312 Ex herbario Hassleriano: Novitates paraguarienses. III. 
Affinis S. glaucae Beauv. praesertim inflorescentia spiculisque, sed 
valde diversa culmo foliisque. Nam culmus in S. glauca 2—4-nodis, 
vaginae internodiis breviores, laminae angustius lineares sensim tenuiter 
acuminatae, flaccidulae, utrinque virides; in nostra culmus 7—8-nodus,. 
vaginae internodiis longiores, laminae lanceolato-lineares breviter acutatae 
rigidae, discolores, crassinerves. 
50: Setaria gracilis H. B. K., Nov. Gen., I, 109. 
forma pilosissima Hack. form. nov. 
Foliis undique patenti pilosis. 
Paraguay: Sierra de Amambay, in arenosis Punta Porá. April 1908, 
Hassler no. 10353, leg. Rojas. 
51. Setaria scandens Schrad, ex Schult. Mantiss, Il, 279. 
var. sphacelata Hack. nov. var. 
Differt a typo gluma IV infra apicem macula fusca notata, setis ipso 
apice et parum inferius retrorsum aculeolatis, ceterum antrorsum aculeo- 
latis, foliis subsericeo pilosis. 
Paraguay: Sierra de Amambay, ad ripas rivulorum Estrella, Jan. 1908, 
Hassler no, 10141, leg. Rojas. 
52. Aristida macrantha Hack. nov. spec. 
Perennis, caespitosa innovationibus et intravaginalibus et extravagina- 
libus. Culmi erecti, ad 80 em alti, teretes, glaberrimi, plurinodes, simplices, 
superne longe nudi. Vaginae teretes, arctae, internodiis longiores, gla- 
berrimae ore obtuso haud auriculatae. Ligula margo membranaceus an- 
gustissimus, glaber. Laminae e basi aequilata lineares, sensim tenuiter 
acutatae, planae v. siceitate convolutae, innovationum ad 70 cm lg., summa 
culmi cc. 20 em lg., expansae 3—4 mm latae, erectae, rigidae, pallide 
virides, glaberrimae, crassinerves. Panicula cuneata v. scopiformis, densa, 
contracta circ. 30 cm lg., basi angustissima, apice circ. 10 cm lt., rhachi 
ramisque laevibus, ramis crebris brevibus (sine spiculis cc. 2 cm lg.) ` 
plerumque binis rhachi admotis crassiusculis fere a basi ramulosis, 
‘ramulis 1—2-spiculatis ramo appressis, spiculis dense fasciculatis breviter 
v. brevissime pedicellatis. Spiculae e maximis in genere, sine aristis 
circ. 4,5 em, aristis computatis 18—20 em longae, lanceolato-lineares, 
pallide viridulae v. leviter violascentes. Glumae steriles inaequales, I. circ. 
35 mm, IL 45 mm lg., subulato-lineares, sensim in setam circ. 10—15 mm 
longam scabram attenuatae, 1-nerves, carina in I. serrulato-scaberrima, 
in IL. laevis. Gluma fertilis linearis, filiformis, cum callo pungente 3:mm 
longo breviter sericeo-barbato 15 mm lg., scaberula v. laeviuscula, pallide 
viridula, demum cum arista articulata; aristae stipes 5—6 cm longus 
gyris 12—15 arctissime tortus scaber, rami patuli subaequales 10—12 cm 
longi subcapillares scabrae. Palea gluma cire. no brevior oblonga 
obtusa denticulata obsolete binervis. 
Paraguay: Sierra de Amambay: in campis siccis Punta Porä, 
Dec. 1907, Hassler no. 9795, leg. Rojas. 
Species in sectione Schoenatheron (Doell in Mart. Fl. Bras.) valde 
distincta, jam magnitudine spieularum a reliquis diversa, ab A, riparia 
