E GnawiNEAE, "lRACHYPOCON. 347 
7. TRACHYXPOGON S8CROBICULATUS. t 
Tr. culmo ramoso nodis glabris foliis glabris, vaginis 
ore barbatis, spicis fasciculato - paniculatis bracteatis, rha- 
chi spiculaque fertili sessili hirtis, glumis spiculae neutrius 
maximis dorso medio glanduloso - scrobiculatis. 
Radix repens, contorta, crassiuscula, fibris descendenti- 
bus plurimis validis fibroso-ramificatis pallidis. Culmus tri- 
sexpedalis, penna cygnea crassior, erectus, strictus, teres, 
post ramificationem altero latere explanatus vel canaliculatus, 
glaber, laevis, farctus, plurinodis nodis fuscis glabris, ra- 
mosus, ramis appressis. Vaginae, si inferiores aliquot exci- 
pis. internodiis breviores, convolutae, striatae, glabrae, 
margines versus punctis glandulosis elevatis disco excavatis 
adspersae, ad latera laminae pilis longis albis barbatae. Ter- 
minales ramorum , ubi hi fasciculatim solvuntur, approxi- 
matae, laxae, lanceolatae, subventricosae, compressiuscu- 
lae, sursum divergentes, carina et margine glandulosae. Li- 
gula exserta, membranacea, rotundata, lacera. Folia infe- 
riora pedalia et longiora, 3— 4 lineas lata, superiora ramo- 
rumque 3— 1j pollices longa, angusta, omnia patula linea- 
ria, subtilissime acuminata, plana, striata, utrinque scabra, 
margine serrulato -scabra, nervo carinali valido pallido di- 
visa, rigidula, laete viridia, basi macula fusca notata. Hami 
pedales vel semipedales, subsolitarii, semiteretes, basi nudi 
simplices vaginaque folii maximam partem tecti, apice in fas- 
ciculum proliferum ramulorum vel pedunculorum subfastigia- 
torum soluti. Pedunculi 3 — 4 pollicares, compressi, basi 
spathellis lineari -lanceolatis membranaceis fuscescentibus in- 
terstincti, apicem versus hirsuti, infra medium nodo prae- 
diti ibidemque recurvi, ex quo nodulo vagina oritur lanceo- 
lata, setaceo-acuminata, carinato - complicata, convoluta, 
spicam amplectens eaque (demtis aristis) duplo saepe longior, 
aphylla, carina glanduloso - scrobiculata, margine membra- 
nacea. Spicae solitariae, simplices. Hhachis vix pollicaris, 
compressa, articulata, ferrugineo-hirsuta.  Spiculae gemi- 
natae, imbricatae, dissimiles. Altera sessilis, hemigamo- 
hermaphrodita, bilinearis, lanceolata, compressa. Glumae 
chartaceae: inferior ovata, truncata, obsoletissime nervoso- 
striata, tota ferrugineo-hirta, amplectens alteram lanceola- 
tam truncatam margine membranaceam complicatam dorso 
ferrugineo - hirtam marginibus ciliolatam. Flosculus inferior 
neuter, univalvis, valvula hyalina lineari-lanceolata acuta 
ciliata enervi gluma inferiori tertia parte breviori; flosculus 
superior hermaphroditus , univalvis, valvula lineari - angusta 
tenui mox abeunte in aristam validam quatuor pollices lon- 
gam fuscescentem compressam, basin versus contortam al- 
