362 MONOCOTYLEDONEJE. ANDROPOGON. 
neutre, tabescentes, raro c sessilesque æquantes, cum his formå 
convenientes, mutic® v. e gluma I” aristulatz; sessiles a dorso sub- 
compresse, harum gluma I* marginibus implicata, inde bicarinata, 
II? mutica v. breviseta, IV* sepius fere ad basin usque bifida raro 
biloba v. bidentata, ex sinu aristam graeilem perfectam exserens, 
rarissime (non nisi in varietate una) mutica. Palea sæpius 0. Stigmata 
angusta, stylis sepius duplo longiora, anthesi infra mediam spiculam 
exserta. Caryopsis elongata, plerumque fusiformis v. lineari-subulata, 
teretiuseula, embryone caryopsi plerumque 3—4-plo breviore. 
Gramina s&pe humiliora, zonam tropicam temperatasque Americze, 
pauca zonam tropicam Afriez, Asiz, Australie incolentia. — Culmi 
plerumque graciles, sspissime florifero-ramosi, ramis interdum ita 
erebis ut panicula spuria (foliifera) formetur, ad racemi insertionem 
articulati, ibique scarioso-appendiculati, infra raeemum plerumque 
spatha propria (vagina folii summi sæpissime lamina destituta) race- 
mum basi vaginante v. plus minus obtegente, rarius ab illo distante 
instructi. Lamins lineares, plerumque anguste. Rhacheos articuli 
ima basi fasciculo pilorum perbrevium instructi, ceterum varie pilosi 
v. glabri. Spiculæ sessilis gluma I” callo brevi, obtuso, antice preeter 
basin plerumque glaberrimo, lateribus annulo pilorum brevium ad 
articuli pedieellique vicini basin extenso stipato; gluma II? acute 
carinata, 1-nervis v. nervulis 2 lateralibus tenuibus aucta; III* mar- 
ginibus implicata, 2-nervis v. ssepius enervis; glumæ IV’ arista 
columná plerumque rectä, glabrá, atrofuscá, subulä albidá v. flavidá, 
basi sepius laxe tortä. Lodicule glabrze (Spec. 1—25). 
A. Annui. — Culmi plerumque humilores, absque innovationibus, sed ope ramo- 
rum basilarium cæspitosi, superne florifero-ramosi v. raro simplices, plus 
minus compressi; vagin® carinato-compress&, laxiuscule v. subdilatatze, 
internodiis multo breviores, carina scabr&, ceterum glaberrimze, v. raro 
. ad nodos minute puberule, summa sæpius spathiformis. Ligula rotun- 
dato-truncata, glabra. Laminæ e basi rotundata lineares, plans, ple- 
rumque breves, imæ sæpius parvuls, sepius rigidul®, costa medi 
an 
neari-lanceolata apice ssepius dilatata ae v. acutiuscula, inter- 
dum lamin® rudimento mucroniformi terminata. Racemi recti, 5—12- 
e rhachi, sessiles e pedicelli basi sine ullo vestigio bracteolarum enasci, mar- 
gines v. appendices illos scariosos vero sero, florum staminibus jam semievo- 
lutis, emergere. 
