46 POACEAE 
glabrous. [A. virginicus stenophyllus Hack.]—Wet pinelands, Fla.—The le af 
blades of the innovations are often solid, the upper surface being obliterated. 
15. A. brachystachys Chapm. Stem 1-1.5 m. tall: spathes in ong in- 
igi not usu pap inflated, the Ra ON of the spathes sender, often 
ex acemes in pairs, u usually about 1 cm. long, Put pas n peduncle 
sone s pore from the spathe: sessile Berne abou t long, the 
awn less than 1 em. long, sometimes wanting.—Moist de la. 
16. A. Hlliottii Chapm. Stem e i : a m. tall: jn ae ao or ne villous, 
the upper inflated and aggregat es in pairs, 3-4 ¢ ong, S of the 
pedicels exserted from the “appressed cade e and irum the ped Hope more 
or less ineluded i 2 inflated u upper pec sessile D t 4-5 mm. long, 
the iie 10-15 m ong, ME e and twisted.—Pinelands, prairies, rocky 
hills, open dry grounds and old o. Coastal "Plain End occasiona ally adj. prov- 
inces, Fla. to E Tex., S Mo., and Pa.—(Mez.) —The inflat ae de Dn s 
are conspicuous in winter.—A. gracilior (Hack. Nash i ender form wi 
sometimes scarcely inflated upper sheaths. [A. in uu Nash] Fla. to Miss. 
17. A. campyloracheus Nash. Stem 0.4-0.8 m racemes mostly in pairs, 
sometimes in 3’s or 4’s, 5-10 cm. long, the terminal Ln nele dong. -exserted: 
rachis slender and very flexuous, the internodes mu onger than the sessile 
spikelet, this 3—4 mm. long, the awn as much as 2 c em. o S pinelands, 
Coastal Plain, Fla. to La a. 
18. A. Mohrii Hack. Stem stout, 0.8-1. : m. tall: xdi e especially at 
summit of sheath: racemes in 4's, 2—4 em. long, protruding from the side of 
inflated spathes and about as long as Hoo rachis Pi d flexuous: P 
spikelet 4—5 mm. long, longer than the internodes of the rachis, the awn 1.5—2 
em. long.—Wet pinelands and beach sands, Coastal Plain, Ga. to La. and N C. 
19. A. Cabanisii Hack. Stem stout, 0.6-1 m. tall: racemes 4—7 cm. long, 
pP a ae scattered along the upper = of the bn d dad 
let 6—7 . long, the first glume firm, broadly lanceolate, the awn abou 
long. —Dry E rM pen. Fla. 
20. A. arctatus Chapm. Stem 1-1.5 m. tall: racemes 3-5 em. long, tawny: 
sessile spikelet 4—5 mm. long, the awn 1-1.5 em. long.—Low pinelands, Fla. 
21. A. ternarius Michx. Stem 0.8-1.2 m. tall: racemes 3—5 em. long, silvery 
y. Bene: stout. [A. en Sch ult. A. mississippiensis Seribn. & Ball 
A. Scribnerianus Nash ]— andy soil, often in pinelands or open woods, 
UR Plain and i Bloc aides Fla. to E Tex., Okla., and Del. 
22. A. floridanus Seribn. Stem 1-1.5 m. tall: dens en em. long, slender, 
the cun long-exserted on capillary peduncle in a large loose 
inflorescence. |A. Bakeri Seribn. & Ball]— Mr s PN pod Fla. 
hraxon ciliaris cryptatheris Hack. A weak-stemmed, laxly branching 
annual, with ascending flowering branches, n ring thin cordate-lanceolate 
e S , occurs in ~ 
and old fields, various provinces from Fla. to Ark. and Penn. Nat. of Asi 
13. HOLCUS L. Tall or moderately tall o or dde with flat 
leaf-blades and terminal panicles. Spikelets in pairs, the pedicellate spikelet 
well-developed, usually staminate: racemes reduced » pe joints, these dis- 
articulating tardily, the racemes in a large open or contracted panicle.—About 
10 species widely distributed in tropical and warm temperate regions. 
Plants p with stout creeping rootstocks. 1. H. halepensis. 
Plants an 2. H. Sorghum. 
