Roltbcellia. triandria digynia. 357 



6. R. setacea. Corom. pi. ii. N. 132. 



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

 Spikes solitary, terminal, unilateral ; rachis not joined. Caly- 

 ces one-flowered. Corols two-valved, hermaphrodite. 



Grows on old Malls. 



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

 six inches high. Leaves, inside a little hairy, in size propor- 

 tioned to the plant. Spikes terminal, solitary, awled, secund, 

 about an inch, or an inch and a half long-. Rachis excavated 

 on one side, but not joined. Flowers, they are all hermaphro- 

 dite, imbricated transversely on the excavated side of the ra- 

 chis. Calyx one-flowered, two-valved ; valvelets equal, mem- 

 branaceous margined. Corol two-valved, membranaceous, 

 hairy. Stamens three. Styles two. 



7. R. Thomcea. Linn. sp. pi. ed. Willd. i. 464. Corom. pi. ii. 

 N. 132. 



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

 terminal, two ranked. Rachis not jointed. Calyces one-flow- 

 ered. Corol two-valved. 



R. Thomasa and pilosa. Linn. sp. pi. 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, ex- 

 clusive of the spike, and two with it. Leaves bifarious, nu- 

 merous. Spikes terminal, solitary, subulate, distichous, com- 

 pressed. Rachis waved, 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. Corol two-valved, membranaceous, hairy. 

 Stamens three. Styles two. 



8. R. hifora. R. 



Setaceous. Spikes simple, subulate ; rachis not articulate, 



W 3 



