ADDITIONS AND CORRECTIONS 593 



rand 1 third to half an inch in diameter, obovoid or turbinate, sometimes oblong- 

 Spikclcts numerous, slender, subulate, l-flowered, the upper ones mostly spread- 

 ing, the others more or less reflexed. Glumes striate, the 2 lowest ones short, 

 iance-ovate, empty, the middle one lance-oblong, fertile, the terminal one very 

 narrow and involute. Seed linear, triquetrous. 



Hub' Chesnut hill, near Pugh-town: rare. FL August. Fr. Sept. 



Obs. Collected in the above locality, August, 1836, by Mr. Joseph Ri.vehart 



Page 18. Line 13 from the top (and wherever the words occur), fox 

 "Torr. Scirp." read Torr. M Am. Ci/p.— also after «;>."add tht 

 figures 344. 



Page 18. Line 25 from the top, for "JFV. July. Fr. August." read 

 FL Aug. Fr. Sept. 



-Page 18. Line 13 from the bottom, for "Trichelostylis capillaris" 

 read Isolepis capillaris— and after "/>." add 350. 



Page 19. Line 7 from the top, for "Trichelostylis autumnalis" i 

 Trichelostylis mucronulata— and after "/>." add 355. 



Page 19. Line 27 from the top, after "/>." add 299. 



" Line 5 from the bottom, after "p." add 302. 



Page 20. Line 18 from the top, after "/>." add 309. 



" " Line 17 from the bottom, after «p? add 308, 



Page 21. Before Scmrus debilis, insert 



9/ S. TiuauETER, L. Culm nearly naked, triquetrous ; spikeFets ] 



to 5, lateral, aggregated, sessile, oblong-ovoid ; glume* orbicular-ovate, 



mucronate ; seed unequally and doubly convex, acuminate. Torr. „V. 



Am. Cyp. in Ann. Lye. JST. Y. 3. p. 322. 



S. americanus. Pursh, Am. 1. p. 56. Nuti. Gen. 1. p. 32. Bart. 



Phil. \.p. 33. Ell. Sk. 1. p. 80. Bigel. Boat. p. 21. Torr. Fl. 1. p. 



47. Ejusd. Comp. p. 38. Beck, Bot. p. 425. Eat. Man. p. 329. 



Gray, Gram. 2. Specim. no. 134. Also, Pers. Syn. I. p. 68. 



Also, 8, mucronatus. Pursh, Am. I. p. 55. Ell. I. c. Eat. Man. p 



330. 



TiuatTETiiors Scmrus. Vulgo — Chair-maker's Rush. 



R )ot perennial. Culm 2 to 4 or 3 feet high, cuspidate at summit, acutely trique- 

 trous (2 of the sides concave the other flat), naked and smooth, sheathed at base, 

 the sheaths often bearing a few short leaves. Spikeltts in a dense lateral cluster 

 often near the summit, ovoid, or ovoid-oblong. Glumes orbicular-ovate, often 

 emarginate, and mucronate with the projecting midrib, ferruginous on the sides, 

 the margin scarious and somewhat pubescent. Seed somewh.it triquetrous, with 

 convex sides, abruptly acuminate, dark brown, smooth. Bristles 3 to 5 or 6, slen- 

 der, retrorscly scabrous, brittle, 



Hab. Margin of the Schuylkill, above Pughtown : rare. /?. July. Fr. Sept. 



Obe. Collected by Mr. Joseph Rinehart, Aug. 1836. This is the plant genex 

 ally used in making the seats of rush-bottomed Chairs, in the U. States. It does 

 not attain to so large a growth in this County as it does along tide water. 



.Page 25. Line 9 from the bottom, for " Sclebe^," read Sclebie* 7 



50* 



