384 MONOCOTYLEDONEAE. ANDROPOGON. 
herbaceo-chartacea, a medio sensim acutata, acutissima, subintegra 
v. minute bimucronulata v. biseta, carinis scaberrima, præter nervos 
carinales superne obsolete 1—5-nervis v. subenervis, dorso scabro- 
punctata, callo ipsa basi pilis callum vix æquantibus cincto ; II“ acumi- 
nata v. setigera, ciliolata ; III* primä parum brevior, lineari-lanceolata, 
acuta, marginibus implicatis retrorsum ciliatis ; IV* quam II® '/, bre- 
vior, lineari-oblonga, 1-nervis, ciliata, arista gracilis, 8—18 mm. 
longa, eolumná quam subula 2—3-plo breviore, haud v. breviter e 
glumis exsertä oligospirá. Palea O0. Antherz flave v. purpureæ 3— 
3,5 mm. longs. Pedicelli articulis paullo longiores tenuioresque, 
sepe filiformes, ceterum eodem modo eiliati, anthesi in vivo erecti, 
siecando curvato-patentissimi. Stigmata staminibus paullo przecociora 
prope spieulze medium horizontaliter exserta. 
Subspec. a. genuinus ; spiculis pedicellatis tal tibus 2—3 mm. 
longis subulatis ad glumam T^» 3-nervem sensim in setam ea paullo— 
duplo breviorem acutatam redactis v. gluma II“ parva auctis. — A. 
scoparius Michx. s. str. ; Vasey Agric. Grass. t. 25; A. purpurascens 
Muehl.' ap. Willd. Spec. 4, p. 913; A. dissitiflorus Trin.! in Mém. 
Ae. Petersb. ser. 6, vol. 2, p. 267 ex descr. et loco nat. non Miehx., 
Pollinia scoparia Spreng. Pug. 2, p. 13. — Laminz margine scaberri- 
mæ. Rami floriferi graciles, filiformes, infra nodos glabri; racemi 
graciles, articulis pedicellisque villis ipsis brevioribus ciliati. 
uam maxime variabilis! Notz a gradu ramificationis panicul®, 
racemis longius v. brevius exsertis, rhachi recta v. undata, articulis 
crassioribus v. tenuioribus, spieularum magnitudine, gluma I"* apice 
subintegra v. bimucronata, aristze longitudine, foliorum scabritie v. 
villositate desumpt® in variis formis ita intricatim combinats inve- 
niuntur, ut varietates vel paullo constantiores distinguere nequeam. 
Formæ v. subvarietates sequentes notatu digniores videntur: 1. typica, 
racemis in panieulam longam strictam, interdum valde ramulosam 
dispositis, e spatha breviter v. vix exsertis, rhachi subundulata, 
spieulis 6—7 mm. longis, foliis lzete v. pallide viridibus, vaginis sepe 
pilosis. 2. flexilis (A. flexilis Bose! in Poir. Encycl. Suppl. 1, p. 583), 
racemis e spatha longe exsertis, spiculis parvis (5,5 mm. longis), 
ceterum ut typicus. 3. cesia, vaginis spathisque pruinosis; 4. serpen- 
tina rhachi valde undato-flexuosa ; 5. simplicior; racemis ad nodos 
culmi solitariis v. raro binis iltaphetbus; spieulis 8 mm. longis. 
6. lolioides (A. lolioides Fourn.! Pl. Mex. 2, p. 62, diagnosi manea) 
spieulis 9—10 mm. longis, rhachi recta, gluma IV* ad '/, usque fissa, 
ariste 12 mm. long: columna non exserta. 
