of the Galapagos Archipelago. 179 
13 lin. diam., sulcati, simplices. Folia bipedalia, 3 lin. lata, numerosa, pleraque radicalia 
basi vaginantia; vaginis pallidé rufis, membranaceis, ad basin fissis, lineari-oblongis, 
truncatis, 1 unc. longis, compressis, } unc. latis; lamina longissime linearis, flexuosa, 
plana, nervosa, dorso acuté carinata, striata, flexuosa, marginibus minuté et remoté 
denticulatis: folia caulina vaginis integris, 2-3-uncialibus, antice membranaceis, ore 
integerrimo truncato; lamina longissima, ut in foliis radicalibus. Involucri foliola 
4-5, basi imbricata, evaginata, foliis caulinis equilonga et iis subsimilia. Umbella 
longiradiata, radiis 8-10, quorum 1-2 sessiles, cæteri longepedunculati, solitarii, v. 
2-5, pedunculis basi vaginis cylindricis 3 unc. longis inclusis. Spica terminales, elon- 
. gato-oblongz, cylindraceze, ad apices rotundatz, 3 unc. longe, } late laterales. Spicule 
80-100, erecto-patentes, 1 lin. longe, pallidé fuscescentes ; squamá inferiore basi ple- 
rumque involucellis zequilongis subulatis ciliatis suffulta, enervi, latè ovatá, secunda 
subsimili breviore, tertia hermaphroditá, sub 7-9 nervi; infimá ter longiore convolutá, 
ad apicem obtusum obliqué truncata, dorso scaberulá; rachis ultra squamam fertilem 
dilatata, marginibus membranaceis hyalinis; squamá quartá parva, exsertá, laté ovata, 
obtusá, naviculari, sub 5-nervi, squamulá auctá. Stamina 3; filamentis planis, line- 
aribus ; antheris inclusis, subulatis, stramineis. Ovarium elongato-obovatum, trialatum ; 
stylo basi incrassato, trifido, ramis flexuosis exsertis. Achenium trigonum. 
In this and the following species the 4th scale is much reduced, forming an 
appendage at the summit of the dilated rachis, and having a small membra- 
nous lanceolate scale at its base, between which is an abortive flower. The 
leaves are longer than in the specimen figured by Kunth. 
57. Mariscus sracuystacuys, Hook. fil.; culmo erecto basi repente, foliis 
elongatis suberectis rigidis carinatis marginibus denticulatis, involucri 
foliolis 3-5 striatis, spicis cylindraceis umbellatis, radiis brevissimis, 
squamá hermaphroditáà infimá bis longiore latè ovata basi convoluta, 
lamellà squamae superioris elongata. 
Hab. James Island, Dr. Scouler. Charles Island, Charles Darwin, Esq. 
Very distinct from the last in the smaller size, the very rigid and more 
strict leaves, the almost sessile spikes, and especially in the very abbreviated 
spikelets of red-brown scales, with the scale of the hermaphrodite flower 
much shorter, broader, and more open. 
CoMMELINE. 
58. COMMELINA AGRARIA, Kunth. 
Hab. James and Charles Islands, Charles Darwin, Esq. 
vOL. XX. 2B 
