4S TRIANDRIA. DIGYNIA. 



than the calix, surrounded with a pubescence 

 or long wool at the base, the dorsal valve with 

 or without awn. 



Flowers paniculate, panicles often contracted, some- 

 times conglomerately lobed. Callx mostly acuminated, 

 and exceeding- the corolla. Glumes of the corolla of- 

 ten lacerate, generally surrounded at the base with a 

 woolly involucellum, sometimes merely pubescent near 

 the base; the dorsal valve usually embracing the inner 

 cne, and awned very often below the summit. 



S PEC I Es. 1. JMexicana. Panicle erect, capillary branch- 

 ed, branclies approximating, leaves glabrous, with a sca- 

 brous margin; calix acuminate, nearly equal, much lon- 

 ger than the corolla; valves of the corolla unequal, the 

 inner valve embraced by the outer, very small, and lace- 

 rate, the dorsal valve producing a straight awn from about 

 the middle; woolly involucellum longer than the corolla. 



Obs a grass abom 2 or 3 feet high, points of the calix 

 bluish purple. This plant is described as destitute of an 

 awn; tlie awn is indeed short and very slender, and rea- 

 dily confounded with ilie long wool arising from tlie base 

 of the corolla. Agrostis JMexicana? Persoon. Arundo 

 »grostoides. Pursh. 



2. Colorata, Sibthokp. Phalaris atvindifiacea, Lin. 

 Annido cohrata, Smith. Flor. Brit. Phalans Amenncana? 

 of Mr. Elliott, wlio considering the 2 feathered ap- 

 pendages at tlie base of the corolla (" basi penicillis duo- 

 bus lanae flosculo longe brevioribus." Smith.) as auxil- 

 liary glumes of the corolla, which probably tliey may be, 

 conceived it to be distinct from the European plant. — 

 This species is indeed very nearly allied to Phalaris. — 

 3. canade7isis, ( Arundo canadensis. MicH.J As this is 

 justly considered a dubious plant, I hope the reader will 

 excuse any additional ren^arks. 



Panicle oblong, appressed, branched near the base; 

 flowers conglomerate, partly inclined to one side; calix 

 glumes lanceolate, somewhat carinate, nearly equal, 

 ;/<\arply acuminate, and a little longer than the corolla; 

 outer glume 3-nerved, inner^glume with only a single 

 nerve, the carina of both scabrous; valves of the corolla 

 nearly equal in length, acute, entire at the points, and 

 scariose on the margin, the dorsal valve obscurely 5-nerv- 

 ed, awned a little below the summit; awn straight, scarce- 

 ly half the length of the valve; inner corolla glume nar- 

 row, with a deep dorsal channel, near the base of which 

 arises a neutral stipitate tuft of pappus, similar to that 



