jif) Mriiiniis liivxicr I'. IHsliop Miisriiin 



'I'lir I law aiian species are all ])ereiinials helmii^in^ Id the seclinns ol the 

 genus havins;- the racemes aggregate at the end nf ihe culms on rui cxserted 

 peduncle, 'i'hcy have all lieen introduced for Irial as forage grasses and have 

 escaped from the plots where they were being grown. 



Racemes muiiennis, in whorls or fascicles, scattered along an axis lO to 20 cm. Ioiil,': awn^ 



alxiiit 1 cm. long i. A. intermedius 



Racemes 2 to several, appro.xiniate at the summit of the culm : awns more than i cm. long. 



Culms pubescent below the panicle ; spikelets pubescent but not silky 2. A. nodosus. 



Culms glabrous below the panicle. 



.\wns brown; racemes moderately pilose .V A. sericeus. 



.\wns pale: racemes densely silky 4. A. saccharoides. 



1. Andropogon intermedius K. I'.r. I'mdr. IH. Nov, Ikdl. 1:202. 1810. 



Culms erect, i to 1.5 meters tall, glabrous, pilose at the nodes: sheaths smooth: blades flat 

 nr folded, elongate, about 5 mm. wide, glabrous, ])ilose around the base; panicle oblong, 10 to 

 20 cm, long, the axis smooth, the branches slender, in whorls, naked below, branching alxjve, 

 llie branchlets ajijiressed, pilo>e at base, bearing short racemes; joints of rachis pilose above, 

 enlarged and cup-shaped at the upper end, about 2.5 mm. long and as long as the pedicel of the 

 sterile floret, the latter ])iloi-e on the margins ; sessile spikelet short-pilose at base, narrowly elli]> 

 tic, al)out 4 mm, long, appressed-pilose, especially below; glumes about equal; sterile lemma 

 narrow, two-thirds as long ;s the glumes: fertile lemma consisting of a slender awn alxjut i cm. 

 long, twisted below, obscur-ly geniculate above; sterile or pediceled spikelet consisting of a 

 single elliptic glume 3 to 4 nini. long. 



Cultivated grouni ; itilroduced. Originally described from .\ustralia. 

 Molokai: l{astern end. along edge of taro field, llilchcock 15079. 



2. Andropogon nodosus (Willeni.) Nash, N. Amer. Kl. 17:122. 1912, 



Diclianthiinn nodosun W'illem. .\nn. Bot. U.steri 18:11. 1796. 



Audro{>ogon caricosns moJUcoinus Hack, in DC. Monogr. I'han. 6:569. 1889. 



Culms erect from a more or less geniculate base, glabrous, 1 to 1.5 meters tall, pubescent 

 at the nodes: sheaths glabrous: blades flat, 10 to 20 cm. long, 2 to 6 mm. wide, pilose around the 

 base, scabrous on the upper surface ; panicle of 2 to 5 pedunclcd racemes approximate at the 

 suiumit of the culm, this and the peduncles densely and softly inibescent ; racemes flexuous, 

 3 to 8 cm. long, the spikelets crowded, the broad outer glumes of the sessile and ])ediceled 

 sjiikelets imbricate, concealing the rachis and the remainder of the .spikelet. the rachis pilose; 

 sessile spikelet 4 mm. long, short-pilose at base ; outer glume broad, oblong, rounded at the 

 apex, several-nerved, ai^pressed-pubescent on the lower half, hispidulous on the margin ; second 

 glume narrower than the first, about as long, keeled, glabrous on the back. ])ubescent along the 

 margin; sterile lemma very thin, nearly as long as the glumes; fertile lemma very narrow, con- 

 tinued into a bronze-brown awn 1.5 cm. l<ing. tightly twisted to the first bend, loosely twisted 

 to the second bend, straight beyond. 



introduced for trial by G. 1'. Wilder and called Wilder grass. Troi^ics of 

 .\sia. (Jriginally described from Mauritius. 



Escaped from grounds of the United States Experiment Station. 

 Oahu: llonohiu, llitchoick 14071: W'estgate in \^)\^. 



3. Andropogon striceus K. I'.r. i'rodr, I-'i, Nov, ll(;li, 201, 1810. 



Culms erect, or decumbent at base, glabrous, pilo.se at the nodes. 30 to 100 cm, tall; 

 ,sheaths glabrous: blades flat or more or less involute, often glaucous, .scabrous, attenuate- 

 pointed. 10 to 20 cm. long. I to 5 mm. wide, the uppermost very short; inflorescence of 2 to 



[118] 



