Arabia. 1 CRUCIFER/E. 



19 



between the shorter filaments. Br. Name, this plant was 

 formerly dedicated to St. Barbara. 



Tetradynamia. Siliquosa. 



1. B. vulgaris, Br. Bitter Winter Cress, yellow Rocket. 

 Lower leaves lyrate, the terminal lobe rounded ; the superior 

 ones obovate, toothed ; often pinnatifid at the base ; pods linear, 

 terete-4-angled, acuminate. Br. in Hort. Kew. ed. 2. v. iv. p. 

 109. Br. FL \.p. 304. E. Fl. v. ui.p. 198. Erysimum Bar- 

 barea, Linn. E. Bot. t. 443. 



Pastures, waste grounds, and hedge banks, frequent. Very common 

 about Dublin. Fl. Ma) 7 Aug. %.. One to two feet high, stout, 

 furrowed and branched, glabrous. Flowers yellow. 



2. B. prcecox, Br. Early Winter Cress. Lower leaves lyrate, 

 upper ones pinnatifid ; segments linear-oblong, entire ; pods li- 

 near, obtuse, compressed. Br. in Hort. Kew. ed. '2, v. iv. p. 

 109. E. Fl. v. \ii. p. 199. Erysimum pr&cox, Sm. E. Bot. 

 t. 1129. 



In a lane near the North Circular-road, F. Whitla, Esq. Fl. 

 April Oct. $ . One to two feet high ; more slender than the last in 

 every part. Flowers smaller ; pods long. 



5. ARABIS. Linn. Rock-cress. 



Pod linear, crowned with the nearly sessile stigma ; valves 

 veiny or nerved. Seeds in one row. Cotyledons accum- 

 bent (Ozz). Cal. erect. Br. So named, because originally 

 an Arabian genus. Tetradynamia. Siliquosa. 



1. A. ciliata, Br. Fringed Rock-cress. Leaves somewhat 

 toothed, oval, glabrous, ciliated ; radicle ones nearly sessile, ob- 

 tuse ; those of the stem semiamplexicaul ; stem simple. Br. in 

 Hort. Kew. ed. 2. v. iv. p. 107. Br. Fl. I. p. 303. Fl. v. iii. 

 p. 212. Turvitis alpina, Linn. E. Bot. t. 1746. 



Gravelly beach by the sea-shore at Rynville, Cunnamara, in Oct. 

 1805. On the western point of Bear Island, County of Kerry, and 

 on the shore at Deri-inane ; Mr. J. Drummond. Fl. July, Aug. $ . 

 Four to six inches high. Root-leaves several, oval, or obovato-oblong, 

 obtuse, cauline ones small. Pods nearly erect. 



2. A. hirsuta, Br. Hairy Tower-mustard. Leaves all his- 

 pid, dentate, cauline ones semiamplexicaul ; pods straight. Br. 

 in Hort. Kew. ed. 2. v. iv. p. 107. Br. Fl. 1. p. 303. E. Fl. 

 v. iii. p. 2l3.Turritis hirsuta, Linn. E. Bot. t. 587. 



Walls and calcareous rocks. On the stone roof of St. Doulagh's 

 Church, and church-yard wall. Rocks at Feltrum ; also on rocks near 

 Corrofin, County of Clare, and other places. Fl. June. $ . One foot 

 or more high, erect, stiff. JStem rough with spreading hairs, bearing 

 many leaves. Flowers small, white. Pods numerous, erect. For 

 Arabis thaliana see Sisymbrium. 



