itottbcetlia. »riiwbria biitwiA. 157 



6. R. sefacea. Corom, PL ii. N. 152. 



Erect, setaceous, smooth, from two to six inches high. Spikes 

 solitary, terminal, miilateral j rachis not joined. Calj/ces one-flow- 

 ered. Carols two-valved, hermaphrodite. 



Grows on old walls. 



Culms many, erect, ramous, filiform, smooth, from two to six 

 inches high. — Leaves, inside a little hairy, in size proportioned to 

 the plant. — Sjrikes terminal, solitary, awled, secund, about an inch, 

 or an inch and a half long. Rachis excavated on one side, but not 

 joined. — Flozcers, they are all hermaphrodite, imbricated transvers- 

 ly on the excavated side of the rachis. — Calyx one-flowered, two- 

 valved ; vahelets equal, membranaceous margined. — Coro/ two-valv- 

 ed, membranaceous, hairy. — Stamens three. — Styles two. 



7. R. Tliomaa. Linn. Sp. PL ed. Willd. i. 464. Corom. TL ii. N. 132. 



Erect, compressed, about two inches high. Spikes solitary, ter- 

 minal, two ranked. EacA/s not jointed. CaTyces one-flowered. Carol 

 two-valved. 



R. Thomaa and pilosa. Linn- Sp. PL ed. Willd. i. 464. 5. are, I 

 suspect this very species. 



Grows, with the last species, on old walls. 



Culms minute, erect, compressed, about an inch high, exclusive 

 of the spike, and two with it. — Leaves bifarious, numerous. — Spikes 

 terniinal, solitary, subulate, distichous, compressed. Rachis wav- 

 ed, excavated on the opposite side, not articulated. — Flowers all 

 hermaphrodite, disposed alternately in the excavations of the rachis. 

 —Calyx one-flowered, two-valved ; exterior valvelet rigid, linear ; 

 interior boat-shaped, and less rigid.— Coro/ two-valved, membrana- 

 ceous, hai\ry.— Stamens three.— Styles two. 



8. R. bifora. R. 



Setaceous. Spikes simple, subulate; rachis not articulate, butbi- 



fariously excavated for the reception of the two-flowered spikeleti. 



A native of the peninsula of India i aod in size and appearance ve- 



