of the Galapagos Archipelago. 177 



infimus subsessilis, caeteri pedicellati. Paleae 2, inferior glumis brevior, elliptico- 

 linearis, basi extiis 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 \ brevior, membranacea, 

 ad apicem minute lacero-fimbriata, carinis tenuiter ciliatis, marginibus argute inflexis. 

 Squamulae 2, majusculae, obovato-cuneiformes, oblique truncatae. Stamina 3. Ova- 

 rium minimum, breviter stipitatum, obovatum; stylis 2, basi discretis; stigmatibus 

 plumosis. Caryopsis glaberrima, lineari-oblonga, rufo-fulva, f longit. paleae 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. 



Hub. 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. SURINAMENSIS, Rotth. 



Hab. James Island, Charles Darwin, Esq. 



Spikelets rather more lax than when in a more luxuriant state. The speci- 

 mens are small, 1^ foot high, and identical with others from the island of 

 Trinidad. 



54. C. INFLEXUS, Muhl. 



Hab. Charles Island, Charles Darwin, Esq. 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. ^ 



