484 MONOCOTYLEDONEE. ANDROPOGON. 
Culmi graciles, 60—80 em. alti, erecti v. basi ascendentes, superne 
longe nudi, teretes, simplices. Vagin® teretes (v. innovationum sub- 
compress&), arcte, leves, glabre v. margine ciliat®. Ligula brevis 
(1—2 mm. longa), rotundata, denticulata, intus serie pilorum stipata. 
Laminge e basi subæquilata truncato-rotundata lineares, inferiores 
acutæ, superiores acuminatz, 8—20 cm. longe, 4—7 mm. late, 
summa abbreviata v. mucroniformis, plans, virides, rigidule, modo 
utrinque tubereulis sparsis scaberulze, modo pilis tubereulatis hirtule, 
margine serrulato-scaberrim:e, costa media sat tenui supra anguste 
albolineata. Racemi flabellato-digitati, 4—6", rhachi communi 3—4- 
nodi 2——3,5 em. longi&e lævi inserti, 4—5 cm. longi, crassi, subfasti- 
giati, e pallide viridi et atro-violaceo variegati, parce pilosi: articuli 
pedicellique spieulz sessilis */, »quantes, a basi accrescendo-eiliati, 
ciliis summis articulo 3—4-plo brevioribus. Spiculz sessiles oblonga, 
6 mm. longe; gluma I"* coriacea, apice anguste truncata, carinis 
setuloso-ciliolata, dorso leviter depressa et in '/, superiore sspe 
foveola rotunda notata, tenuiter 7-nervis, callo pilis gluma 6-plo bre- 
vioribus barbulato, leviuscula v. punctato-scaberula ; II“ I^» zequans, 
chartacea, elliptica, obtusiuscula, 3-nervis, carina levis, marginibus 
implieatis ciliolata ; II '/; brevior, elliptico-oblonga, enervis, glabra ; 
IV** arista valida, 22—25 mm. longa, columna atro-purpurea scabra 
medio geniculata subulam paullo dilutius coloratam subsquante ; 
palea quam gluma HI 3-plo brevior, ovalis, enervis, longe ciliata. 
Anther& 1 mm. longe. Stigmata lineari-oblonga, stylis '/, longiora. 
Spiculz pedicellatz sessiles aquantes v. subsuperantes, lineari-oblon- 
ge, leviter contort® et extus curvatz : gluma I": obtusa, plana, cilio- 
lata, 13—17-nervis, dorso glabra; U“ paullo brevior, lanceolata, 
3—5-nervis, glabra; II II^» subzquans, lineari-lanceolata, IV* 
linearis, stamina evoluta; in aliis jam gl. II parva, IV* et sta- 
mina 0. 
Habitat in Mexico. 
Subvar. 1. genuinus; spicule sessilis gluma I™ glabra. — A. Schaft- 
neri Griseb. ap. Fourn. Pl. mex. 2, p. 57 (forma foveolata). In Mexico 
leg. Haenke; pr. St. Andres (Liebmann 20 in h. Havn. ); pr. Tutt 
baya (Schaffn. 126, 325). 
2. pubiflorus ; spiculæ sessilis gluma I™ in '/, inferiore pilis brevi- 
bus adspersa. — A. pubiflorus Fourn. l. e. — Pr. Orizaba (Schaffn. 
165). 
