496 



Cruciferae 



Nasturtium 



50 



Map 1020 



Armoracea rusticana Gaertn. 



50 



Map 1021 



Armoracia aquatica (Eaton) Wieg. 



o 50 



Map 1022 



Cardamine bulbosa (SchrebJ BSP. 



2965 A. NASTURTIUM R. Br. 



1. Nasturtium officinale R. Br. (Radicula Nasturtium-aquaticum 

 (L.) Britten & Rendle of Gray, Man., ed. 7 and Sisymbrium Nasturtium- 

 aquaticum L. of Britton and Brown, Illus. Flora, ed. 2.) Watercress. Map 

 1019. Infrequent to rare in the glaciated area of the state, becoming rare 

 or absent south of this area. It is found in the outlets of springs and in 

 ditches and small streams which are fed by springs. Where it is found 

 it is generally very abundant, often forming a complete stand over the 

 entire surface of the water. This is the culinary watercress. 



Nat. of Eurasia. 



2965B. ARMORACIA Gaertn. 



Pods short-oblong to subglobose, 2-celled; styles about 0.5 mm long; plant terrestrial, 

 8-12 dm high, partially aquatic when growing in ditches when the lower leaves 

 become much dissected; basal leaves with blades 1-3 dm long; cauline leaves long 

 and sinuate or crenate 1. A. rusticana. 



Pods short-oblong, generally 5-7 mm long, 1-celled; styles 2-3 mm long; plant aquatic, 

 the emersed part usually less than 6 dm long, submerged leaves capillary-dis- 

 sected; cauline leaves elliptic or oblong, rarely more than 1.5 cm broad, early 

 deciduous 2. A. aquatica. 



1. Armoracia rusticana Gaertn. (Radicula Armoracia (L.) Rob. 

 and Armoracia Armoracia (L.) Britt.) Horseradish. Map 1020. Much 

 planted and used as a condiment. It has sparingly escaped from cultivation 

 to ditches and banks of the smaller streams throughout the state. I once 

 found it on the bank of a pond in a clearing. I have never seen it mature 

 seed. 



Nat. of Eu. and widely spread throughout e. N. A. 



2. Armoracia aquatica (Eaton) Wieg. (Rhodora 27: 186. 1925.) 



(Radicula aquatica (Eaton) Rob. and Neobeckia aquatica (Eaton) Britt.) 

 Map 1021. In stagnant water in ponds and bayous of streams and lakes. 

 Very local but probably found in suitable habitats in many counties. 

 Que. and Vt. to Minn., southw. to Fla., La., and Ark. 



