TETRADYNAMIA— SILIQUOSA. Arabis. 209 



It is said that H. matronaUs, originally brought by Europaean set- 

 tlers to the United States of America, loses its scent the second 

 season, and is obliged to be renewed by fresh seeds from Eu- 

 rope. See the remark under ^thusa, v. 2. 65. 



340. ARABIS. Wall-cress, or Rock-cress. 



Linn.Gen.34\. Juss. 238. H.Br.7\l. Comp. ed. 4. \08. Br. 

 in Ait. H. Keiv.v.4. 104. DeCand. Sijst. v. 2. 213. Lam.t.b63. 

 f. 1-3. 



Ca/. erect; leaves ovate-oblono-, converging, deciduous; 

 2 opposite ones rather the largest, somewhat protuberant 

 at the base. Pet. obovate-oblong, undivided, a little 

 spreading, tapering at the base into broadish claws, hardly 

 so long as the calyx. Filam. thread-shaped, erect, sim- 

 ple, unconnected, usually with 4 glands at their base ex- 

 ternally. Anth. roundish-heart-shaped, incumbent. Germ. 

 linear, about the length of the stamens. Style very short, 

 or none. Stigma obtuse, simple. Pod linear, compress- 

 ed, crowned with the permanent stigma; valves almost 

 flat, ribbed, or veiny, slightly undulated from the protu- 

 berance of the seeds, quite as long as the linear mem- 

 branous partition. Seeds in a single row, pendulous, oval 

 or orbicular, compressed, with or without a border ; co- 

 tyledons flat, accumbent. 



Annual or perennial, leafy, upright herbs. Leaves simple ; 

 entire or toothed ; the radical ones numerous, in a rose- 

 like tuft, mostly stalked ; those of the stem alternate, ses- 

 sile, or clasping, and smaller. Puhescence simple or forked. 

 PL in corymbose clusters, white, seldom reddish. Pods 

 in very long clusters. Species numerous, chiefly natives 

 of the northern hemisphere. 



1. K.thaliana. Common Wall-cress. 



Leaves hairy, more or less toothed ; radical ones stalked, 

 oblong. Stamens not much shorter than the petals. Stem 

 branched. Pods pointing upwards. 



A.thaliana. Lm».% PL 929. friZW.r. 3.535. H. Br. 7 12. Engl. 



Bot. V. 13. <. 901. Curt. Lond.fasc. 2. t. 49. Hook. Scot. I 99. 



DeCand. Sijst.v. 2.226. Pollich v. 2.243. t. 4. Fl. Dan. t.l]06. 

 A. n.452, a. Hall. Hist. v. 1. 197. 

 Pilosella siliquata. Thai. Hercyn. 84. t. 7.f. D. 

 Turritis vulgaris ramosa. Tourn. Inst. 224. RaiiSyn.294. Llnd. 



Alsal. 36. t. 1. 

 Bursa pastoris, sive Pilosella siliquosu Bank. Hist. r. 2. 870./. 



VOL. in. P 



