98 MONOCOTYLEDONEZ. IMPERATA, — 
hyalina, enervis, glabra; IV* quam II“ vix ’/, brevior, integra v. 
bidentula, enervis v. 1-nervis, glabra ; palea quam gl. IV* '/, brevior, 
usque ad ter cirea ovarium voluta. Anthera 2 mm. longa, filamento 
basi dilatato. Styli liberi, stigmata brunnea 2,5 mm. longa subsupe- 
rantes. 
In Mexico pr. Guadalajara (Palmer 444 a. 1886, h. m.); New- 
Mexico (C. Wright 2001) ; Texas occident. (Havard, Drummond 283); 
- Arizona (Pringle in h. ni.) ; California austr., San Bernardino Valley 
(fratres Parish, 1031 in h. m.). 
4. I. exaltata (Brogn.! Voy. Coqu. Bot., p. 101 excel. syn.) ; 
culmo fistuloso ; panicula subthyrsoideo-caudata lineari-lanceolata, 
acutata ; spieulis villis involuerantibus triplo brevioribus; gluma I^ 
3-nervi (syn. vide sub varr.). 
Culmi 60—190 em. alti, pro altitudine graciles, 3—4-nodes, apice 
breviter vel minime nudi. Vagin® superne subearinatz, arctæ v. 
laxiuseule, nodisque glaberrim&. Ligula brevissima rarius oblonga 
(0,8—3 mm. longa) obtusa v. truncata, rufesceendo-membranacea, 
glabra. Lamin® e basi valde longeque attenuata a vagina vix distincta 
 eanalieulata lanceolato-lineares (raro lineares), tenui-acuminatae, 
30—80 em. longze, 7—20 mm. latze, superiores cito decrescentes, summa 
valde abbreviata, glabr: v. basi parce pilosule, utrinque leves, 
margine aeuleolato-scaberrim&. Panicula a basi latiore sensim atte- 
nuata, acuta, erecta v. apice subnutans, laxiuseula, rhachi gracili 
glaberrima; rami primarii solitarii per interstitia brevia spirali ordine 
enati, inferiores subareuato-patuli, superiores arreeti, tenuissimi, 
glaberrimi v. scaberuli, basi brevi spatio nudi et non ramulosi, dein 
ramulos secundarios alternos ereeto-patulos sursum decrescentes 
simpliees v. basi ramulo tertiano brevissimo auctos edentes, rarius 
jam a basi ramosi. Racemi primarii et secundarii inferiores 1,5—2 em. 
longi, rhachi capillari subflexuosa, internodiis glabris scabris ; pedicelli 
longiores 2 mm., breviores 0,5—1 mm. longi, omnes tenues v. tenuis- 
simi, apice plus minus elavati, scabri et presertim prope basin pilis 
parcis longissimis vestiti. Spiculz lineares, 2,5—3 mm. long, pallide 
spadiceze; gluma I™ membranacea, e basi lanceolata longiuseule 
acutata, fere acuminata, integra, dorso eonvexo a basi ad medium 
usque villis gluma plus 2-plo longioribus laxe conspersa, manifeste 
3-nervis, nervo medio apicem attingente, lateralibus paullo breviori- 
bus ; II“ P^ :quans, lanceolata, acuminata, carinata, carina inferne - 
parce longeque villosa, ceterum glabra, 3-nervis, nervo medio apicem - 
