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medium sensiin attenuata acutiuscula, Integra, carinis valde 

 elevatis aculeolato-scabris, ceterum enervis, dorso leviter im- 

 pressa, glabra, laevis, callo pilis spicula 2 — 3-plo brevioribus 

 vestito; UA^ acutiuscula, mucronulata. uninervis, carina aculeo- 

 lato-scabra, margine ciiiolata ; IVa parum brevior, oblouga, 

 brevissirae acuteque bidentata, glabra; arista gracilis 15 — 16 

 mm. Ig. prope gluinarum apicem leviter geniculata spiris 1—2 

 inferne torta superne sea bra. Anthera unica ovali-oblonga 

 1 mm. Ig. Pedicelii steriles spiculam 5 subsuperantes, ceterum 

 articulo simillimi, glumam unicam 1 — 1*5 mm. longam saepius 

 mucronatam v. setigeram ferentes. 



Mexico: prope Chinantla in campis Ig. Liebmann nr. 

 590, prope Orizaba 1. Bourgeau n. 2376. 



Inter species monandras insignia ramis floriferis spatha 

 propria expertis. CL Fournier specimina Bourgeana ad A. ma- 

 croihricem Trium ducit, qui vero staminibus 3 etc. valde difFert. 



18) A. Cahanisii. Perennis. Culmi 60 — 100 cm. alti, gra- 

 ciles, a medio v. inferius ramosi; rami inferiores 1 — 2ni, pri- 

 marii elongati, graciles, arcuato-patentes 1— 2-nodes, ad nodos 

 glabri, secundarii solitarii breves vel 0. Vaginae glabrae, lae- 

 ves v. scaberulae. Laminae 10 — 20 cm. Ig,, 2—3 mm. It., linea- 

 res, breviter acuminatae, planae vel plus minusve complicatae, 

 glaucescentes, subtus breves, supra hispidulae, margine scabe- 

 rulae, basi interdum fimbriatae. ceterum glabrae, Spathae spi- 

 caruni propriae 6—8 cm. Ig.^ interdum lamina brevissima se- 

 tacea munitae, glabrae, virides, a spicis plerumque remotae. 

 Peduuculus communis apice dense barbatus. 

 4— 4*5 cm. Ig., crassiusculae; 



Spicae binae, 

 rhacheos articuli crassiu- 



scule lineares, subclavatae, spicula Y^ breviores, villis laxiu- 

 sculis, summis articulo sub brevioribus vestiti. 

 Spiculae J lanceolatae 5 — 6 mm. Ig., pallide virides, per lanam 

 parciorem manifestae; glum a I^a a medio attenuata, apice 

 subintegro acutiuscula, praeter carinas nervis 2 — 3 teuui- 

 bus percurrentibus notata, inter carinas aculeolato-sca- 

 bras parum depressa, dorso scabro-punctata v. hispidula; 

 gluma IVa ciliata, aristam tenerrimam 14 — 20 mm. longam ex- 

 serens, cujus columna 1— 3-spira pauUo glumas superat; gl. 

 Va obsoleta v. 0. Stamina 3, antheris 3 mm. longis. Pedicelii 

 spicularum tabescentium 3 mm. longarum uniglumium subula- 

 tarum spiculam ? aequantes, ceterum articulis simillirai. 



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