56 BOTANY OF THE VOYAGE OF THE SULPHUR. 
Habitu primo intuitu Panico Teneriffe accedit, panicula tamen non divaricata. Folia plana, ligula 
longiuscula acuta. Panicula 2-3-pollicaris, ramulis pollicaribus erectis, Gluma exterior minuta, glabra, 
interior undique pilis longis mollibus vestita. Palea floris neutri glumeformis, 1; lin. longa; margine pilis 
longis mollibus densissime ciliata, dorso glabra. Palezw floris hermaphroditi cartilaginess, parum inequales, 
acutiuscule, exterior apice leviter trinervis, interior binervis. 
In venturing to add this as a new species to the overgrown, difficult, and 
confused genus Panicum, it is on account of the peculiar aspect given to it by the 
long hairs of the inner glume and sterile floret, which is only noticed in P. Tene- 
riff@, and two or three South American species evidently different from this one. 
At the same time, notwithstanding all that has been written on Gramineae, the 
general works on the order hitherto published are either so incomplete, or so ill 
digested that it is a matter of the greatest difficulty to determine the species 
belonging to several of the large genera, or to ascertain whether they are new 
or not. 
196. Spartina leiantha, sp. n., foliis apice convolutis, racemis circa 8 alternis subremotis 
strictis, rhachidibus glabris, spiculis imbricatis, glumis levissimis, inferiore duplo breviore, superiore 
acuta paleas paullo superante, valvulis dorso nudis.—Bay of Magdalena. 
8. gracili (Trin. Agrostid. p. 88) similis sed glumarum palearumve carina nec pilosa nec scabra. Racemi 
1}-pollicares. Spicule 4 lin. longs, racemorum inferiorum arcte imbricate, superiorum subremote. Rhachis 
racemorum dilatata. 
The known species of Spartina have been so lately and so well described by 
the late Dr. Trinius, whose decease before having completed his dissertations on 
Graminee is so much to be regretted, that I have no hesitation in describing the 
present one as new. 
197. Vinra virginica, Pal. de Beauy.—Trin. Agrostid. Vilf. p. 48.—Bay of Magdalena. 
198. Cencurvs pauciflorus, sp. n., culmis suberectis, foliis glabris vix scabriusculis, involucris 
alternis distantibus pilosiusculis sub-10-fidis spiculas subternas superantibus.—Bay of Magdalena. 
Afhnis C. echinato. Folia plerumque angustiora. Spica 13-2-pollicaris, Spicule 8-10, quam in 
Cz echinato minores, spinis dorsalibus marginalibusque validis basi dilatatis, et spicule (an constanter’) tres 
nec quinque in quoque involucro. 
199. Cuoris alba, Pres|?—Kunth. Enum. p. 264.—Bay of Magdalena.—A taller plant than 
C. barbata, with narrower and longer leaves, and the sheaths and stems much less compressed. 
The spikelets have but one sterile and one perfect flower. The awn of the latter is not quite so 
long as described by Presl. 
whe Cuorprostum polystachium, sp. n., culmo humili glabro, foliis margine vaginisque pilis 
paucis ciliatis, spicis 3-5 racemosis secundis falcatis, glumis coloratis, 
. ee ee floris hermaphroditi . palea 
superiore breviter biaristata~—Bay of Magdalena. 
