Ischemum.] GRAMINE A! 1195 
of upper spikelets trigonous, hollowed ventrally ; spikelets 2-nate, 
one sessile, one pedicelled, each often 2-flowered, a male an 
female or 2-sexual, deciduous with the internode, the pea 
spikelet usually dissimilar from the sessile, sometimes conform 
Sessile spikelet: glumes 4; I. and II. subequal, coriaceous or 
papery, awnless or II. ends I. ov void. oblong or oblong-lanceolate, 
convex, with smooth sides, more or less nodose below the middle 
and more or less marginally winged and veined above it, the sides 
broadly or narrowly incurved, II. lanceolate, eae concave ; 
TI. nearly as long as I., usually membranous, acute or acuminate, 
with a narrow, lanceolate, acuminate, 2-veined ‘ithe. usually 
centrally opaque and rigid ma mame with oe inflexed, 
ine wings, 3-an empt deeply 
3 2-cleft, 3-veined, awned, the awn peniowiagey's oa or nearly so, 
i with a brown, twisted column, dorsally inital at ey sinus ; 
palea narrow, hyaline ; lodicules ener or quadrate ; sta 
3; anthers linear ; styles long; stigmas short. Pedicelled se 
let with pedicel half as long as sessile spt or shorter ; glume 
I. often dimidiate-ovate, flattened and wide-winged; glume IV. 
usually oblong, obtuse or minutely 2-lobed, very rarely awned. 
Grain free. 
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“Spikes 2-3, rarely more; veins of glume I. obscure :—[p. 1 
Margins of glume I. narrowly inflexed or incurved mt base to 
apex :— 
Leaves rounded at the base :— 
Pedicel of the upper spikelet less than one-third the length of the 
lower spikelet ; base of stem not woolly :— 
Glume I. of sessile spikelet with nodul 
aristotuie + subsp. imberbe. 
Glume I. of sessile spikelet closely, transversely ridged 
: rugosum. 
; Pedicel of the upper spikelet more than one-third the length of 
4g the lower spikelet ; base of stem woolly .........-..++ angustifolium, 
: Leaves broad, hastate or deep cordate at the base :— 
4 ume I. of sessile spikelet glabrous ........-+:+..0++ semisagittatum. 
" Glume 1. of sessile spikelet villous con) jugatum 
es of glume I. of sessile spikelet broadly incurved below 
middle ; 
Keel of glume II. winged above the middle ciliare 
Keel of glume LL. not winged :— 
