s long as the first, linear, dorsally chartaceous, with
broadly incurved membranous margins, 3-nerved. The third glume is very
small, hyaline, 1-nerved, epaleate. The fourth glume is the flattened
base of the awn, epaleate. The lodicules are two, cuneate. Anthers are
rather small. Styles are laterally or terminally exserted. Grain is
narrow, obovoid, biconvex, with two grooves on the anterior side and
with a long embryo.

=Anthistiria tremula, _Nees_=.

This is an annual or perennial. Stems are stout or slender, erect or
ascending from a creeping root-stock, simple or branched, 1 to 4 feet.

The _leaf-sheath_ is smooth, compressed. The _ligule_ is a narrow
membrane.

The _leaf-blade_ is linear-lanceolate, rigid, erect, acuminate with a
setaceous tip, nearly smooth, varying in length from 6 to 20 inches and
in breadth from 1/6 to 2/3 inch.

The _inflorescence_ is an elongate panicle, 1 to 2 feet long, consisting
of rather distant fascicles of spikes and bracts on capillary, flexuous
peduncles; the spikes are sub-flabelliform or sub-globose, 1/2 to 1-1/2
inches broad, sometimes reduced to a few spikelets and bracts; the outer
bracts are longer than the fascicles, 1 to 1-1/2 inches long, glabrous
or hairy with ordinary or tubercle-based hairs; proper bracts are
lanceolate, acute, compressed, glabrous or hairy with membranous
margins.

[Illustration: Fig. 165.--Anthistiria tremula.

1. Fascicles of three spikes with the outer bracts and proper bracts; 2.
a spike without its proper bract; 3. the pedicelled and the bisexual
spikelets without the involucral spikelets; 4, the first glume of the
involucral spikelet with one wing only; 4a. the first glume of the
involucral spikelet with wings to both the keels; 5 and 6. the second
and the third glume of the involucral spikelet; 7, 8 and 9. the glumes
of the bisexual spikelet; 10, 11, 12 and 13. glumes of the bisexual
spikelet; 14. ovary.]

The _involucral spikelets_ are the longest, in contiguous superposed
pairs, about 1/2 inch long, and the rachis of the spike is produced
beyond these spikelets. There are three _glumes_. The _first glume_ is
linear-lanceolate, acute, covered with long, often tubercle-based hairs,
many-nerved, margins narrowly incurved, and with narrow wings, on both
the keels in one of each of the pairs of spikelets and on one keel only
in the other of each of these pairs. The _second glume_ is
oblong-lanceolate, acute, margins thin and membranous,