Arabia.] CRUCIFEBjE. ^ 



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, 

 te/ete-4-angled, acuminate. Br. in Hort. Kew. ed. 2. v. iv. p. 

 109. Br. Fl. 1. p. 304. E. Fl. v. in. p. 198.— Erysimum Bar- 

 barea, Linn. — E. Bot. t. 443. 



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

 about Dublin. Fl. May — Aug. %. — One to two feet high, stout, 

 furrowed and branched, glabrous. Flowers yellow. 



2. B. pracox, 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. iii. p. 199. — Erysimum prcecox, Sm. — E. Bot. 

 t. 1 1 29. 



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 (0=). 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. 1. 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 Derrinane ; 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. hirsida, 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. 213. — 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. Stan rough with spreading hairs, bearing 

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

 Arabis thaliana see Sisymbrium. 



