CRUCIFERjE 113 



Plate 59. 

 TURRITIS, Tourn., Dill. 



Semina in lociilis biserialia. Caetera omnia Arabidis. 



Tukritis, Tourn. (excl. spec.) Dillen. Nov. Gen. p. 120. t. 6. Gcertn. 

 Fr. t. 143. R. Br. in Ait. Kew. 1. c. (excl. spec.) DC. Syst. 2. 

 p. 213. (excl. spec.) C. A. Meyer, in Ledeb. FI. Alt. 3. p. 13. 

 Hook. Fl. Bor.-Am. 1. p. 40. Torr. & Gray, Fl. N. Am. 1. p. 

 78. Endl. Gen. 4853. 



Tower-Mustard. 



Calyx loosely erect ; the sepals equal at the base, or the 

 lateral gibbous. Petals spatulate, linear-oblong, or obovate, 

 the claw plane. Filaments filiform, toothless : anthers 

 oblong-linear or sagittate. Ovary linear : style very short 

 or none : stigma capitate. Ovules very numerous, forming 

 two rows in each cell. 



Siliqjje linear, elongated, not stipitate, flattened or com- 

 pressed-quadrangular, two-valved ; the valves one-nerved in 

 the middle, nearly flat or somewhat carinate : partition des- 

 titute of a midnerve, formed of oblong-linear and irregular 

 areola? bounded by exceedingly tortuous lines. Seeds very 

 numerous on both placentae, forming two rows in each cell, 

 pendulous on filiform free funiculi, smooth, oval, compress- 

 ed, marginless, or surrounded by a winged margin. Em- 

 bryo, &c, as in Arabis. 



Herbs, chiefly with biennial or annual roots, and virgate 

 leafy stems ; the radical leaves spatulate and often toothed ; 

 the cauline sessile or partly clasping by a sagittate or auricu- 

 late base, lanceolate or oblong, chiefly entire. Raceme elon- 

 gated in fruit, ebracteate. Petals white (the calyx yellow- 

 ish) or purple. 



Etymology. An early name, from turris, a tower, of uncertain application. 

 Geographical Distribution, &c. Tins genus, as now received, con- 



