CLASS XV. ORDER II.] TDRRITIS. 905 



5. A. TurrVta, Linn. (Fig. 1045.) Toiver Wall-cress. Stem erect, 

 downy ; leaves oblong, downy, the radical ones peliolated, the upper 

 sessile, cordate, amplexicaul ; pedicles long ; siliqua long, flat, com- 

 pressed, with thickened margins ; seeds flat, with a narrow membranous 

 margin. 



English Botany, t. 178.— English Flora, vol. iii. p. 214.— Hooker, 

 British Flora, ed. 4. vol. i. p. 252. — Lindley, Synopsis, p. 24. 



Jioot tapering. Stem erect, from one to two feet high, round, more 

 or less clothed with close soft starry pubescence, simple, rarely branched, 

 leafy. Leaves a pale green, more or less clothed with soft close 

 pubescence, especially beneath, the radical leaves oblong, ovale, taper- 

 ing into a footstalk, the margins somewhat recurved, and unequally 

 toothed, those of the stem elliptic, ovate, deeply cordate at the base, 

 sessile, the lobes embracing the stem, plane, and unequally toothed. 

 Inflorescence a terminal sub-corymbose raceme, becoming much 

 elongated, the pedicles short, arising from the bosom of a leafy hractea. 

 Calyx of four oblong pieces. Corolla pale sulphur coloured, broadly 

 ovate, tapering into a claw, the limb spreading. Filaments with four 

 small ovale glands at the base. Stigma small, obtuse, nearly sessile. 

 Fruit a recurved siliqua, compressed with a thickened margin about 

 four inches long, smooth. Seeds numerous, flat, pale brown, with a 

 narrow membranous margin. 



Habitat. — Walls of Trinity and St. John's Colleges, Cambridge, and 

 Magdalen College, Oxford ; Cleith Castle, Kinross, Scotland. 



Biennial; flowering in May. 



This rare and probably introduced species of Arabis we find common 

 amongst rocks in shady places in the mountainous districts of Italy, 

 where — 



" Oft have I wandering seen strange characters 

 Of beauty lodged within an insect's wing, 

 Or 'neath a spurn'd weed's close enveloping; 

 Hid within modest Nature's secret bars, 

 (Like a blue night with all its silver stars), 

 A bright wild world ol order and whole spring 

 Of colourings. Such to sight God's presence bring ; 

 In the least thing which nature makes and mars, 

 He builds a temple !" 



Thoughts in Past Fears. 



GENUS XXI. TURRrTIS,-.LiNN. Tower Mustard. 



Nat. Ord. Crucjf'er^. Juss. 



Gen. Char. Siliqua linear, with ribbed or keeled valves. Stigma 

 obtuse, entire, or slightly emarginaled. Seeds in a double row. 

 Cotyledons accumbent.— (See Fig. 1, p. 871.)— Name from turrisy 

 a toiver ; from the somewhat pyramidal form of the plant. 



