102 Rhodora [June 
and D. Baker? as to the more northern D. filiformis. 'The New 
Hampshire plant may be called 
DicrrAnrA laeviglumis, n. sp. annua, habitu staturaque ut 
apud D. filiformem; foliis remotis vaginibus glabris vel hirsutis, 
laminis planis glabris 1.5-9 cm. longis, ligula scariosa subtruncata 
erose dentata 1 mm. longa; panicula longe exserta, racemis 2-3 
valde adscendentibus 2-9 em. longis 1-2 mm. latis, rhachi flexuoso 
angulato-filiforme; spiculis 1.8-2 mm. longis ellipsoideis glaberrimis; 
gluma inferiore obsoleta, superiore hyalina elliptico oblengata apice 
rotundata valde 3-nervia; lemmate obtuso 5-7-nervato; caryopsi ellip- 
soidea acuminata atrata puncticulato-striata. 
Annual, with the habit and stature of D. filiformis: leaves remote; 
the sheaths glabrous or hirsute; blades flat, glabrous, 1.5-9 em. long; 
ligule scarious, subtruncate, erose-dentate, 1 mm. long: panicle 
long-exserted; racemes 2-3, strongly ascending, 2-9 cm. long, 1-2 
mm. wide; the rhachis flexuous, angulate-filiform: spikelets 1.8-2 
mm. long, ellipsoid, strictly glabrous: lower glume obsolete; second 
glume hyaline, elliptic-oblong, rounded at summit, prominently 
3-nerved: lemma obtuse, 5-7-nerved: caryopsis ellipsoid, acumi- 
nate, black, puncticulate-striate.—N xw Hampsuire: Manchester, 
rare, September 11, 1901, F.W. Batchelder (rTyP& in Gray Herb.). 
From D. filiformis quickly distinguished by its glabrous spikelet, 
translucent hyaline glume, and truncate erose-dentate ligule; D. 
filiformis having the spikelet pubescent with gland-tipped hairs, the 
opaque glume and lemma ciliate and the more prolonged ligule fim- 
briate-ciliate. As stated, D. laeviglumis is as nearly related to two 
rare species of the sands of Florida, but both D. gracillima and D. 
Bakeri are tall (0.6-1 m.) perennials with very long and slender 
leaves and long racemes (1.5-3 dm. long) and ligules, the former 
species with a very short subtruncate second glume, the latter with 
longer spikelets (2.5 mm.) and with the acute second glume pilose 
at the apex. 
D. laeviglumis is another addition to the already considerable 
list of distinctive plants of the sands of New England which show 
close affinities to or identities with plants of the pine barrens of 
Florida and southern Georgia—such plants as Sagittaria teres Wat- 
son, from which S. isoetifolia J. G. Sm. is scarcely separable; Scirpus 
Hallii Gray, and Sabatia Kennedyana Fernald, nearest related to 
S. decandra (Walt.) Harper (see Ruopora, xviii. 150). That the 
New England Digitaria showing this Floridian relationship should 
1D. Bakeri (Nash), n. comb. Syntherisma Bakeri Nash, Bull. Torr. Bot. Cl. 
xxv. 296 (1898). 
