Nasturtium.] CRUCIFER^. 1 7 



rarely suffruticose plants. Leaves alternate. Flowers in corymbs 

 or racemes. 



The universal character of Cruciferse is to possess antiscor- 

 butic and stimulent qualities, combined with an acrid flavour. 



SUBORDER PLEURORHIZE^E. De Cand. Q = 



Cotyledons flat, accumbent. Radicle lateral. Seeds compressed. 



Tribe I. Arabidece. De Cand. 



Siliqua dehiscent ; septum linear, somewhat broader than the seeds. 

 Seeds oval, compressed, often bordered. Cotyledons flat, accumbent, 

 parallel with the septum. De Cand. 



1. MATTHIOLA. R. Brown. Stock. 



Pod rounded or compressed, crowned with the connivent, two 

 lobed stigma, the lobes either thickened at the back, when the 

 cotyledons are incumbent (Q II )> or with a point at the base. 

 Cal. erect. Longer filaments dilated. Br. Named in honour 

 of an Italian Physician, Peter Andrew Matthioli. 



Tetradynamia. Siliquosa. 



\. M. sinuata, Br. Great Sea Stock. Stem herbaceous, 

 spreading; leaves downy, lower ones sinuated; pods com- 

 pressed muricated. Br. FL \.p. 307. E. Fl. v. iii.p. 205. 

 Cheiranthus sinuatus, Linn. E. Bot. t. 462. 



In a small island called Straw Island, near the largest island of 

 Arran, 1805. Fl. May Aug. $. Flowers purple, large, fragrant at 

 night. 



2. CHEIRANTHUS. Linn. Wall-flower. 



Pod compressed or two-edged. Cotyledons accumbent (O = )- 

 Cal. erect, opposite leaflets saccate at the base. Stigma 

 placed on a style, two-lobed, the lobes patent or capitate. 

 Br. Name from the Arabic Kheyry, not however originally 

 applied to this genus. Tetradynamia. Siliquosa. 



1. C. Cheiri. Linn. Common Wall-flower. Leaves Lan- 

 ceolate, acute, entire, with bipartite appressed hairs ; pods 

 linear ; lobes of the stigma patent ; stem shrubby. Hook, in 

 Fl. Lond. N. S. t. 147. Br. Fl. 1. p. 307. Cheiranthus frit- 

 ticulosus, Linn. Mant. E. Fl. v. iii. p. 203. E. Bot. t. 1934. 



Old walls and ruins. Fl. April, May. $ . A variety, with larger, 

 more highly coloured, and more flaccid petals, is commonly cultivated 

 in gardens, of which the double bloody wall-flower is a variety. 



3. NASTURTIUM. Br. Cress. 



Pod nearly cylindrical, sometimes short. Valves concave, 



B 



