aribus, panicula ovata diffusa ramis verticillatis erectiusculis sca- 
bris, glumis subzequalibus subbidentatis, carina inferioris apice 
mucronata superiori acuta glabriuscula, palea inferiori ovato-lan- 
ceolata acuta s. erosa punctatula nervata, superiori exacte ovata 
obtusa enervi, arista e medio dorsi tortili scabra florem bis super- 
ante.—é. rupicola, (mihi): minor panicula contracta glabrius- 
cula, floribus plerumque albo-purpurascentibus. A. canina, var. 
alpina, Oakes, Catal. Verm. p. 32. 
Hab. White Mountains, Great Haystack. (8.) White Moun- 
tains, Pickering and Oakes; Camel’s Rump, Vt. What seems 
the typical state of this plant is a rather tall alpine grass with an 
elegant diffuse panicle.* The variety is a much smaller plant, 
frequently not over three inches high, when it much resembles 
in habit such specimens as I have seen of the European A. 
rupestris. The characters of our plant will not, however, be 
found to agree with those of A. rupestris. It seems even more 
different from A. canina, of which I have good foreign specimens, 
and which is well marked in its habit. 
D. in honorem cl. inventoris, Flore nostree eximii illustratoris. 
A. concernna, (mihi): culmo humili erecto, foliis filiformi-seta- 
ceis, panicula ovata patente glabra, glumis haud zqualibus, infe- 
riori acuta mucronata versus apicem scabriuscula, superiori acuta 
glabra, palea superiori vix ulla, inferiori glabra infra medium 
arista tortili scabra florem superante basique pilis paucissimis in- 
structa. 
Hab. White Mountains; stony alpine moor on Mount Monroe, 
with Carex scirpoidea and Potentilla minima. Somewhat resem- 
bling A. alpina in habit, but that is remarkable for the two bris- 
* T have gathered this on the sandy plain of the Ammonoosuck, where indeed 
Arenaria Greenlandica may also be found; both being doubtless brought down 
from the mountains by the spring freshets. . 
