TRIANDRIA D1GYNIA 89 



:). A. tibsinicus, L ? Culm somewhat compressed ; sheaths smooth; 

 spikes 2 to 3, in slender, distant, appressed fascicles, lateral and ternii- 

 nal ; abortive spikelct incomplete ; perfect floret monandrous ; awn 

 straight Beck, Bot. p. 418. Specim. Gray, Gram. 1. no. 65. 

 A. dissitiflorum. Mx+ Am. I. p. 57. Ell. Sk. 1. p. 149. Bart. Phil. 1. 

 p. 56. Also, Pers. Syn. 1. p. 104. H'ilUL Sp. 4. p. 914. Pitrsh. Am, 

 I. p. 75. J\*utt. Gen. I. p. 61. 



VlKGIXIAX AXDROPOGOX 



Boot perennial. Culm about 3 feet high, smooth, compressed below, silicate on 

 #ne side, semi-terete above, with remote short branches partly concealed by the 

 sheaths : nodes smooth. Leaves linear, scabrous on the margin ; lower ones lonsr, 

 pilose on the margin and upper surface : sheuths smooth, pilose on the margin; fa- 

 gule short, ciliatc. Spikes in pairs, or 3's, about an inch long, in scattered lateral 

 fascicles of 2 or 3 short slender branches, panly concealed in the compressed, 

 acuminate sheaths. Common peduncle sometimes, but not generally, pilose at 

 the base of the compressed, bract-like sheaths: rathis filiform, pilose with long 

 white silky hairs. Abortive spikclet an awn-like plumose pedicel, longer than the 

 perfect one. Perfect spikelet small, linear-lanceolate , triquetrous, acuminate, sca- 

 brous on the angles: Glumes (mju.i1 ; t!ur l-.wer or miter one with twi. ereen keels. 

 the upper with me. Pulca, thin and delicate ; upper? one shorter, bifid at ape.\ ., 

 with a slender straight awn between the minute segments. Stamen 1. 

 Bab. Sterile hills, and exsiccated swamps; frequent. /Y. Sept. Fr. Octo. 



Obs. This differs, in habit, fr m the preceding,— but is wry nearly allied, in 

 its botanical characters. It was first collected here in 182$, by I). Townsend, Esq. 



4. A. scoparius, Mr. Culm paniculatcly branched above ; branches 

 somewhat fasciculate, erect, slender; spikes simple, terminal and lat- 

 eral, on long peduncles, ; abortive spikelct mostly complete, neuter 

 awned. Beck, Bot. p. 417. Spbcim. Gray, Gram. 1. no. 64. 

 A. purpurascens. MuhL Catal. p. 94. Mjfued. Gram. p. 282. Willd. 

 Sp. 4.p. 913. Bart. Phil. 1. p. 55. Bigel. Boat. p. 43. 

 Bhoom Axdiiopogox. Vvlgo— Pbrple Wood grass. 



Root perennial Culm 3 to 4 feet high, rather slender, branched, smooth, some- 

 what compressed, sulcata on one side, tumid or gibbous at the nodes- nodes 

 smooth; branches long, slender, in lateral fascicles, or sometimes in pair's, often 

 subdivided. Leaves lance-linear, acute, scabrous, a little hairv, and somewhat 

 glaucous: shca'h* striate, roughish, lower ones hairy; ligule truncal,. Skdkes 

 an Inch and half to 2 inches in length, simple, on long peduacles. or at the ends of 

 the slender branches, generally purple: tachis compressed, or plano-convex, ot- 

 iose at the edges. Spikelet* distant, aUarftate, dlstichously arranged. ibortL 

 spikelet minute, subulate, on a linear, compressed, plumose pedicel which is near- 

 \y as long as the perfect spikelet ; 1 met glume scabrous, terminaiing in a distinct 

 awn ; palca : inconspicuous ; floret neuter. Perfect spikelet sessile ; glumes lance, 

 inear, much acuminated, lower one bifid at apex. Palca nearly equal, ciKate on 

 the margins ; upper? one deeply bind, with a twisted awn between the segments. 

 Hob. Sterile banks: old fields; roadsides .-common. Fl. August. /V.Sept. 



VmtS^^ M ^ S P ike8di ^^,or fasciculate, generally by 



418. Ppbcxh. Gray, Oram, 1. no. G3. 



I-obkcd ArfnBdFOGox. H/^-FingeMpikd Wood ffrass. 



