The Flora of the Cayuga Lake Basin 231 



This plant resembles larger forms of Cardamine pennsylvanica, but the pods spread 

 at right angles, and are broader and more curved. 



16. Armoracia Gaertn. 



a. Pod globose, 2-celled; style very short; plant terrestrial, with large leaves, the 

 lowermost ones often dissected. 1. A. rusticana 



a. Pod ovoid, 1 -celled; style about as long as the pod; plant aquatic, with submerged 

 capillary-dissected leaves. 2. A. aquatica 



1. A. rusticana Gaertn. (Radicula Armoracia of Gray's Man., ed. 7. Nasturtium 



Armoracia of Cayuga Fl.) Horse-radish. 



Low grounds and ditches, in rich soils ; frequent. May-June. 



Roadside, South Hill to Danby ; Inlet Valley, near Enfield Creek; flats s. and n. 

 of Ithaca; waste places in Ithaca; and elsewhere. 



Widespread in e. N. A., where it is naturalized from Eu. It was probably intro- 

 duced originally because of its value as a condiment. 



2. A. aquatica (Eaton) Wiegand. (See Rhodora 27: 186. 1925. Radicula aquatica 



of Gray's Man., ed. 7.) Lake Cress. 

 Shallow water ; rare. June 25-July. 



Known only from Black Brook, tyre (K. M. W ., A. J. E., & L. F. Randolph). 

 Que. and Vt. to Minn., southw. to Fla., La., and Ark.; rare or absent on the 

 Coastal Plain. 



17. Barbarea R. Br. 



a. Lateral divisions of the lower leaves 0-4 (5) pairs, the upper leaves rarely pin- 

 natifid; beak slender, 2-3 mm. long; pedicels slender. 1. B. vulgaris 



a. Lateral divisions of the lower leaves (4) 5-10 pairs, the upper leaves lyrate ; beak 

 stout, 0.5-1 (2) mm. long; pedicels as thick as the pod. 2. B. verna 



1. B. vulgaris R. Br. Winter Cress. Yellow Rocket. Spring Mustard. 



A weed in rich damp cultivated fields, on roadsides, and in waste places, in loamy, 

 gravelly, or clayey soils ; very common, often rendering whole fields bright yellow. 

 May-June. 



Widely distributed in N. A. Introduced from Europe in the Eastern and Central 

 States, but native in the North and West. 



In exposed situations the pods are usually appressed (B. stricta of Gray's Man., 

 ed. 7, not Andrz. B. vulgaris, var. longisiliquosa Fernald, Rhodora 11:139, 1909, 

 and of Carion?), but when growing in the shade or in especially damp situations, the 

 pods are commonly much more spreading. (See Journ. Bot. 54:202, 1916, and 

 57:304, 1919.) 



2. B. verna (Mill.) Asch. 



In situations and soils similar to the preceding, or possibly in more sandy or 

 gravelly subacid soils ; scarce. May 10-June 15. 



Near Key Hill ; Caroline ; railroad ballast w. and e. of Aurora St. on South Hill, 

 Ithaca; C. U. campus, near baseball cage; Cayuga Heights; Central N. Y. Southern 

 R. R., near Remington Salt Works. 



N. Y. to Wash., southw. to Fla. and Calif. Native of Eu. 



Originally perhaps an escape from cultivation, where it is infrequently grown for 

 salad. 



18. Lunaria L. 



1. L. annua L. (L. biennis of Cayuga Fl.) Honesty. 



Springing up occasionally near old gardens; doubtfully established. May 15-30. 

 Ithaca, near foot of State St. hill and on Dryden Road ; " by hedge south side of 



