CRUCIFERAE 153 



20. ALYSSUM L. 

 1. Alyssum alyssoides (L.) Gouan. Yeli^ow or Smai,l Alyssum. 

 (Man. p. 466 ; I. F. /. 1787.) In fields, Ont. to N. J. and Iowa. Also in 

 the far West. Nat. or adv. from Eu. — Pe7insylvania : Pike ; North- 

 ampton ; Allegheny. 



21. KONIGA Adans. 



1. Konlga maritima (L.) R.Br. SwEET Alyssum. (Man. p. 466; I. 

 F. f. 1/8S.) In waste places, escaped. Adv. from Eu. — Pennsylvania : 

 Northampton ; Lancaster. 



22. BERTEROA DC. 



1. Berteroa incana (L.) DC. Hoary Alyssum. (Man. p. 466; I. 

 F. /. ijSg.) In waste places, Me. to Mass., N. J. and Mo. Adv. or nat. 

 from Eu. — Pennsyli'ania : Philadelphia, ballast. 



23. DRABA L. 



Petals 2-cleft : pods elliptic to oblong-elliptic. i. D. verna. 



Petals entire : pods linear. 2. D. CaroUniana. 



1. Draba vema L. Vernal Whitlow-grass. (Man. p. 460 ; I. F. 

 f. 1735.) In fields, throughout northern U. S. Nat. from Eu. Also in 

 B. C. — Pennsylvania : Northampton ; Bucks ; Lancaster ; Dela- 

 ware ; Chester ; Allegheny. 



2. Draba Caroliniana Walt. Carolina Whitlow-grass. (Man. p. 

 460; I. F. /. 1736.) In sandy fields, Mass. to Ont., Minn., Ga. and Ark. 

 — Pennsylvania : Bucks ; Lancaster. 



24. CARDAMINE L. 



Leaf-blades, at least those of cauline leaves, pinnately divided. 

 Stems scape-like : leaves basal or mainly so. i. C. hirsiita. 



Stems leafy. 

 Pods erect, less than i mm. broad. 

 Corolla 4 mm. wide or broader. 

 Sepals about 2 mm. long. 

 Sepals about i mm. long. 

 Corolla 3 mm. wide or narrower. 

 Pods spreading or ascending, over i mm. broad. 

 Leaf-blades entire or undulate. 

 Stems erect from a tuberous base. 

 Corolla purple. 

 Corolla white. 

 Stems decumbent from a creeping base. 



1. Cardamine hirsuta L. Hairy Bitter-cress. (Man. p. 454 ; I. 

 F. /. 1723. ) In moist places, Pa. to Mich, and N. C. Also in Eu. and 

 Asia. — Pennsylvania : York, above Wrightsville. 



2. Cardamine Pennsylvanica Muhl. Pennsylvania Bitter-cress. 

 (Man. p. 454 ; I. F.y. 1726.) In swamps and wet places, Newf. to Minn., 

 Fla., Tenn. and Mo. — Pen?isylvania : Monroe ; Northampton ; Bucks ; 

 Franklin ; Lebanon; Sullivan; Clarion ; Delaware; Allegheny. 



