of the Galapagos Archipelago. 177 
infimus subsessilis, czeteri pedicellati. Pale 2, inferior glumis brevior, elliptico- 
linearis, basi extüs et ad margines sericeo-pilosa, ad apicem bifida, 3-nervis, nervo 
medio scabrido in aristam brevem rectam producto, nervis lateralibus submarginalibus 
infra segmentorum apices evanidis ; superior inclusa, inferior 1 brevior, membranacea, 
ad apicem minut lacero-fimbriata, carinis tenuiter ciliatis, marginibus arguté inflexis. 
Squamule 2, majuscule, obovato-cuneiformes, obliqué truncate. Stamina 3. Ova- 
rium minimum, breviter stipitatum, obovatum; stylis 2, basi discretis ; stigmatibus 
plumosis, Caryopsis glaberrima, lineari-oblonga, rufo-fulva, $ longit. paleze inferioris. 
I refer the genus of this grass with much hesitation to Calamagrostis. The 
habit is that of Arundina, Kunth, though it perfectly coincides with Bromus 
in generic character. The flowers are sometimes quite solitary, but often 
there are 3-5: the upper, where two or more exist, is generally rudimentary. 
51. Cyperus ROTUNDUS, L. 
Hab. Albemarle Island, Mr. Macrae. Common also in all warm parts of South America. 
52. C. STRIGOSUS, L. 
Hab. Charles Island, Charles Darwin, Esq. Also found in the warm parts of South America, 
and at Oahu. 
53. C. SuniNAMENSIS, Rottb. 
Hab. James Island, Charles Darwin, Esg. 
Spikelets rather more lax than when in a more luxuriant state. The speci- 
mens are small, 14 foot high, and identical with others from the island of 
Trinidad. 
54, C. inrtexus, Muhl. 
Hab. Charles Island, Charles Darwin, Esg. Albemarle Island, Mr. Macrae. James Island, 
Dr. Scouler. 
Identical with Canadian and other specimens. The species has a very wide 
range, from Canada to Texas in North America. It hardly differs from the 
C. aristatus, Rottb., found in Senegal, Senegambia and Abyssinia, and is also 
allied to a Guiana species, from which however it is quite distinct, and appa- 
rently is not a South American plant. There are two varieties in the col- 
lection. 
