BRASSICACEAE. 155 



Sisymbrium Nasturtium-aquaticum L., WATER-CRESS, European, is occa- 

 sionally grown in tanks or pools as a vegetable. Lefroy records it as in his 

 time abundant in the water channels of Pembroke Marsh, but recent collectors 

 have failed to find it there, and it probably disappeared after this marsh was 

 made brackish by opening a drainage canal from it westward to the salt water, 

 through which the sea has access to the marsh at high tides. [Nasturtium 

 officinale R. Br., Eadicula, Nasturtium-aquaticum Britten & Rendle.] 



Armoracia Armoracia (L.) Cockerell [Nasturtium Armoracia Fries], 

 HORSERADISH, European, is grown in gardens for its large pungent roots. It 

 has large lanceolate upright leaves and conspicuous white flowers. 



Malcolmia maritima (L.) R. Br., VIRGINIAN STOCK, of the Mediterranean 

 region, grown in flower-gardens, is a slightly pubescent annual, 10'-15' high, 

 with oblong, blunt, entire leaves V-2' long, and variously colored, racemose 

 flowers 8"-10" broad, the nearly sessile linear pods 2'-3' long. [Cheiranthus 

 maritimus L.] 



Cheiranthus Cheiri L., WALL-FLOWER, of southern Europe, also a garden 

 flower, is a somewhat pubescent perennial, l-2 tall, with lanceolate, acutish 

 entire leaves, and large, yellow or sometimes purple, racemose flowers, its linear 

 pods stalked. 



Iberis violacea R. Br., CANDYTUFT, origin unknown, annual, about 3' high, 

 with spatulate toothed leaves, and corymbose purple flowers, is recorded by 

 Lefroy as naturalized on St. George's Island growing along roadsides and in 

 waste places. It is also mentioned by H. B. Small. 



Iberis amara L., WHITE ANNUAL CANDYTUFT, European, a low annual 

 with white or purplish corymbose flowers, the inflorescence elongating and 

 becoming racemose in fruit, the pods 2-lobed, is grown in flower-gardens. 



Iberis umbellata L., PURPLE ANNUAL CANDYTUFT, of southern Europe, an 

 annual up to 18' high, with corymbose purplish or violet flowers, the clusters of 

 sharply 2-lobed pods also corymbose, not elongating, is also grown in flower- 

 gardens. 



Arabis alpina L., ALPINE ROCK-CRESS, of high boreal regions, was seen 

 at Paget Rectory in 1914, where it had been growing for several years. It is 

 a low perennial, with tufted obovate or spatulate, dentate, obtuse, finely 

 stellate-pubescent leaves l'-21' long, the white, often double, flowers racemose, 

 the linear flat pods about 1' long. 



Alyssum saxatile L., GOLDEN-TUFT, European, a whitish-tomentulose 

 perennial with slender stems about 1 high, the lanceolate or oblanceolate, 

 nodulate-margined leaves l'-2J' long, the small, bright yellow flowers in 

 terminal racemes, was seen at Paget Rectory in 1914. 



Camelina sativa (L.) Crantz, FALSE FLAX, European, annual, glabrous, 

 l-2 high, with lanceolate, sometimes sagittate leaves l'-3' long, small, yel- 

 low, racemose flowers, the obovoid, slender-pedicelled pods about 3" broad, their 

 valves convex, has been collected as a waif. [Myagrum sativum L.j 



