Si% TRiANORiA DiGYNiA. lichcemunt. 



ed, three-sided, witli the angles veiy \vd\i-j .—Flozcers in pair«, one 

 sessile, the other pedicelled. Pedicel three-sided, and ciliate.— Cct- 

 /y.r of the sessile flowers two-valved, two-tlowered ; one floret herma- 

 phrodite, ihe other male. Exterior valve striated, with its anterior 

 margins and apex enlarged with a broad, membranaceous, bilid bor- 

 der; inner valve boat-»haj)ed, keeled, ciliate, and sub-aristate, one 

 floret Hi. lie, the other hermaphrodite. — Carol, glumes of each floret 

 two-valved ; the exterior one of the hermaphrodito floret bifld, with a 

 long- arista in the iork. — Calyx of the pedicelled flower two-valved, 

 two-flowered ; valvelets equal, boat-shaped, keeled, ciliate, and sub- 

 aristate ; one floret male, the other hermaphrodite. — Carol, as in the 

 sessile flowers, and also awned in the same manner. 



Obs. I am not certain that this is the original 1. aiiatatum of Liu- 

 neus and Rctzius. 



2. I. riigosiim. Linn. Sp. Pl.ed. JVil/d.'w. 940. 



Erect, lar.ious. Leaves lanceolate ; spikes })aircd, both-flowers 

 awned ; calyces oblique, obtuse, hard, and transversely rugose. 



is generally found growing among rice, and is so much like 

 it, the inflorescence excepted, that they are not, till in flower, 

 to be distinguished. — Leaves large, smooth ; mouths of the sheaths 

 crouned with along, two-parted ligula. — Spikes terminal, and from 

 the exterior axils paired, erect, from two to three inches long. Rachis 

 jointed. — Florceis in pairs; one sessile, the o'.her on a short, thick, 

 angular clubbed pedicel. 



J5ESS1LE FLOW Ell. Cali/x two-flowcrcd, i\\o-\-d\\tA; valvelets 

 m size nearly equal, the exterior one rugose, and very hard; one of 

 the florets hermajjlnodite, the other male, each with two membrana- 

 ceous valvtrf; the inner valve of the hermaphrodite flower has along 

 twisted awn issuing from the middle of its back. 



Pedicelled flower smaller. Calyx as in the other, but con- 

 lainmg two male flowers, one of wltich is also awned. 



3. I. sei/.isagittataiH. R. 



iiuuu-t!. Ia<i;e5 ovate-lanceolate, semisagittate. S/Vi'.Ts paired, 



