174 Dr. J. D. Hooker's Enumeration of the Plants 



medio inferne evaiiido, segmentis subulato-aristatis scabridis ; superior subaequilonga, 

 lineari- v. ovato-lanceolata, ad apicem breviter bifida, 2-carinata, carinis scabridis, mar- 

 ginibus involutis. Squamulae 2, obovato-cuneatse, oblique truncatae, emarginata;. Sta- 

 mina 3 ; antheris elongatis, stramineis. Ovarium ovatura ; stylis 2, terminalibus ; 

 stigmatibus plumosis. 



Allied to E. affinis, but more slender in all its parts and smaller, with 

 shorter racemes. 



The species of this curious genus, among which much confusion exists, are 

 almost confined to America, so far as hitherto known, two only being stated 

 as common to that continent and the Philippine Islands. In all that I have 

 examined, the flat rachis which bears the locustee is produced, beyond the 

 insertion of the latter, into a scabrid rigid lamina, often bifid at its apex and 

 forming an incomplete terminal spikelet. The number of locustae on the 

 rachis is variable, and they are generally in diffierent degrees of perfection, 

 the lower often neuter. In none of the other species have I seen traces of a 

 third floretj or of any reproductive organs in the upper one of the two*. 



46. Aristida subspicata, Rup. 8f Trin. Sp. Gram. Stip. p. 125. ex Act. Acad. 



Imp. Petrop., ser, vi. torn. v. 

 Hab. Albemarle Island, Mr. Macrae. 



* The following are a few observations on the American species allied to E.pilosa : — 



1 . E. curtipendula, Trin. Kunth, Agrost. p. 280. 



This species varies greatly in the degree of perfection of its upper floret, which is sometimes, though 

 very rarely, entirely wanting. More generally it consists of a simple subulate arista, placed at the 

 back of the upper palea of the lower floret. It is often triaristate, like that of E. aristidoides, Kunth, 

 and again in other specimens (Herb. Gouan, received from seed and cultivated from Mexico) ; the 

 upper floret is composed of a fully-developed lower palea, bifid, 2-lobed or bipartite, 3-nerved, the 

 middle nerve produced into a long arista, the lateral ones near the margins of the lateral segments and 

 produced beyond them into aristse. Other upper florets of the same specimen present only the trifid 

 arista. 



2. E. affinis, Hook. fil. ; spicis racemosis secundis reflexis, locustis 4-7 fasciculatis bifloris, glumiis 



subulato-aristatis infra apicem subtrifidis, floris inferioris palea inferiore trifida : segmentis aris- 

 tatis superiore subaequilonga bifida, floris superioris palea inferiore scariosa profundi bifida inter 

 segmenta aristata trinervi nervis lateralibus submarginalibus in aristas productis ; palea superiore 



