174 Dr. J. D. Hooxer’s Enumeration of the Plants 
medio inferné evanido, segmentis subulato-aristatis scabridis; superior subzequilonga, 
lineari- v. ovato-lanceolata, ad apicem breviter bifida, 2-carinata, carinis scabridis, mar- 
ginibus involutis, Squamule 2, obovato-cuneatze, obliqué truncate, emarginate. Sta- 
mina 3; antheris elongatis, stramineis. Ovarium ovatum; 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 locuste 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 locustz on the 
rachis is variable, and they are generally in different degrees of perfection, 
the lower often neuter. In none of the other species have I seen traces of a 
third floret, or of any reproductive organs in the upper one of the two *. 
46. ARISTIDA sUBsSPICATA, Rup. & Trin. Sp. Gram. Stip. p. 125. ex Act. Acad. 
Imp. Petrop., ser. vi. tom. 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 ariste. 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, glumis 
subulato-aristatis infra apicem subtrifidis, floris inferioris palea inferiore trifida : segmentis aris- 
tatis superiore subzequilongá bifida, floris superioris paleà inferiore scariosá profundé bifida inter 
segmenta aristata trinervi nervis lateralibus submarginalibus in aristas productis ; paleá superiore 
