RM is | PLANTAE TRAME 257 
k pt habitis et paleam floris foemineam uninervem Cinnam cum 
 Agrostide connectens. 
. 786. C. polygama Gr. (Tab. 2. f. 7.) — Rhizoma repens; culmus 
4 — 6pedalis, laevis, ad summam fere partem vaginis foliorum elongatis apice 
laxis inclusus; folia pedalia, lineari-acuminata, glabra, scabriuscula, 
4—6” lata; panicula erecta, pedalis, pedicellis longioribus spiculae sub- 
 aequilongis leviter scabriusculis; spieulae 11l/5'^ longae, arista breviter 
exserta; glumae. lanceolato-acutae, steriles uninerves, fertiles apice den- 
ticulatae, rudimentum stipitiforme (pilis erectis inclusis) paullo superantes; 
flos d ovario rudimentario staminibus cincto, 9 staminibus destitutus. 
— Tucuman, in pratis m. Cuesta de Anfama, in regionem superiorem 
adscendens. 
Diachyrium nov. gen. 
Spiculae in panicula contracta uniflorae, callo minuto glabro, flore 
incluso. Glumae chartaceo-membranaceae, uninerves, acuminatae, muticae, 
steriles paullo inaequales, fertilis conformis. Paleae 2 distinctae, latera- 
les (i. e. respectu glumarum transversae), nervo utriusque solitario margini 
a gluma remoto approximato. Lodiculae 2 majusculae, paleis oppositae. 
Stamina 3. Stigmata divergentia, supra basin plumosa. Utriculus liber, 
compresso-ovoideus, Embryo parvus. — Gramen perenne, strictum, habitu 
Psammae, foliis rigidis erectis convoluto-filiformibus, ligula i icem. 
panicula elongata lineari, spiculis pallidis. 
Genus Agrostidearum pericarpio solubili Sporobolo comperalilia, pa- 
leae quam dicunt superioris loco squamis 2 ad basin plane distinctis et 
rosenthesi 14 versus glumas sitis valde memorabile. 
787. (118) D. arundinaceum Gr. (Tab. 2. f. 8.) — Culmus « erectas, 
2— 3pedalis, validus, laevis, compresso-cylindraceus, basi vaginis planis 
4— 6'^ latis dense involutus, cum iis pallide stramineus, superne aphyl- 
lus; folia culmum subaequantia v. longiora, cylindrica, !/j^' diam., apice 
pungentia, glabra, laevia, vaginis elongatis, inferioribus aphyllis, suprema 
culmum inferne involvente, lana - ligulari 2^" longa secus marginem va- 
ginae aliquid decurrente ; — 6—12 longa, 3—4"" lata, utrinque 
Phys. Classe. XIX. Kk 
