329 



Neue Gräser. 



Beschrieben von E. Hackel (St. Polten). 



Panicum Subg. Digitaria, series: Ternata (v. s.). 

 Conspectus specierum: 



A. Gluma lY. (fertilis) post anthesin livide viridula v. pallide bruneo- 



viridula. 



P. serotinum Trin. Gluma II. dimidia spicula ± brevior. 



P. parvulimi Trin. Gluma II spiculam aequans; spiculae 1*6 

 — l'Smra longae, breviter laxeque pubescentes, raro gla- 

 briusculae. 



P. argyrotrichum Anderss. Gluma II spiculam aequans, spi- 

 culae 2*5 — 3 mm longae, dense niveo- v. subroseo-villo sae. 



P. xanthotrichum Hack. Gluma II spicula paullo ad ^/^ brevior, 

 spiculae 2'5 mm longae, setis flavis v. rufidulis longe ciliatae. 



B. Gluma IV". demum castanea, atrofusca v. atroviolacea. 



a) gluma II Vs spiculae v. totam aequans. 

 cc. Spiculae pubescentes, pube interdum minuta v. in 

 gluma II tantum manifesta. 



1. Rhachis spiculas latitudine aequans v. subaequans, 

 ziz plana, latiuscule viridi-raarginata. 



P. glahrum Ga.üd. Aünuum, decumbens; racemi 2— 5, demum 

 patentissimi , spiculae ternatae, 2 — 2*5 mm lg., pedicellis 

 glabris fultae, gluma 11 pube parca, pilis apice leviter 

 clavatis. 



P. ternatiimRoehst. Annuum, suberectum ; racemi 2 — 3 demum 

 erecto-patuli ; spiculae ternae, 2 — 2'öram lg., pedicellis apice 

 setoso-ciliatis fultae ; glumae II et III pube densa, pilis 

 apice subclavatis. 



P. violascens Knuth. Annuum, ascendens; racemi 3 — 5, demum 

 patentissimi, 1 — 2 infimi db distantes; spiculae ternae, 1*6 

 — l'Smm lg., pedicellis glabris scabris fultae; gluma II 

 et III pube brevi non clavata. 



P. argyrostachyum Steud. Annuum, ascendens; racemi 5 — 9, 

 patuli, spiculae quinae — senae, 1*6 mm lg., pedicellis rigidule 

 ciliatis fultae; glumae II et III pube densissima, pilis 

 clavatis. 



P. Gerdesii Hack. Annuum?, ascendens; racemi solitarii v. 

 rarissirae bini, erecti ; spiculae quateniae — quinae, 2-5 ram 

 lg., pedicellis hispidulis fultae, gluma II et III pube bre- 

 vissima densa, pilis in gluma II clavatis. 



P. Thivaitesii Hack. Perenne, erectum; racemi 3 — 4, erecto- 

 patuli; spiculae ternae (raro quaternae), 2 — 2*5 mm lg., 

 pedicellis tenuibus apice scaberulis fultae; gluma II et III 

 pube appressa densa alba, villis non clavatis. 



2. Rhachis tenui-filiformis. trigona, angustissime viridi- 

 marginata, spiculis 2 — 3-plo angustior. 



