592 ADDITIONS AND CORRECTIONS 



the Second Volume of the Companion to the Botanical Magazine, 

 page 23. The description is, moreover, accompanied by a beautiful, 

 accurate, and partially colored engraving of the plant. 

 Page 14. Lines 7 and 30 from the top, for " Pontederi « " read 



PoNTEPEREiK. 



Page 15. Fifth line from the bottom, for " cylindric," read terete. 



Page 15, Next after Ctperus strigosus, insert 



2.» C. repens, Ell. Root creeping, tuberiferous at the extremities ; 



umbel' simple, or compound, 4 to 6-rayed ; spikes distichous ; spikelets 



linear, obtuse, compressed, approximated and somewhat spreading ; in- 



volucre about 3-lcaved, longer than the umbel. Torr. JV. Am. Cyp. in 



Ann. Lye. M Y. 3. p. 264. 



C. phymatodes. Muhl. Catal. p. 6. Ejusd. Gram. p. 23. Bait. Phil. 



1. p. 27, Torr. Fl. 1. p. 62. Ejusd. Comp. p. 44. Beck, Bot.p. 422. 



Eat. Man. p. 118. Gray, Gram. 1. Specim. no. 73. 



C. tuberosum Pursh, Jm. \.p. 52. Also, Jsutt. Gen. 1. p. 35. Not 



of Willd. Pers. &c. 



Creeping Ctperus. 



Root (or rhizoma) perennial, of numerous coarse fibres, creeping extensively, 

 and often terminating in tubers about the size of a pea. Culm 1 to 2 feet high, 

 triquetrous, striate, very smooth. Leave* 9 to 18 inches or 2 feet long, ami 2 to 4 

 lines wide, keeled, striate, smooth, or slightly scabrous on the margin. Umbel 

 rather erect, the rays 1 to 2 or 3 inches long. Involucre usually 3 or 4-leaved, the 

 leaves scabrous on the margin, 2 or 3 of them longer than the umbel. Spikelets 

 half an inch to 3 quarters in length, a little compressed, linear, obtuse when ma- 

 ture, somewhat distichously arranged on the common rachis,-the lowest ones 

 often In pairs, or fasciculate. Glumes oblong, rather acute, nerved, smooth, pale 

 tawny, the margin scarlous. Seed oblong, triquetrous, minutely punctate under a 

 lens. 

 Hub. Cultivated lots ; West town School : rare. Fl. Aug. Fr. Sept. Octo. 



Obs. This was collected by Mr. Joshua Hoopks, in 183o, at the above locality, 

 where it appears to have been introduced ; and, if not kept in subjection, may 

 prove to be a troublesome plant. 



Page 16. Before Mariscus ovularis, insert 



1.* M. retrofr actus, Vahl. Umbel simple ; rays elongated ; heads 



obovoid, or oblong, retrorsely imbricated ; spikelets subulate, finally 



reflexed. Beck, Bot. p. 429. 



Scirpus retrofractus. Willd. Sp. 1. p. 304. Pers. Syn. 1. p. 68. 



Muhl. Catal. p. 7. Ejusd. Gram. p. 40. 



Backward-bent Mariscus. 



Root perennial, fibrous. Culm 1 to 2 feet high, rather slender, tumid at base, 

 obtusely triquetrous, striate, nearly leafless, minutely roughish-pubescent-the 

 angles scabrous near the summit. Leaves sub-radical, usually more than half the 

 length of the culm, 1 to 2 or 3 lines wide, striate, smoothish, or slightly pubescent^ 

 and somewhat glaucous. Rays 6 to 8or 10, unequal, 1 to 3 or 4 inches long, slender, 

 sub-terete, striate, smooth, sheathed at base,-the sheaths or ochrea 1 third to 2 

 thirds of an inch long, bicuspidale at summit. Involucre of several unequal leaves, 

 striate, aculeately scabrous on the margin, 2 or 3 of them often longer than the 

 umbel (all generally shorter, Torr.). //*ufrhalf an inch to near an inch long, 



